1
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Anyfanti G, Husanu E, Andrusenko I, Marchetti D, Gemmi M. The crystal structure of olanzapine form III. IUCRJ 2024; 11:843-848. [PMID: 39072705 PMCID: PMC11364035 DOI: 10.1107/s2052252524007383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Accepted: 07/24/2024] [Indexed: 07/30/2024]
Abstract
The antipsychotic drug olanzapine is well known for its complex polymorphism. Although widely investigated, the crystal structure of one of its anhydrous polymorphs, form III, is still unknown. Its appearance, always in concomitance with forms II and I, and the impossibility of isolating it from that mixture, have prevented its structure determination so far. The scenario has changed with the emerging field of 3D electron diffraction (3D ED) and its great advantages in the characterization of polyphasic mixtures of nanosized crystals. In this study, we show how the application of 3D ED allows the ab initio structure determination and dynamical refinement of this elusive crystal structure that remained unknown for more than 20 years. Olanzapine form III is monoclinic and shows a similar but shifted packing with respect to form II. It is remarkably different from the lowest-energy structures predicted by the energy-minimization algorithms of crystal structure prediction.
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Affiliation(s)
- Goulielmina Anyfanti
- Electron CrystallographyIstituto Italiano di Tecnologia (ITT)Viale Rianaldo Piaggio 34Pontedera56025Italy
| | - Elena Husanu
- Electron CrystallographyIstituto Italiano di Tecnologia (ITT)Viale Rianaldo Piaggio 34Pontedera56025Italy
| | - Iryna Andrusenko
- Electron CrystallographyIstituto Italiano di Tecnologia (ITT)Viale Rianaldo Piaggio 34Pontedera56025Italy
| | - Danilo Marchetti
- Electron CrystallographyIstituto Italiano di Tecnologia (ITT)Viale Rianaldo Piaggio 34Pontedera56025Italy
- Department of ChemistryUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Mauro Gemmi
- Electron CrystallographyIstituto Italiano di Tecnologia (ITT)Viale Rianaldo Piaggio 34Pontedera56025Italy
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2
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Sakakibara M, Nakamuro T, Nakamura E. Kinetic Exploration of Nanoscale Polymorphs through Interface Energy Adjustment. ACS NANO 2024; 18:22325-22333. [PMID: 39117583 DOI: 10.1021/acsnano.4c06618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Traditionally, the study of crystal polymorphism has relied on thermodynamics and measurements averaged over time and the crystal's constituents. This work introduces a kinetic approach to phase identification─millisecond cinematographic electron microscopic imaging of the dynamics of phase transitions of crystals of a few nm in diameter. We demonstrate a remarkable impact of the interface energy on the relative stability of the nanocrystal's polymorphs, enabling in situ manipulation of phase transitions through size increase or decrease. Starting with the B1 NaI polymorph at 298 K, we identified the previously unknown B2 polymorph of a 1 s lifetime upon sublimation of the crystal. From the CsCl liquid phase, we produced the B1 phase, previously described only at 749 K.
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Affiliation(s)
- Masaya Sakakibara
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Takayuki Nakamuro
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Eiichi Nakamura
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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3
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Wang C, Ma CY, Hong RS, Turner TD, Rosbottom I, Sheikh AY, Yin Q, Roberts KJ. Influence of Solvent Selection on the Crystallizability and Polymorphic Selectivity Associated with the Formation of the "Disappeared" Form I Polymorph of Ritonavir. Mol Pharm 2024; 21:3525-3539. [PMID: 38900600 PMCID: PMC11220793 DOI: 10.1021/acs.molpharmaceut.4c00234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 06/01/2024] [Accepted: 06/03/2024] [Indexed: 06/22/2024]
Abstract
The comparative crystallizability and polymorphic selectivity of ritonavir, a novel protease inhibitor for the treatment of acquired immune-deficiency syndrome, as a function of solvent selection are examined through an integrated and self-consistent experimental and computational molecular modeling study. Recrystallization at high supersaturation by rapid cooling at 283.15 K is found to produce the metastable "disappeared" polymorphic form I from acetone, ethyl acetate, acetonitrile, and toluene solutions in contrast to ethanol which produces the stable form II. Concomitant crystallization of the other known solid forms is not found under these conditions. Isothermal crystallization studies using turbidometric detection based upon classical nucleation theory reveal that, for an equal induction time, the required driving force needed to initiate solution nucleation decreases with solubility in the order of ethanol, acetone, acetonitrile, ethyl acetate, and toluene consistent with the expected desolvation behavior predicted from the calculated solute solvation free energies. Molecular dynamics simulations of the molecular and intermolecular chemistry reveal the presence of conformational interplay between intramolecular and intermolecular interactions within the solution phase. These encompass the solvent-dependent formation of intramolecular O-H...O hydrogen bonding between the hydroxyl and carbamate groups coupled with differing conformations of the hydroxyl's shielding phenyl groups. These conformational preferences and their relative interaction propensities, as a function of solvent selection, may play a rate-limiting role in the crystallization behavior by not only inhibiting to different degrees the nucleation process but also restricting the assembly of the optimal intermolecular hydrogen bonding network needed for the formation of the stable form II polymorph.
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Affiliation(s)
- Chang Wang
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
- School
of Chemical Engineering and Technology, State Key Laboratory of Chemical
Engineering, Tianjin University, Tianjin 300072, China
| | - Cai Y. Ma
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
| | - Richard S. Hong
- Molecular
Profiling and Drug Delivery, Research and Development, AbbVie Inc, North Chicago, Illinois 60064, United States
| | - Thomas D. Turner
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
| | - Ian Rosbottom
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
| | - Ahmad Y. Sheikh
- Molecular
Profiling and Drug Delivery, Research and Development, AbbVie Inc, North Chicago, Illinois 60064, United States
| | - Qiuxiang Yin
- School
of Chemical Engineering and Technology, State Key Laboratory of Chemical
Engineering, Tianjin University, Tianjin 300072, China
| | - Kevin J. Roberts
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
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4
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Menon AM, Sidhartha NN, Shruti I, Suresh A, Meena R, Dikundwar AG, Chopra D. Synthon Approach in Crystal Engineering to Modulate Physicochemical Properties in Organic Salts of Chlorpropamide. Mol Pharm 2024; 21:2894-2907. [PMID: 38688017 DOI: 10.1021/acs.molpharmaceut.4c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
The formulation of drug with improved bioavailability is always challenging and indispensable in the field of pharmaceutics. The control of intermolecular interactions via crystal engineering approach and solid-state molecular recognition results in the formation of active drug molecules with modulated pharmacological benefits. Therefore, with the aim to improve the solubility and dissolution rate of the drug chlorpropamide (CPA), the mechanochemical liquid-assisted grinding (LAG) of the drug with several pharmaceutically accepted excipients was performed. This contributed to the discovery of six novel solid phases, namely salts, salt cocrystals and salt cocrystal hydrate─the salt of CPA with 3, 4-diaminopyridine (DAP); salt and salt cocrystal (SC) polymorph (Z″=3) with 1, 4-diazabicyclo [2.2.2] octane (DABCO); a salt, SC polymorph (Z″=9), and a SC hydrate (Z″=9) with piperazine (PIP). The formation of these salts and salt cocrystals are mainly guided by the strong hydrogen bonds with tunable strength having high electrostatic contribution. This attractive interaction brings the donor and the acceptor atoms close to each other for a facile proton transfer. Furthermore, the conformational constraints on the drug molecules, provided by the excipients via strong and directional hydrogen bonds, are quite impressive as this leads to the identification and characterization of "new conformational isomers" for the CPA molecules. The new crystalline phases exhibit enhanced intrinsic dissolution rate in comparison to that of the pure drug, the magnitude being 7, 131, and 120 folds for CPADAP, CPADABCO_II, and CPAPIP_III, respectively. Furthermore, it is interesting to note that the order of solubility is enhanced by 2.7-, 3-, and 7-fold, respectively, for the abovementioned salts. This also mirrors the trends in the magnitude of the binding energy, the higher magnitude being reflected in the lower solubility. Additionally, the in vivo experiments performed in SD rats results in the enhancement of the magnitude of the pharmacokinetic properties, when compared to the pristine drug. The concentration of the drug in CPADABCO_II and CPAPIP_III formulations exhibits 6- and 4-fold increments, respectively. Indeed, these results corroborate to the trends observed in the structural characterization, intermolecular energy calculations, solubility, and in vitro dissolution assessments.
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Affiliation(s)
- Anila M Menon
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462066, India
| | - Nagamalli Naga Sidhartha
- Department of Pharmaceutical Analysis, NIPER Hyderabad, Balanagar, Hyderabad, Telangana 500037, India
| | - Ipsha Shruti
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462066, India
| | - Ajay Suresh
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462066, India
| | - Ravindra Meena
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462066, India
| | - Amol G Dikundwar
- Department of Pharmaceutical Analysis, NIPER Hyderabad, Balanagar, Hyderabad, Telangana 500037, India
| | - Deepak Chopra
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462066, India
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5
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Dittrich B, Connor LE, Fabbiani FPA, Piechon P. Linking solid-state phenomena via energy differences in `archetype crystal structures'. IUCRJ 2024; 11:347-358. [PMID: 38629168 PMCID: PMC11067740 DOI: 10.1107/s2052252524002641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 03/20/2024] [Indexed: 05/04/2024]
Abstract
Categorization underlies understanding. Conceptualizing solid-state structures of organic molecules with `archetype crystal structures' bridges established categories of disorder, polymorphism and solid solutions and is herein extended to special position and high-Z' structures. The concept was developed in the context of disorder modelling [Dittrich, B. (2021). IUCrJ, 8, 305-318] and relies on adding quantum chemical energy differences between disorder components to other criteria as an explanation as to why disorder - and disappearing disorder - occurs in an average structure. Part of the concept is that disorder, as probed by diffraction, affects entire molecules, rather than just the parts of a molecule with differing conformations, and the finding that an R·T energy difference between disorder archetypes is usually not exceeded. An illustrative example combining disorder and special positions is the crystal structure of oestradiol hemihydrate analysed here, where its space-group/subgroup relationship is required to explain its disorder of hydrogen-bonded hydrogen atoms. In addition, we show how high-Z' structures can also be analysed energetically and understood via archetypes: high-Z' structures occur when an energy gain from combining different rather than overall alike conformations in a crystal significantly exceeds R·T, and this finding is discussed in the context of earlier explanations in the literature. Twinning is not related to archetype structures since it involves macroscopic domains of the same crystal structure. Archetype crystal structures are distinguished from crystal structure prediction trial structures in that an experimental reference structure is required for them. Categorization into archetype structures also has practical relevance, leading to a new practice of disorder modelling in experimental least-squares refinement alluded to in the above-mentioned publication.
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Affiliation(s)
- B. Dittrich
- Novartis Campus, Novartis Pharma AG, Postfach, Basel CH-4002, Switzerland
- Mathematisch Naturwiss. Fakultät, Universität Zürich, Winterthurerstrasse 190, Zürich CH-8057, Switzerland
| | - L. E. Connor
- Novartis Campus, Novartis Pharma AG, Postfach, Basel CH-4002, Switzerland
| | - F. P. A. Fabbiani
- Novartis Campus, Novartis Pharma AG, Postfach, Basel CH-4002, Switzerland
| | - P. Piechon
- Novartis Campus, Novartis Pharma AG, Postfach, Basel CH-4002, Switzerland
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6
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Bu G, Danelius E, Wieske LH, Gonen T. Polymorphic Structure Determination of the Macrocyclic Drug Paritaprevir by MicroED. Adv Biol (Weinh) 2024; 8:e2300570. [PMID: 38381052 PMCID: PMC11090733 DOI: 10.1002/adbi.202300570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/20/2023] [Indexed: 02/22/2024]
Abstract
Paritaprevir is an orally bioavailable, macrocyclic drug used for treating chronic Hepatitis C virus (HCV) infection. Its structures have been elusive to the public until recently when one of the crystal forms is solved by microcrystal electron diffraction (MicroED). In this work, the MicroED structures of two distinct polymorphic crystal forms of paritaprevir are reported from the same experiment. The different polymorphs show conformational changes in the macrocyclic core, as well as the cyclopropyl sulfonamide and methyl pyrazinamide substituents. Molecular docking shows that one of the conformations fits well into the active site pocket of the HCV non-structural 3/4A (NS3/4A) serine protease target, and can interact with the pocket and catalytic triad via hydrophobic interactions and hydrogen bonds. These results can provide further insight for optimization of the binding of acyl sulfonamide inhibitors to the HCV NS3/4A serine protease. In addition, this also demonstrates the opportunity to derive different polymorphs and distinct macrocycle conformations from the same experiments using MicroED.
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Affiliation(s)
- Guanhong Bu
- Department of Biological Chemistry, University of California Los Angeles, 615 Charles E. Young Drive South, Los Angeles, CA 90095, USA
| | - Emma Danelius
- Department of Biological Chemistry, University of California Los Angeles, 615 Charles E. Young Drive South, Los Angeles, CA 90095, USA
- Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Lianne H.E. Wieske
- Department of Chemistry – BMC, Uppsala University, Husargatan 3, 75237 Uppsala, Sweden
| | - Tamir Gonen
- Department of Biological Chemistry, University of California Los Angeles, 615 Charles E. Young Drive South, Los Angeles, CA 90095, USA
- Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
- Department of Physiology, University of California Los Angeles, 615 Charles E. Young Drive South, Los Angeles, CA 90095, USA
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7
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Terlecki M, Kornowicz A, Sacharczuk K, Justyniak I, Lewiński J. Synthesis, polymorphism, and shape complementarity-induced co-crystallization of hexanuclear Co(II) clusters capped by a flexible heteroligand shell. Dalton Trans 2024; 53:7012-7022. [PMID: 38563241 DOI: 10.1039/d4dt00261j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Polymorphism and co-crystallization have gradually gained attention as new tools in the development of modern crystalline functional materials. However, the study on the selective self-assembly of metal clusters into multicomponent crystals is still in its infancy. Herein, we present the synthesis and characterization of two new heteroleptic hydroxido-acetato and acetato Co(II) clusters [Co6(OH)2(OAc)4(pyret)6] (1) and [Co6(OAc)6(pyret)6] (2) incorporating auxiliary 2-pyrrolidinoethoxylate (pyret) ligands. On this occasion, we revealed that the commonly used thermal procedure for dehydration of cobalt(II) acetate leads to a reagent comprising substantial contamination by cobalt hydroxido moieties. Comprehensive structural analysis of new compounds demonstrated intriguing crystal structure diversity of hydroxido-acetato cluster 1, which represents a rare example of both conformational and packing polymorphism in one compound, originating from the flexibility of organic O,N-ligands in the secondary coordination sphere. Furthermore, both clusters exhibit an interesting propensity for the selective formation of co-crystals 1·2 driven mainly by van der Waals forces and specific shape complementarity between co-formers.
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Affiliation(s)
- Michał Terlecki
- Faculty of Chemistry, Warsaw University of Technology, Noakowsiego 3, 00-664 Warsaw, Poland.
| | - Arkadiusz Kornowicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Kornel Sacharczuk
- Faculty of Chemistry, Warsaw University of Technology, Noakowsiego 3, 00-664 Warsaw, Poland.
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Lewiński
- Faculty of Chemistry, Warsaw University of Technology, Noakowsiego 3, 00-664 Warsaw, Poland.
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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8
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Castillo R, Blanco S, López JC. Conformational isomerism in trans-3-methoxycinnamic acid: From solid to gas phase. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 311:123997. [PMID: 38335592 DOI: 10.1016/j.saa.2024.123997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 01/30/2024] [Accepted: 02/03/2024] [Indexed: 02/12/2024]
Abstract
The rotational spectrum of laser ablated trans-3-methoxycinnamic acid has been observed in the 2-8 GHz range using chirped-pulse Fourier transform microwave spectroscopy coupled to a supersonic jet and adapted to support a laser ablation vaporization system (LA-CP-FTMW). Eight stable conformers were theoretically predicted to exist at B3LYP-D3BJ/6-311++(2d,p) level, all of which were experimentally detected. The experimental rotational parameters data evidence the essentially planar structures for all the conformers. The relative population distribution of conformers in the supersonic jet was investigated from relative intensity measurements. Cooling in the jet brings rotational temperatures close to 1 K for all the conformers. The theoretical predictions for the rotational constants and electric dipole moments show good agreement with the experimental constants and selection rules observed. The population distribution of conformers in the supersonic jet was found to be close to the equilibrium distribution calculated at temperatures lower than the stagnation temperature. Finally, the correlation of the observed conformers structures with those found in condensed phases was investigated.
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Affiliation(s)
- Roger Castillo
- Departamento de Química Física y Química Inorgánica, IU CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain
| | - Susana Blanco
- Departamento de Química Física y Química Inorgánica, IU CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain
| | - Juan Carlos López
- Departamento de Química Física y Química Inorgánica, IU CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain.
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9
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Sacchi P, Wright SE, Neoptolemou P, Lampronti GI, Rajagopalan AK, Kras W, Evans CL, Hodgkinson P, Cruz-Cabeza AJ. Crystal size, shape, and conformational changes drive both the disappearance and reappearance of ritonavir polymorphs in the mill. Proc Natl Acad Sci U S A 2024; 121:e2319127121. [PMID: 38557191 PMCID: PMC11009673 DOI: 10.1073/pnas.2319127121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/19/2024] [Indexed: 04/04/2024] Open
Abstract
Organic compounds can crystallize in different forms known as polymorphs. Discovery and control of polymorphism is crucial to the pharmaceutical industry since different polymorphs can have significantly different physical properties which impacts their utilization in drug delivery. Certain polymorphs have been reported to 'disappear' from the physical world, irreversibly converting to new ones. These unwanted polymorph conversions, initially prevented by slow nucleation kinetics, are eventually observed driven by significant gains in thermodynamic stabilities. The most infamous of these cases is that of the HIV drug ritonavir (RVR): Once its reluctant form was unwillingly nucleated for the first time, its desired form could no longer be produced with the same manufacturing process. Here we show that RVR's extraordinary disappearing polymorph as well as its reluctant form can be consistently produced by ball-milling under different environmental conditions. We demonstrate that the significant difference in stability between its polymorphs can be changed and reversed in the mill-a process we show is driven by crystal size as well as crystal shape and conformational effects. We also show that those effects can be controlled through careful design of milling conditions since they dictate the kinetics of crystal breakage, dissolution, and growth processes that eventually lead to steady-state crystal sizes and shapes in the mill. This work highlights the huge potential of mechanochemistry in polymorph discovery of forms initially difficult to nucleate, recovery of disappearing polymorphs, and polymorph control of complex flexible drug compounds such as RVR.
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Affiliation(s)
- Pietro Sacchi
- Department of Chemical Engineering, University of Manchester, ManchesterM13 9PL, United Kingdom
- The Cambridge Crystallographic Data Centre, CambridgeCB2 1EZ, United Kingdom
| | - Sarah E. Wright
- Department of Chemical Engineering, University of Manchester, ManchesterM13 9PL, United Kingdom
| | - Petros Neoptolemou
- Department of Chemical Engineering, University of Manchester, ManchesterM13 9PL, United Kingdom
| | - Giulio I. Lampronti
- Department of Earth Sciences, University of Cambridge, CambridgeCB2 3EQ, United Kingdom
| | | | - Weronika Kras
- Department of Chemical Engineering, University of Manchester, ManchesterM13 9PL, United Kingdom
- Chemical Development, Pharmaceutical Technology & Development, AstraZeneca, MacclesfieldSK10 2NA, United Kingdom
| | - Caitlin L. Evans
- Department of Chemistry, Durham University, DurhamDH1 3LE, United Kingdom
| | - Paul Hodgkinson
- Department of Chemistry, Durham University, DurhamDH1 3LE, United Kingdom
| | - Aurora J. Cruz-Cabeza
- Department of Chemical Engineering, University of Manchester, ManchesterM13 9PL, United Kingdom
- Chemical Development, Pharmaceutical Technology & Development, AstraZeneca, MacclesfieldSK10 2NA, United Kingdom
- Department of Chemistry, Durham University, DurhamDH1 3LE, United Kingdom
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10
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Munthasir ATM, Rani P, Dhanalakshmi P, Pradhan S, Thilagar P. Polymorphism Dependent Cytotoxicity, Cellular Uptake, and Live Cell Imaging Studies on Napthalimide-Vinyl-Phenothiazine Conjugate. Chemistry 2024:e202400868. [PMID: 38576402 DOI: 10.1002/chem.202400868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 03/28/2024] [Accepted: 04/02/2024] [Indexed: 04/06/2024]
Abstract
Polymorphism-dependent cytotoxicity and cellular uptake of drug molecules have been studied for the past two decades. However, the visualization of polymorph-dependent cellular uptake and cytotoxicity using microscopy imaging techniques has not yet been reported. The luminescent polymorph is an ideal candidate to validate the above hypothesis. Herein, we report the polymorph-dependent cellular uptake, cytotoxicity, and bio-imaging functions of polymorphs 1Y and 1R of a naphthalimide-phenothiazine dyad. These polymorphs show different luminescence colors in the solid state and exhibit aggregation-induced enhanced emission (AIEE) in the DMSO-Water mixture. Bioimaging, cytotoxicity assay, and fluorescence-activated cell sorting (FACS) studies revealed that these polymorphs show different levels of cytotoxicity, cellular uptake, localization, and imaging potential. Detailed photophysical, morphological, and biological studies revealed that the difference in molecular conformation in these polymorphs enables them to form aggregates of different sizes and morphology, which leads to the differential uptake of these into the cells and consequently shows different cytotoxicity and imaging potentials.
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Affiliation(s)
| | - Poonam Rani
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Bengaluru, India -, 560012
| | - Pandi Dhanalakshmi
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Bengaluru, India -, 560012
| | - Sambit Pradhan
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Bengaluru, India -, 560012
| | - Pakkirisamy Thilagar
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Bengaluru, India -, 560012
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11
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Jozuka W, Kim SH, Matsumoto S. Three polymorphs of a new N,N'-dipropylated isoindigo derivative. Acta Crystallogr C Struct Chem 2024; 80:123-128. [PMID: 38511904 DOI: 10.1107/s2053229624002481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Accepted: 03/15/2024] [Indexed: 03/22/2024] Open
Abstract
A newly synthesized N,N'-dipropyl-substituted isoindigo derivative, namely, 1-propyl-3-(1-propyl-1,2-dihydro-2-oxo-3H-indol-3-ylidene)-1,3-dihydro-2H-indol-2-one, C22H22N2O2, was found to have three polymorphic forms (denoted Forms I, II and III) under various crystallization conditions. Crystal structure analysis indicated that Form III had a significantly different molecular conformation from the other two polymorphs. Their different packing arrangements were correlated with differences in the intermolecular interactions. Thermal measurements revealed that Forms I and II are enantiotropically related, and Form II exhibits thermally dynamic behaviour.
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Affiliation(s)
- Wataru Jozuka
- Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Yokohama 240-8501, Japan
| | - Sung Hoon Kim
- Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Yokohama 240-8501, Japan
| | - Shinya Matsumoto
- Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Yokohama 240-8501, Japan
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12
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Rahman M, Dannatt HRW, Blundell CD, Hughes LP, Blade H, Carson J, Tatman BP, Johnston ST, Brown SP. Polymorph Identification for Flexible Molecules: Linear Regression Analysis of Experimental and Calculated Solution- and Solid-State NMR Data. J Phys Chem A 2024; 128:1793-1816. [PMID: 38427685 PMCID: PMC10945485 DOI: 10.1021/acs.jpca.3c07732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/06/2024] [Accepted: 02/07/2024] [Indexed: 03/03/2024]
Abstract
The Δδ regression approach of Blade et al. [ J. Phys. Chem. A 2020, 124(43), 8959-8977] for accurately discriminating between solid forms using a combination of experimental solution- and solid-state NMR data with density functional theory (DFT) calculation is here extended to molecules with multiple conformational degrees of freedom, using furosemide polymorphs as an exemplar. As before, the differences in measured 1H and 13C chemical shifts between solution-state NMR and solid-state magic-angle spinning (MAS) NMR (Δδexperimental) are compared to those determined by gauge-including projector augmented wave (GIPAW) calculations (Δδcalculated) by regression analysis and a t-test, allowing the correct furosemide polymorph to be precisely identified. Monte Carlo random sampling is used to calculate solution-state NMR chemical shifts, reducing computation times by avoiding the need to systematically sample the multidimensional conformational landscape that furosemide occupies in solution. The solvent conditions should be chosen to match the molecule's charge state between the solution and solid states. The Δδ regression approach indicates whether or not correlations between Δδexperimental and Δδcalculated are statistically significant; the approach is differently sensitive to the popular root mean squared error (RMSE) method, being shown to exhibit a much greater dynamic range. An alternative method for estimating solution-state NMR chemical shifts by approximating the measured solution-state dynamic 3D behavior with an ensemble of 54 furosemide crystal structures (polymorphs and cocrystals) from the Cambridge Structural Database (CSD) was also successful in this case, suggesting new avenues for this method that may overcome its current dependency on the prior determination of solution dynamic 3D structures.
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Affiliation(s)
- Mohammed Rahman
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
| | | | | | - Leslie P. Hughes
- Oral
Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K.
| | - Helen Blade
- Oral
Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K.
| | - Jake Carson
- Mathematics
Institute at Warwick, University of Warwick, Coventry CV4 7AL, U.K.
| | - Ben P. Tatman
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
| | | | - Steven P. Brown
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
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13
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Hartwick CJ, Reinheimer EW, MacGillivray LR. A molecular T-pentomino for separating BTEX hydrocarbons. Nat Commun 2024; 15:2121. [PMID: 38459047 PMCID: PMC10924097 DOI: 10.1038/s41467-024-45542-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 01/23/2024] [Indexed: 03/10/2024] Open
Abstract
Methods to separate molecules (e.g., petrochemicals) are exceedingly important industrially. A common approach for separations is to crystallize a host molecule that either provides an enforced covalent cavity (intrinsic cavity) or packs inefficiently (extrinsic cavity). Here we report a self-assembled molecule with a shape highly biased to completely enclose space and, thereby, pack efficiently yet hosts and allows for the separation of BTEX hydrocarbons (i.e., benzene, toluene, ethylbenzene, xylenes). The host is held together by N → B bonds and forms a diboron assembly with a shape that conforms to a T-shaped pentomino. A T-pentomino is a polyomino, which is a plane figure that tiles a plane without cavities and holes, and we show the molecule to crystallize into one of six polymorphic structures for T-pentomino tiling. The separations occur at mild conditions while rejecting similarly shaped aromatics such as xylene isomers, thiophene, and styrene. Our observation on the structure and tiling of the molecular T-pentomino allows us to develop a theory on how novel synthetic molecules that mimic the structures and packing of polyominoes can be synthesized and-quite counterintuitively-developed into a system of hosts with cavities used for selective and useful separations.
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Affiliation(s)
| | - Eric W Reinheimer
- Rigaku Americas Corporation, 9009 New Trails Drive, The Woodlands, TX, 77381, USA
| | - Leonard R MacGillivray
- Department of Chemistry, University of Iowa, Iowa City, IA, 52242, USA.
- Département de Chimie, Université de Sherbrooke, QC, J1K 2R1, Canada.
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14
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Möbitz H. Design Principles for Balancing Lipophilicity and Permeability in beyond Rule of 5 Space. ChemMedChem 2024; 19:e202300395. [PMID: 37986275 DOI: 10.1002/cmdc.202300395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 10/13/2023] [Accepted: 11/16/2023] [Indexed: 11/22/2023]
Abstract
An ab initio conformational analysis of oral beyond Rule of 5 (bRo5) drugs was complemented with measured permeability and logP(octanol) to derive design principles conferring oral bioavailability. 3D polar surface area (PSA) thresholds for oral bRo5 drugs coincided with those reported for Ro5 space. The majority of oral bRo5 drugs exceeded the Ro5 logP threshold of 5, reflecting a bias for permeability. Above 500 Da molecular weight (MW), oral drugs and highly permeable Novartis compounds occupy a narrow polarity range (topological or TPSA/MW) of 0.1-0.3 Å2 /Da, whose upper half coincides with the lower 90 percentiles of the Novartis logP set. This TPSA/MW range and 3D PSA below 100 Å2 define the "Rule of ~1 /₅" for balancing lipophilicity and permeability. Neutral TPSA, defined as TPSA minus 3D PSA occurs independent of conformation, intramolecular hydrogen bonds (IMHB) and MW, suggesting it is an intrinsic molecular property. Neutral TPSA increased in the lead optimization (LO) campaigns of three first in class de novo designed bRo5 drugs and may be a useful design parameter in bRo5 space.
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Affiliation(s)
- Henrik Möbitz
- Computer-Aided Drug Design, Global Discovery Chemistry, Novartis BioMedical Research, 4002, Basel, Switzerland
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15
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Pinetre C, Harfouche L, Brandel C, Bendeif EE, Sanselme M, Cartigny Y, Couvrat N, Dupray V. Investigation of the Binary System of Proxyphylline Enantiomers: Structural Resolution and Phase Diagram Determination. Mol Pharm 2024; 21:845-853. [PMID: 38134443 DOI: 10.1021/acs.molpharmaceut.3c00922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2023]
Abstract
The solid-state landscape of proxyphylline (PXL), a chiral derivative of theophylline crystallizing as a racemic compound, was extensively investigated by means of thermal analyses and diffraction techniques. This study revealed the presence of five distinct polymorphic forms that were characterized: two polymorphs of the racemic mixture and three polymorphs of the pure enantiomer. The nature of each solid phase was confirmed by combining the different analytical techniques, revealing the presence of a thermodynamically stable racemic compound, RI (TFus= 134 °C), in equilibrium with the stable enantiopure crystal form, EI (TFus = 148.3 °C). Additionally, other crystal forms could be evidenced: a polymorph of the racemic compound, RII (TFus= 111.5 °C), as well as two metastable conglomerates, cEI and cEII, and two other polymorphs of the pure enantiomer, EII and EIII. The crystal structures of RI and EI are reported and discussed, highlighting the diversity of molecular conformations that can be adopted by the PXL molecule, which accounts for the versatility of the crystallization behaviors observed in this system. These findings enhance our understanding of the crystallization behavior of chiral pharmaceutical compounds and have implications for optimizing their crystallization processes in the pharmaceutical industry.
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Affiliation(s)
- Clément Pinetre
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
| | - Lina Harfouche
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
| | - Clément Brandel
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
| | | | - Morgane Sanselme
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
| | - Yohann Cartigny
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
| | - Nicolas Couvrat
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
| | - Valérie Dupray
- Univ Rouen Normandie, Normandie Univ, SMS, UR 3233, F-76000 Rouen, France
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16
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Bejoymohandas KS, Redhu A, Sharma CH, SeethaLekshmi S, Divya IS, Kiran MSRN, Thalakulam M, Monti F, Nair RV, Varughese S. Polymorphism-driven Distinct Nanomechanical, Optical, Photophysical, and Conducting Properties in a Benzothiophene-quinoline. Chemistry 2024; 30:e202303558. [PMID: 38037264 DOI: 10.1002/chem.202303558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/30/2023] [Accepted: 11/30/2023] [Indexed: 12/02/2023]
Abstract
Polymorphic forms of organic conjugated small molecules, with their unique molecular shapes, packing arrangements, and interaction patterns, provide an excellent opportunity to uncover how their microstructures influence their observable properties. Ethyl-2-(1-benzothiophene-2-yl)quinoline-4-carboxylate (BZQ) exists as dimorphs with distinct crystal habits - blocks (BZB) and needles (BZN). The crystal forms differ in their molecular arrangements - BZB has a slip-stacked column-like structure in contrast to a zig-zag crystal packing with limited π-overlap in BZN. The BZB crystals characterized by extended π-stacking along [100] demonstrated semiconductor behavior, whereas the BZN, with its zig-zag crystal packing and limited stacking characteristics, was reckoned as an insulator. Monotropically related crystal forms also differ in their nanomechanical properties, with BZB crystals being considerably softer than BZN crystals. This discrepancy in mechanical behavior can be attributed to the distinct molecular arrangements adopted by each crystal form, resulting in unique mechanisms to relieve the strain generated during nanoindentation experiments. Waveguiding experiments on the acicular crystals of BZN revealed the passive waveguiding properties. Excitation of these crystals using a 532 nm laser confirmed the propagation of elastically scattered photons (green) and the subsequent generation of inelastically scattered (orange) photons by the crystals. Further, the dimorphs display dissimilar photoluminescence properties; they are both blue-emissive, but BZN displays twice the quantum yield of BZB. The study underscores the integral role of polymorphism in modulating the mechanical, photophysical, and conducting properties of functional molecular materials. Importantly, our findings reveal the existence of light-emitting crystal polymorphs with varying electric conductivity, a relatively scarce phenomenon in the literature.
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Affiliation(s)
- K S Bejoymohandas
- Chemical Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram, Kerala, 695019, India
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Via P. Gobetti 101, I-40129, Bologna, Italy
| | - Ashish Redhu
- Department of Physics, Indian Institute of Technology Ropar, Punjab, 140001, India
| | - Chithra H Sharma
- School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala, 695551, India
| | - Sunil SeethaLekshmi
- Chemical Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram, Kerala, 695019, India
| | - I S Divya
- Chemical Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram, Kerala, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - M S R N Kiran
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Chennai, 603203, India
| | - Madhu Thalakulam
- School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala, 695551, India
| | - Filippo Monti
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Via P. Gobetti 101, I-40129, Bologna, Italy
| | - Rajesh V Nair
- Department of Physics, Indian Institute of Technology Ropar, Punjab, 140001, India
| | - Sunil Varughese
- Chemical Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram, Kerala, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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17
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Ghasemlou S, Cuppen HM. Mechanism of Phase Transition in dl-Methionine: Determining Cooperative and Molecule-by-Molecule Transformations. ACS OMEGA 2024; 9:3229-3239. [PMID: 38284040 PMCID: PMC10809693 DOI: 10.1021/acsomega.3c04846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/30/2023] [Accepted: 09/04/2023] [Indexed: 01/30/2024]
Abstract
The solid-state phase transition in dl-methionine has been extensively studied because of its atypical behavior. The transition occurs through changes in the molecular conformation and 3D packing of the molecules. Phase transitions in racemic aliphatic amino acid crystals are known to show different behaviors depending on whether conformational changes or packing changes are involved, where the former is thought to proceed through a nucleation-and-growth mechanism in a standard molecule-by-molecule picture, and the latter through a cooperative mechanism. The phase transition of dl-methionine resembles the thermodynamic, kinetic, and structural features of both categories: a conformational change and relative shifts between layers in two directions. The present paper presents molecular dynamics simulations of the phase transition to examine the underlying mechanism from two perspectives: (i) analysis of the scaling behavior of the free energy barriers involved in the phase transition and (ii) a structural inspection of the phase transition. Both methods can help to distinguish between a concerted phase change and a molecule-by-molecule or zip-like mechanism. The free energy predominantly scales with the system size, which suggests a cooperative mechanism. The structural changes draw, however, a slightly more complex picture. The conformational changes appear to occur in a molecule-by-molecule fashion, where the rotational movement is triggered by movement in the same layer. Conformational changes occur on a time scale nearly twice as long as the shifts between layers. Shifts in one direction appear to be less concerted than shifts in the perpendicular direction. We relate this to the edge-free energy involved in these shifts. We believe that the behavior observed in dl-methionine is likely applicable to phase transitions in other layered systems that interact through aliphatic chains as well.
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Affiliation(s)
- Saba Ghasemlou
- Faculty
of Science, Institute for Molecules and
Materials, Radboud University, Nijmegen 6500 HC, The Netherlands
| | - Herma M. Cuppen
- Faculty
of Science, Institute for Molecules and
Materials, Radboud University, Nijmegen 6500 HC, The Netherlands
- Computational
Chemistry Group, Van’t Hoff Institute
for Molecular Sciences, University of Amsterdam, Amsterdam 1090 GD, The Netherlands
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18
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Gutiérrez-Flores J, H Huerta E, Cuevas G, Garza J, Vargas R. Revealing the Role of Noncovalent Interactions on the Conformation of the Methyl Group in Tricyclic Orthoamide. J Org Chem 2024; 89:257-268. [PMID: 38100710 PMCID: PMC10921461 DOI: 10.1021/acs.joc.3c02016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/22/2023] [Accepted: 11/28/2023] [Indexed: 12/17/2023]
Abstract
Tricyclic orthoamides are valuable molecules with wide-ranging applications, including organic synthesis and molecular recognition. Their structural properties make them intriguing, particularly the eclipsed all-trans conformer, which is typically less stable than the alternated conformation and is a rare phenomenon in organic chemistry. However, it gains stability in crystalline and hydrated settings, challenging the existing theoretical explanations. This study investigates which factors make eclipsed conformers more stable using experimentally reported anhydrous (ATO) and hydrated (HTO) crystal structures. Employing the quantum theory of atoms in molecules, noncovalent interaction index, and pairwise energy decomposition analysis, we delve into the noncovalent interaction environment surrounding the molecule of interest. In ATO, dispersive interactions dominate, whereas in HTO, both dispersive and electrostatic contributions are observed due to the presence of water molecules. Anchored to the lone pairs of the nitrogen atom in the orthoamide tricycle, water molecules prompt the methyl group's eclipsing through intermolecular and intramolecular interactions. This work resolves the long-standing conflict behind why tricyclic orthoamide has an eclipsed conformation by establishing the stabilization factors. These insights have implications for crystal engineering and design, enhancing our understanding of structural behavior in both crystalline and hydrated environments.
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Affiliation(s)
- Jorge Gutiérrez-Flores
- Departamento
de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C.P. 09340 Ciudad
de México, México
| | - Eduardo H Huerta
- Insituto
de Química, Universidad Nacional
Autónoma de México, Circuito Exterior, Ciudad Universitaria, Alcaldía Coyoacán C.P. 04510 Ciudad
de México, México
| | - Gabriel Cuevas
- Insituto
de Química, Universidad Nacional
Autónoma de México, Circuito Exterior, Ciudad Universitaria, Alcaldía Coyoacán C.P. 04510 Ciudad
de México, México
| | - Jorge Garza
- Departamento
de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C.P. 09340 Ciudad
de México, México
| | - Rubicelia Vargas
- Departamento
de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C.P. 09340 Ciudad
de México, México
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19
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Beran GJO. Frontiers of molecular crystal structure prediction for pharmaceuticals and functional organic materials. Chem Sci 2023; 14:13290-13312. [PMID: 38033897 PMCID: PMC10685338 DOI: 10.1039/d3sc03903j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 11/02/2023] [Indexed: 12/02/2023] Open
Abstract
The reliability of organic molecular crystal structure prediction has improved tremendously in recent years. Crystal structure predictions for small, mostly rigid molecules are quickly becoming routine. Structure predictions for larger, highly flexible molecules are more challenging, but their crystal structures can also now be predicted with increasing rates of success. These advances are ushering in a new era where crystal structure prediction drives the experimental discovery of new solid forms. After briefly discussing the computational methods that enable successful crystal structure prediction, this perspective presents case studies from the literature that demonstrate how state-of-the-art crystal structure prediction can transform how scientists approach problems involving the organic solid state. Applications to pharmaceuticals, porous organic materials, photomechanical crystals, organic semi-conductors, and nuclear magnetic resonance crystallography are included. Finally, efforts to improve our understanding of which predicted crystal structures can actually be produced experimentally and other outstanding challenges are discussed.
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Affiliation(s)
- Gregory J O Beran
- Department of Chemistry, University of California Riverside Riverside CA 92521 USA
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20
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Abstract
Twenty years ago, I wrote a Chem. Commun. feature article entitled "Crystal Engineering: where from? Where to?": an update is in order. In this Highlight I argue that molecular crystal engineering, one of the areas of fast development of the field, has definitely reached the stage of "delivering the goods": new functional materials assembled via non-covalent interactions and/or improved properties of existing materials. As a proof of concept, the crystal engineering approach to tackle two contemporary emergencies, namely, urea fertilizer degradation and development of antimicrobial resistance by pathogens, is discussed and application-driven examples are provided.
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Affiliation(s)
- Dario Braga
- Chemistry Department G. Ciamician, University of Bologna, Via F. Selmi 2, 4016 Bologna, Italy.
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21
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Nath J, Baruah JB. E- or Z-Isomers Arising from the Geometries of Ligands in the Mercury Complex of 2-(Anthracen-9-ylmethylene)- N-phenylhydrazine Carbothioamide. ACS OMEGA 2023; 8:42827-42839. [PMID: 38024736 PMCID: PMC10653070 DOI: 10.1021/acsomega.3c05806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 09/30/2023] [Accepted: 10/11/2023] [Indexed: 12/01/2023]
Abstract
An anionic mercury(II) complex of 2-(anthracen-9-ylmethylene)-N-phenylhydrazine carbothioamide (HATU) and two isomers of a neutral mercury(II) complex of the anion of the same ligand (ATU) were reported. The anionic complex [Hg(HATU)2Cl2]·CH2Cl2 had a monodentate HATU ligand (a neutral form of the ligand) and chloride ligands. The two conformational isomers were of the neutral mercury(II) complex Hg(ATU)2·2DMF. The two isomers were from the E or Z geometry of the ligands across the conjugated C=N-N=C-N scaffold of the coordinated ligand. The two isomers of the complex were independently prepared and characterized. The spectroscopic properties of the isomers in solution were studied by 1H NMR as well as fluorescence spectroscopy. Facile conversion of the E-isomer to the Z-isomer in solution was observed. Density functional theory (DFT) calculations revealed that the Z-isomer of the complex was stable compared to the E-isomer by an energy of 14.35 kJ/mol; whereas, E isomer of the ligand was more stable than Z isomer by 8.37 KJ/mol. The activation barrier for the conversion of the E-isomer to the Z-isomer of the ligand was 167.37 kJ/mol. The role of the mercury ion in the conversion of the E-form to the Z-form was discussed. The mercury complex [Hg(HATU)2Cl2]·CH2Cl2 had the E-form of the ligand. Distinct photophysical features of these mercury complexes were presented.
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Affiliation(s)
- Jitendra Nath
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam India
| | - Jubaraj B. Baruah
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam India
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22
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Usui K, Amano A, Murayama K, Sasaya M, Kusumoto R, Umeno T, Murase S, Iizuka N, Matsumoto S, Fuchi Y, Takahashi K, Kawahata M, Kobori Y, Karasawa S. Photoisomerization of "Partially Embedded Dihydropyridazine" with a Helical Structure. Chemistry 2023; 29:e202302413. [PMID: 37612241 DOI: 10.1002/chem.202302413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/21/2023] [Accepted: 08/23/2023] [Indexed: 08/25/2023]
Abstract
Herein, we report the synthesis of two "partially embedded fused-dihydropyridazine N-aryl aza[5]helicene derivatives" (PDHs) and the demonstration of their intrinsic photo-triggered multi-functional properties based on a Kekulé biradical structure. Introducing bulky electron-withdrawing trifluoromethyl or pentafluoroethyl groups into the aza[5]helicene framework (PDH-CF3 and -C2 F5 ) gives PDH axial chirality based on the helicity of the P and M forms, even at room temperature. Upon photo-irradiation of PDH-CF3 in a frozen solution, an ESR signal from the triplet biradical with zero-field splitting values, generated by N-N bond dissociation, was observed. However, when the irradiation was turned off, the ESR signal became silent, thus indicating the existence of two equilibria: between the biradical and quinoidal forms based on the Kekulé structure, and between N-N bond cleavage and recombination. The observed photo- and thermally induced behaviors indicate that T-type photochromic molecules are involved in the photoisomerization mechanism involving the two equilibria. Inspired by the photoisomerization, chirality control of PDH by photoracemization was achieved. Multiple functionalities, such as T-type photochromism, photo-excitation-mediated triplet biradical formation, and photoracemization, which are attributed to the "partially embedded dihydropyridazine" structure, are demonstrated.
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Affiliation(s)
- Kazuteru Usui
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Ami Amano
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Kasumi Murayama
- Department of Chemistry, Graduate School of Science Kobe University, Kobe, Hyogo, 657-8501, Japan
| | - Miho Sasaya
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Ryota Kusumoto
- Department of Chemistry, Graduate School of Science Kobe University, Kobe, Hyogo, 657-8501, Japan
| | - Tomohiro Umeno
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Satsuki Murase
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Naoko Iizuka
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Shota Matsumoto
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Yasufumi Fuchi
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Kazuyuki Takahashi
- Department of Chemistry, Graduate School of Science Kobe University, Kobe, Hyogo, 657-8501, Japan
| | - Masatoshi Kawahata
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Yasuhiro Kobori
- Department of Chemistry, Graduate School of Science Kobe University, Kobe, Hyogo, 657-8501, Japan
- Molecular Photoscience Research Center, Graduate School of Science Kobe University, Kobe, Hyogo, 657-8501, Japan
| | - Satoru Karasawa
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3512-1 Higashi-tamagawagakuen, Machida, Tokyo, 194-8543, Japan
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23
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Shamshina JL, Rogers RD. Ionic Liquids: New Forms of Active Pharmaceutical Ingredients with Unique, Tunable Properties. Chem Rev 2023; 123:11894-11953. [PMID: 37797342 DOI: 10.1021/acs.chemrev.3c00384] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
This Review aims to summarize advances over the last 15 years in the development of active pharmaceutical ingredient ionic liquids (API-ILs), which make up a prospective game-changing strategy to overcome multiple problems with conventional solid-state drugs, for example, polymorphism. A critical part of the present Review is the collection of API-ILs and deep eutectic solvents (DESs) prepared to date. The Review covers rules for rational design of API-ILs and tools for API-IL formation, syntheses, and characterization. Nomenclature and ionic speciation, and the confusion that these may cause, are highlighted, particularly for speciation in both ILs and DESs of intermediate ionicity. We also highlight in vivo and in vitro pharmaceutical activity studies, with differences in pharmacokinetic/pharmacodynamic depending on ionicity of API-ILs. A brief overview is provided for the ILs used to deliver drugs, and the Review concludes with key prospects and roadblocks in translating API-ILs into pharmaceutical manufacturing.
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Affiliation(s)
- Julia L Shamshina
- Fiber and Biopolymer Research Institute (FBRI), Texas Tech University, Lubbock, Texas 79409, United States
| | - Robin D Rogers
- 525 Solutions, Inc., P.O. Box 2206, Tuscaloosa, Alabama 35403, United States
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24
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Chaudhary S, Kędziera D, Rafiński Z, Dobrzańska L. Solvent-induced polymorphism in dipodal N-donor ligands containing a biphenyl core. RSC Adv 2023; 13:30625-30632. [PMID: 37859777 PMCID: PMC10582825 DOI: 10.1039/d3ra05713e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 10/06/2023] [Indexed: 10/21/2023] Open
Abstract
Polymorph screenings for two related dipodal N-donor ligands containing a biphenyl core, namely 4,4'-bis(pyridin-4-ylmethyl)-1,1'-biphenyl (1) and 4,4'-bis(1H-imidazol-1-ylmethyl)-1,1'-biphenyl (2) were performed, and the new phases were isolated and their crystal structures analysed. Profiling included methods such as PXRD and thermal analysis. Hirshfeld surface analyses, as well as crystal lattice energy calculations provided deeper insight in the interplay of the intermolecular forces and the stability of the isolated phases. Furthermore, our studies revealed the presence of solvent-induced polymorphism, whereby the metastable phase is dominant upon crystallisation from THF (1a) and EtOH (2c). Upon heating, these phases transform into a more stable form, whereby the transformations were followed by PXRD studies (1, 2).
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Affiliation(s)
- Simran Chaudhary
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń Gagarina 7, 87-100 Toruń Poland
| | - Dariusz Kędziera
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń Gagarina 7, 87-100 Toruń Poland
| | - Zbigniew Rafiński
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń Gagarina 7, 87-100 Toruń Poland
| | - Liliana Dobrzańska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń Gagarina 7, 87-100 Toruń Poland
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25
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Gransbury G, Corner SC, Kragskow JGC, Evans P, Yeung HM, Blackmore WJA, Whitehead GFS, Vitorica-Yrezabal IJ, Oakley MS, Chilton NF, Mills DP. AtomAccess: A Predictive Tool for Molecular Design and Its Application to the Targeted Synthesis of Dysprosium Single-Molecule Magnets. J Am Chem Soc 2023; 145:22814-22825. [PMID: 37797311 PMCID: PMC10591469 DOI: 10.1021/jacs.3c08841] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Indexed: 10/07/2023]
Abstract
Isolated dysprosocenium cations, [Dy(CpR)2]+ (CpR = substituted cyclopentadienyl), have recently been shown to exhibit superior single-molecule magnet (SMM) properties over closely related complexes with equatorially bound ligands. However, gauging the crossover point at which the CpR substituents are large enough to prevent equatorial ligand binding, but small enough to approach the metal closely and generate strong crystal field splitting has required laborious synthetic optimization. We therefore created the computer program AtomAccess to predict the accessibility of a metal binding site and its ability to accommodate additional ligands. Here, we apply AtomAccess to identify the crossover point for equatorial coordination in [Dy(CpR)2]+ cations in silico and hence predict a cation that is at the cusp of stability without equatorial interactions, viz., [Dy(Cpttt)(Cp*)]+ (Cpttt = C5H2tBu3-1,2,4, Cp* = C5Me5). Upon synthesizing this cation, we found that it crystallizes as either a contact ion-pair, [Dy(Cpttt)(Cp*){Al[OC(CF3)3]4-κ-F}], or separated ion-pair polymorph, [Dy(Cpttt)(Cp*)][Al{OC(CF3)3}4]·C6H6. Upon characterizing these complexes, together with their precursors, yttrium and yttrium-doped analogues, we find that the contact ion-pair shows inferior SMM properties to the separated ion-pair, as expected, due to faster Raman and quantum tunneling of magnetization relaxation processes, while the Orbach region is relatively unaffected. The experimental verification of the predicted crossover point for equatorial coordination in this work tests the limitations of the use of AtomAccess as a predictive tool and also indicates that the application of this type of program shows considerable potential to boost efficiency in exploratory synthetic chemistry.
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Affiliation(s)
| | | | - Jon G. C. Kragskow
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Peter Evans
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Hing Man Yeung
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - William J. A. Blackmore
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - George F. S. Whitehead
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | | | - Meagan S. Oakley
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Nicholas F. Chilton
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - David P. Mills
- Department of Chemistry, The
University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
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26
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Carpenter BP, Talosig AR, Rose B, Di Palma G, Patterson JP. Understanding and controlling the nucleation and growth of metal-organic frameworks. Chem Soc Rev 2023; 52:6918-6937. [PMID: 37796101 DOI: 10.1039/d3cs00312d] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Metal-organic frameworks offer a diverse landscape of building blocks to design high performance materials for implications in almost every major industry. With this diversity stems complex crystallization mechanisms with various pathways and intermediates. Crystallization studies have been key to the advancement of countless biological and synthetic systems, with MOFs being no exception. This review provides an overview of the current theories and fundamental chemistry used to decipher MOF crystallization. We then discuss how intrinsic and extrinsic synthetic parameters can be used as tools to modulate the crystallization pathway to produce MOF crystals with finely tuned physical and chemical properties. Experimental and computational methods are provided to guide the probing of MOF crystal formation on the molecular and bulk scale. Lastly, we summarize the recent major advances in the field and our outlook on the exciting future of MOF crystallization.
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Affiliation(s)
- Brooke P Carpenter
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697-2025, USA.
| | - A Rain Talosig
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697-2025, USA.
| | - Ben Rose
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697-2025, USA.
| | - Giuseppe Di Palma
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697-2025, USA.
| | - Joseph P Patterson
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697-2025, USA.
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27
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Ward M, Taylor CR, Mulvee MT, Lampronti GI, Belenguer AM, Steed JW, Day GM, Oswald IDH. Pushing Technique Boundaries to Probe Conformational Polymorphism. CRYSTAL GROWTH & DESIGN 2023; 23:7217-7230. [PMID: 37808905 PMCID: PMC10557047 DOI: 10.1021/acs.cgd.3c00641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 08/11/2023] [Indexed: 10/10/2023]
Abstract
We present an extensive exploration of the solid-form landscape of chlorpropamide (CPA) using a combined experimental-computational approach at the frontiers of both fields. We have obtained new conformational polymorphs of CPA, placing them into context with known forms using flexible-molecule crystal structure prediction. We highlight the formation of a new polymorph (ζ-CPA) via spray-drying experiments despite its notable metastability (14 kJ/mol) relative to the thermodynamic α-form, and we identify and resolve the ball-milled η-form isolated in 2019. Additionally, we employ impurity- and gel-assisted crystallization to control polymorphism and the formation of novel multicomponent forms. We, thus, demonstrate the power of this collaborative screening approach to observe, rationalize, and control the formation of new metastable forms.
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Affiliation(s)
- Martin
R. Ward
- Strathclyde
Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, U.K.
| | - Christopher R. Taylor
- Computational
Systems Chemistry, School of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K.
| | - Matthew T. Mulvee
- Department
of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K.
| | - Giulio I. Lampronti
- Department
of Materials Science & Metallurgy, University
of Cambridge, 27 Charles Babbage Rd, Cambridge CB3 0FS, U.K.
| | - Ana M. Belenguer
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield
Road, Cambridge CB2 1EW, U.K.
| | - Jonathan W. Steed
- Department
of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K.
| | - Graeme M. Day
- Computational
Systems Chemistry, School of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K.
| | - Iain D. H. Oswald
- Strathclyde
Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, U.K.
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28
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Riaz M, Ali A, Ashfaq M, Ibrahim M, Akram N, Tahir MN, Kuznetsov A, Rodríguez L, Sameeh MY, Assiri MA, Torre AFDL. Polymorphs of Substituted p-Toluenesulfonanilide: Synthesis, Single-Crystal Analysis, Hirshfeld Surface Exploration, and Theoretical Investigation. ACS OMEGA 2023; 8:35307-35320. [PMID: 37779999 PMCID: PMC10536877 DOI: 10.1021/acsomega.3c04957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 09/07/2023] [Indexed: 10/03/2023]
Abstract
Polymorphism is an exciting feature of chemical systems where a compound can exist in different crystal forms. The present investigation is focused on the two polymorphic forms, triclinic (MSBT) and monoclinic (MSBM), of ethyl 3-iodo-4-((4-methylphenyl)sulfonamido)benzoate prepared from ethyl 4-amino-3-iodobenzoate. The prepared polymorphs were unambiguously confirmed by single-crystal X-ray diffraction (SC-XRD) analysis. According to the SC-XRD results, the molecular configurations of both structures are stabilized by intramolecular N-H···I and C-H···O bonding. The crystal packing of MSBT is different as compared to the crystal packing of MSBM because MSBT is crystallized in the triclinic crystal system with the space group P1̅, whereas MSBM is crystallized in the monoclinic crystal system with the space group P21/c. The molecules of MSBT are interlinked in the form of dimers through N-H···O bonding to form R22(8) loops, while the MSBM molecules are connected with each other in the form of an infinite chain through C-H···O bonding. The crystal packing of both compounds is further stabilized by off-set π···π stacking interactions between phenyl rings, which is found stronger in MSBM as compared to in MSBT. Moreover, Hirshfeld surface exploration of the polymorphs was carried out, and the results were compared with the closely related literature structure. Accordingly, the supramolecular assembly of these polymorphs is mainly stabilized by noncovalent interactions or intermolecular interactions. Furthermore, a density functional theory (DFT) study was also carried out, which provided good support for the SC-XRD and Hirshfeld studies, suggesting the formation of both intramolecular and intermolecular interactions for both compounds.
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Affiliation(s)
- Mehreen Riaz
- Department
of Applied Chemistry, Government College
University Faisalabad, 38000 Faisalabad, Pakistan
| | - Akbar Ali
- Department
of Chemistry, Government College University
Faisalabad, 38000 Faisalabad, Pakistan
| | - Muhammad Ashfaq
- Department
of Physics, University of Sargodha, 40100 Sargodha, Pakistan
| | - Muhammad Ibrahim
- Department
of Applied Chemistry, Government College
University Faisalabad, 38000 Faisalabad, Pakistan
| | - Nadia Akram
- Department
of Chemistry, Government College University
Faisalabad, 38000 Faisalabad, Pakistan
| | | | - Aleksey Kuznetsov
- Departamento
de Química, Campus Santiago Vitacura, Universidad Técnica Federico Santa María, Vitacura 7660251, Chile
| | - Lyanne Rodríguez
- Department
of Clinical Biochemistry and Immunohaematology, Thrombosis Research
Center, Medical Technology School, Faculty of Health Sciences, Universidad de Talca, Talca 3460000, Chile
| | - Manal Y. Sameeh
- Chemistry
Department, Faculty of Applied Sciences, Al-Leith University College, Umm Al-Qura University, Makkah 24831, Saudi Arabia
| | - Mohammed A. Assiri
- Research
center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha 61514, Saudi Arabia
- Department
of Chemistry, Faculty of Science, King Khalid
University, P.O. Box 9004, Abha 61413, Saudi Arabia
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29
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Bu G, Danelius E, Wieske L, Gonen T. Polymorphic Structure Determination of the Macrocyclic Drug Paritaprevir by MicroED. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.09.556999. [PMID: 37781611 PMCID: PMC10541134 DOI: 10.1101/2023.09.09.556999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Paritaprevir is an orally bioavailable, macrocyclic drug used for treating chronic Hepatitis C virus infection. Its structures had been elusive to the public until recently when one of the crystal forms was solved by MicroED. In this work, we report the MicroED structures of two distinct polymorphic crystal forms of paritaprevir from the same experiment. The different polymorphs show conformational changes in the macrocyclic core, as well as the cyclopropylsulfonamide and methylpyrazinamide substituents. Molecular docking shows that one of the conformations fits well into the active site pocket of the NS3/4A serine protease target, and can interact with the pocket and catalytic triad via hydrophobic interactions and hydrogen bonds. These results can provide further insight for optimization of the binding of acylsulfonamide inhibitors to the NS3/4A serine protease. In addition, this also demonstrate the opportunity of deriving different polymorphs and distinct macrocycle conformations from the same experiments using MicroED.
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Affiliation(s)
- G Bu
- Department of Biological Chemistry, University of California Los Angeles, 615 Charles E.Young Drive South, Los Angeles, CA 90095, USA
| | - E Danelius
- Department of Biological Chemistry, University of California Los Angeles, 615 Charles E.Young Drive South, Los Angeles, CA 90095, USA
- Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - L.H Wieske
- Department of Chemistry – BMC, Uppsala University, Husargatan 3, 75237 Uppsala, Sweden
| | - T Gonen
- Department of Biological Chemistry, University of California Los Angeles, 615 Charles E.Young Drive South, Los Angeles, CA 90095, USA
- Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
- Department of Physiology, University of California Los Angeles, 615 Charles E. Young Drive South, Los Angeles, CA 90095, USA
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30
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Dai D, Cao B, Hao XL, Yu ZW. Transition Mechanism from the Metastable Two-Dimensional Gel to the Stable Three-Dimensional Crystal of Imidazolium-Based Ionic Liquids. J Phys Chem B 2023; 127:7323-7333. [PMID: 37560895 DOI: 10.1021/acs.jpcb.3c02720] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
One important quest for making high quality materials with amphiphiles is to understand how a disordered self-assembly changes to a stable crystalline state. Herein, we addressed the basic question by investigating the phase transition mechanism of imidazolium-based ionic liquid (IL) [C16mim]Br, using time-resolved small- and wide-angle X-ray scattering (SAXS-WAXS), differential scanning calorimetry, and Fourier transform infrared spectroscopy techniques. Totally, a hexagonal phase, two lamellar-gel phases, and three lamellar-crystalline phases were observed, showing the special polymorphism of the system. It was demonstrated that at low concentrations the two-dimensional gel phase (Lβ1) transforms into the most stable lamellar-crystal phase (Lc3) through two intermediate crystalline phases Lc1 and Lc2. At high concentrations, the Lβ1 phase changes to a condensed lamellar gel phase (Lβ2) before changing to Lc2 and eventually to Lc3. Comparative studies using [C16mim]Cl and [C16mim]NO3 unveiled that the interactions between the counterions and the headgroups of the IL, as well as the dehydration process, govern the nucleation process of Lc3 and thus the formation of the crystal. The in-depth investigation on the transition mechanism and the phase polymorphism in the present work advances our understanding of the crystallization of amphiphilic ionic liquids in dispersions and would promote future applications.
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Affiliation(s)
- Dong Dai
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Bobo Cao
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Xiao-Lei Hao
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Zhi-Wu Yu
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
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31
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Heinen T, Merzenich S, Kwill A, Vasylyeva V. Halogen Bonding in Sulphonamide Co-Crystals: X···π Preferred over X···O/N? Molecules 2023; 28:5910. [PMID: 37570880 PMCID: PMC10420850 DOI: 10.3390/molecules28155910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/02/2023] [Accepted: 08/04/2023] [Indexed: 08/13/2023] Open
Abstract
Sulphonamides have been one of the major pharmaceutical compound classes since their introduction in the 1930s. Co-crystallisation of sulphonamides with halogen bonding (XB) might lead to a new class of pharmaceutical-relevant co-crystals. We present the synthesis and structural analysis of seven new co-crystals of simple sulphonamides N-methylbenzenesulphonamide (NMBSA), N-phenylmethanesulphonamide (NPMSA), and N-phenylbenzenesulphonamide (BSA), as well as of an anti-diabetic agent Chlorpropamide (CPA), with the model XB-donors 1,4-diiodotetrafluorobenzene (14DITFB), 1,4-dibromotetrafluorobenzene (14DBTFB), and 1,2-diiodotetrafluorobenzene (12DITFB). In the reported co-crystals, X···O/N bonds do not represent the most common intermolecular interaction. Against our rational design expectations and the results of our statistical CSD analysis, the normally less often present X···π interaction dominates the crystal packing. Furthermore, the general interaction pattern in model sulphonamides and the CPA multicomponent crystals differ, mainly due to strong hydrogen bonds blocking possible interaction sites.
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Affiliation(s)
| | | | | | - Vera Vasylyeva
- Laboratory for Molecular Crystal Engineering, Department of Inorganic and Structural Chemistry, Heinrich-Heine University Duesseldorf, Universitaetstr. 1, 40225 Dusseldorf, Germany; (T.H.)
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32
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Fleming M, Swift JA. Enhancement of Hydrate Stability through Substitutional Defects. CRYSTAL GROWTH & DESIGN 2023; 23:5860-5867. [PMID: 37547883 PMCID: PMC10401670 DOI: 10.1021/acs.cgd.3c00457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/10/2023] [Indexed: 08/08/2023]
Abstract
Cytosine monohydrate (CM) and anhydrate crystal forms reversibly interconvert under high temperatures or high humidity conditions. Here, we demonstrate through defect engineering the ability to expand the thermal stability range of CM through the targeted creation of quantifiable defects in low-level concentrations. Twelve different molecular dyes with a variety of core structures and charges were screened as potential dopants in CM. CM-dye phases prepared with Congo red (CR), Evans blue (EB), and Azocarmine G (AG) exhibited the highest inclusion levels (up to 1.1 wt %). In these doped isomorphous materials, each dye is presumed to substitute for 4-7 cytosine molecules within the low-rugosity (102) planes of the CM matrixes, thereby creating a quantifiable substitutional defect and an impediment to the cooperative molecular motions which enable the transformation to the anhydrate. Dehydration of materials with these engineered defects requires significantly higher temperatures and proceeds with slower kinetics compared to pure CM. The CM-dye phases also exhibit a reduction in the thermal expansion along key crystallographic axes and yield dehydration products with altered particle morphologies.
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33
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Lemercier A, Couvrat N, Cartigny Y, Sanselme M, Corvis Y, Espeau P, Coquerel G. Evidence of a New Crystalline Phase of Prednisolone Obtained from the Study of the Hydration-Dehydration Mechanisms of the Sesquihydrate. Pharmaceutics 2023; 15:1694. [PMID: 37376142 DOI: 10.3390/pharmaceutics15061694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 05/26/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
The dehydration of prednisolone sesquihydrate is studied and characterized by different physico-chemical analysis methods. The meticulous study of this dehydration led to the highlighting of a new solid form (form 3), metastable, never identified before. In a second step, the rehydration of anhydrous forms 1 and 2 of prednisolone is studied, in particular by Dynamic Vapor Sorption. It is then demonstrated that neither of the two forms is sensitive to humidity. By means of solid-gas equilibria, the sesquihydrate can only be obtainable from the isomorphic anhydrous form. Finally, a classification of the sesquihydrate is made, taking into account, in particular, the activation energy determined during dehydration.
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Affiliation(s)
| | - Nicolas Couvrat
- SMS, UR 3233, Université Rouen Normandie, 76000 Rouen, France
| | - Yohann Cartigny
- SMS, UR 3233, Université Rouen Normandie, 76000 Rouen, France
| | | | - Yohann Corvis
- CNRS, INSERM, UTCBS, Chemical and Biological Technologies for Health Group, Université Paris Cité, 75006 Paris, France
| | - Philippe Espeau
- CNRS, INSERM, UTCBS, Chemical and Biological Technologies for Health Group, Université Paris Cité, 75006 Paris, France
| | - Gérard Coquerel
- SMS, UR 3233, Université Rouen Normandie, 76000 Rouen, France
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34
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Sheng K, Wang Z, Li L, Gao ZY, Tung CH, Sun D. Solvent-Mediated Separation and Reversible Transformation of 1D Supramolecular Polymorphs Built from [W 10O 32] 4- Templated 48-Nuclei Silver(I) Cluster. J Am Chem Soc 2023; 145:10595-10603. [PMID: 37139688 DOI: 10.1021/jacs.3c00321] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Although the C-H···O interaction is an essential component in determining the molecular packing in solids and the properties in supramolecular chemistry, it presents a significant challenge when trying to use it in the crystal engineering of complex metallosupramolecules, even though it is a relatively weak supramolecular force. The first pair of high-nuclearity silver-cluster-based one-dimensional (1D) polymorphs built from supramolecular synthon [W10O32@Ag48(CyS)24(NO3)16]·4NO3 (Cy = cyclohexyl) bridged by four grouped inorganic NO3- ligands is initially synthesized as a mixed phase and further individually crystallized as a pure phase by virtue of tuning intermolecular C-H···O interaction through altering the composition ratio of ternary solvent system. Increasing highly polar and hydrogen-bonding methanol strengthens the solvation effect reflected by the change of coordination orientation of surface NO3- ligands, which dominates the packing of the 1D chains in the crystal lattice, resulting in the crystallization of polymorphs from tetragonal to monoclinic. The two crystalline forms can also be reversibly transformed to each other in an appropriate solvent system. Correspondingly, the two polymorphs display distinct temperature-dependent photoluminescence behaviors, which are ascribed to the variation of noncovalent interchain C-H···O interactions along with the temperature. More importantly, benefiting from the suppression of fluorescence, both polymorphs offer excellent photothermal conversion properties which were further applied to remote-controlled laser ignition. These findings may open more avenues for the application of solvent-mediated intermolecular interaction in controlling the molecule arrangement as well as the optical properties.
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Affiliation(s)
- Kai Sheng
- School of Aeronautics, Shandong Jiaotong University, Ji'nan 250037, P. R. China
| | - Zhi Wang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, P. R. China
| | - Li Li
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, P. R. China
| | - Zhi-Yong Gao
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, P. R. China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, P. R. China
| | - Di Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, P. R. China
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35
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Metherall JP, Carroll RC, Coles SJ, Hall MJ, Probert MR. Advanced crystallisation methods for small organic molecules. Chem Soc Rev 2023; 52:1995-2010. [PMID: 36857636 DOI: 10.1039/d2cs00697a] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Molecular materials based on small organic molecules often require advanced structural analysis, beyond the capability of spectroscopic techniques, to fully characterise them. In such cases, diffraction methods such as single crystal X-ray diffraction (SCXRD), are one of the most powerful tools available to researchers, providing molecular and structural elucidation at atomic level resolution, including absolute stereochemistry. However SCXRD, and related diffraction methods, are heavily dependent on the availability of suitable, high-quality crystals, thus crystallisation often becomes the major bottleneck in preparing samples. Following a summary of classical methods for the crystallisation of small organic molecules, this review will focus on a number of recently developed advanced methods for crystalline material sample preparation for SCXRD. This review will cover two main areas of modern small organic molecule crystallisation, namely the inclusion of molecules within host complexes (e.g., "crystalline sponge" and tetraaryladamantane based inclusion chaperones) and the use of high-throughput crystallisation, employing "under-oil" approaches (e.g., microbatch under-oil and ENaCt). Representative examples have been included for each technique, together with a discussion of their relative advantages and limitations to aid the reader in selecting the most appropriate technique to overcome a specific analytical challenge.
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Affiliation(s)
- J P Metherall
- Newcastle University, Chemistry - School of Natural Environmental Sciences, Newcastle upon Tyne, NE1 7RU, UK.
| | - R C Carroll
- University of Southampton, School of Chemistry, Southampton, SO17 1BJ, UK
| | - S J Coles
- University of Southampton, School of Chemistry, Southampton, SO17 1BJ, UK
| | - M J Hall
- Newcastle University, Chemistry - School of Natural Environmental Sciences, Newcastle upon Tyne, NE1 7RU, UK.
| | - M R Probert
- Newcastle University, Chemistry - School of Natural Environmental Sciences, Newcastle upon Tyne, NE1 7RU, UK.
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36
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Oparin RD, Krestyaninov MA, Ivlev DV, Kiselev MG. Molecular Mechanism of Conformational Crossover of Mefenamic Acid Molecules in scCO 2. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1403. [PMID: 36837033 PMCID: PMC9963762 DOI: 10.3390/ma16041403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/02/2023] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
In this work, we studied conformational equilibria of molecules of mefenamic acid in its diluted solution in scCO2 under isochoric heating conditions in the temperature range of 140-210 °C along the isochore corresponding to the scCO2 density of 1.1 of its critical value. This phase diagram range totally covers the region of conformational transitions of molecules of mefenamic acid in its saturated solution in scCO2. We found that in the considered phase diagram region, the equilibrium of two conformers is realized in this solution. In the temperature range of 140-180 °C, conformer I related to the first, most stable polymorph of mefenamic acid prevails. In the temperature range of 200-210 °C, conformer II, which is related to the second metastable polymorph becomes dominant. Based on the results of quantum chemical calculations and experimental IR spectroscopy data on the mefenamic acid conformer populations, we classified this temperature-induced conformational crossover as an entropy-driven phenomenon.
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37
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Basuroy K, Velazquez-Garcia JDJ, Storozhuk D, Henning R, Gosztola DJ, Thekku Veedu S, Techert S. Axial vs equatorial: Capturing the intramolecular charge transfer state geometry in conformational polymorphic crystals of a donor-bridge-acceptor dyad in nanosecond-time-scale. J Chem Phys 2023; 158:054304. [PMID: 36754826 PMCID: PMC10481388 DOI: 10.1063/5.0134792] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 01/11/2023] [Indexed: 01/15/2023] Open
Abstract
Two conformational polymorphs of a donor-bridge-acceptor (D-B-A) dyad, p-(CH3)2N-C6H4-(CH2)2-(1-pyrenyl)/PyCHDMA, were studied, where the electron donor (D) moiety p-(CH3)2N-C6H4/DMA is connected through a bridging group (B), -CH2-CH2-, to the electron acceptor (A) moiety pyrene. Though molecular dyads like PyCHDMA have the potential to change solar energy into electrical current through the process of photoinduced intramolecular charge transfer (ICT), the major challenge is the real-time investigation of the photoinduced ICT process in crystals, necessary to design solid-state optoelectronic materials. The time-correlated single photon counting (TCSPC) measurements with the single crystals showed that the ICT state lifetime of the thermodynamic form, PyCHDMA1 (pyrene and DMA: axial), is ∼3 ns, whereas, for the kinetic form, PyCHDMA20 (pyrene and DMA: equatorial), it is ∼7 ns, while photoexcited with 375 nm radiation. The polymorphic crystals were photo-excited and subsequently probed with a pink Laue x-ray beam in time-resolved x-ray diffraction (TRXRD) measurements. The TRXRD results suggest that in the ICT state, due to electron transfer from the tertiary N-atom in DMA moiety to the bridging group and pyrene moiety, a decreased repulsion between the lone-pair and the bond-pair at N-atom induces planarity in the C-N-(CH3)2 moiety, in both polymorphs. The Natural Bond Orbital calculations and partial atomic charge analysis by Hirshfeld partitioning also corroborated the same. Although the interfragment charge transfer (IFCT) analysis using the TDDFT results showed that for the charge transfer excitation in both conformers, the electrons were transferred from the DMA moiety to mostly the pyrene moiety, the bridging group has little role to play in that.
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Affiliation(s)
- Krishnayan Basuroy
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | | | - Darina Storozhuk
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Robert Henning
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, USA
| | - David J. Gosztola
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
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38
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Abe H, Kishimura H, Uruichi M. A phase variety of fluorinated ionic liquids: Molecular conformational and crystal polymorph. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 286:121948. [PMID: 36252301 DOI: 10.1016/j.saa.2022.121948] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/26/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Crystal polymorphs of fluorinated ionic liquids (fILs) were examined at low-temperature (LT) by Raman spectroscopy. The fILs were 1-alkyl-3-methylimidazolium perfluorobutanesulfonate, [Cnmim][PFBS] (n = 4, 6, and 8). The cations and anion possess conformational degrees of freedom. Various LT phases were derived from the conformational polymorphs of the cations and the anion. Conformational flexibility depended on alkyl chain length. The crystal polymorphs in the fILs were sensitive to molecular conformations and flexibility.
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Affiliation(s)
- Hiroshi Abe
- Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan
| | - Hiroaki Kishimura
- Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan
| | - Mikio Uruichi
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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Elishav O, Podgaetsky R, Meikler O, Hirshberg B. Collective Variables for Conformational Polymorphism in Molecular Crystals. J Phys Chem Lett 2023; 14:971-976. [PMID: 36689770 PMCID: PMC9900638 DOI: 10.1021/acs.jpclett.2c03491] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/12/2023] [Indexed: 06/17/2023]
Abstract
Controlling polymorphism in molecular crystals is crucial in the pharmaceutical, dye, and pesticide industries. However, its theoretical description is extremely challenging, due to the associated long time scales (>1 μs). We present an efficient procedure for identifying collective variables that promote transitions between conformational polymorphs in molecular dynamics simulations. It involves applying a simple dimensionality reduction algorithm to data from short (∼ps) simulations of the isolated conformers that correspond to each polymorph. We demonstrate the utility of our method in the challenging case of the important energetic material, CL-20, which has three anhydrous conformational polymorphs at ambient pressure. Using these collective variables in Metadynamics simulations, we observe transitions between all solid polymorphs in the biased trajectories. We reconstruct the free energy surface and identify previously unknown defect and intermediate forms in the transition from one known polymorph to another. Our method provides insights into complex conformational polymorphic transitions of flexible molecular crystals.
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Affiliation(s)
- Oren Elishav
- School
of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Roy Podgaetsky
- School
of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Olga Meikler
- Rafael
Ltd., P.O. Box 2250, Haifa 3102102, Israel
| | - Barak Hirshberg
- School
of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
- The
Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 6997801, Israel
- The
Ratner Center for Single Molecule Science, Tel Aviv University, Tel Aviv 6997801, Israel
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40
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Tautomerism unveils a self-inhibition mechanism of crystallization. Nat Commun 2023; 14:561. [PMID: 36732334 PMCID: PMC9893984 DOI: 10.1038/s41467-023-35924-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 01/09/2023] [Indexed: 02/04/2023] Open
Abstract
Modifiers are commonly used in natural, biological, and synthetic crystallization to tailor the growth of diverse materials. Here, we identify tautomers as a new class of modifiers where the dynamic interconversion between solute and its corresponding tautomer(s) produces native crystal growth inhibitors. The macroscopic and microscopic effects imposed by inhibitor-crystal interactions reveal dual mechanisms of inhibition where tautomer occlusion within crystals that leads to natural bending, tunes elastic modulus, and selectively alters the rate of crystal dissolution. Our study focuses on ammonium urate crystallization and shows that the keto-enol form of urate, which exists as a minor tautomer, is a potent inhibitor that nearly suppresses crystal growth at select solution alkalinity and supersaturation. The generalizability of this phenomenon is demonstrated for two additional tautomers with relevance to biological systems and pharmaceuticals. These findings offer potential routes in crystal engineering to strategically control the mechanical or physicochemical properties of tautomeric materials.
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41
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Dey D, Seth SK, Mohan T, Chopra D. Quantitative analysis of intermolecular interactions in crystalline substituted triazoles. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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42
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Thomas NW, Hughes DS. A rod- and tessellation-based comparative analysis of polymorphic and structurally-invariant molecular crystals: application to sulfathiazole and 2-benzyl-5-benzylidenecyclopentanones. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2023; 79:3-23. [PMID: 36748894 DOI: 10.1107/s205252062201160x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022]
Abstract
A rationalization of the alternative crystal structures adopted by a given molecular compound or by a set of substitutionally related molecular compounds is provided by reference to the five known polymorphs of sulfathiazole and 16 substituted 2-benzyl-5-benzylidene cyclopentanones (BBCPs), respectively. Two-dimensional (2D) packing fractions (ϕ2D) take space-group symmetry into account, with a clear demarcation of closed-packed zones (CPZ) and molecular junction zones (JZ) in all Z' = 1 structures. Representation of the molecules as two linked rods allows a concise treatment of conformation and rapid visualization of crystal packing. Combined with calculations of intermolecular potential energies, the rod method provides insight into the stabilization mechanisms of alternative polymorphs. In sulfathiazole, the primary factor is to obtain satisfactory hydrogen bonding, with close packing a secondary consideration. In BBCP derivatives, by comparison, close packing is the primary mechanism of stabilization. Whereas the 2D structures arising in CPZ can be analysed as tessellations of molecular-based cells, a method based on 2D Dirichlet cells is required for the JZ. These are calculated from the centroids of the molecular envelopes in high-symmetry planes. It is shown that these centroid coordinates, when combined with space-group symmetry and unit cell coordinates, provide a concise parameterization of all structures containing JZ. It is anticipated that this parameterization may be exploited to predict such crystal structures from powder diffraction data.
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Affiliation(s)
- Noel W Thomas
- Werkstofftechnik Glas & Keramik, Hochschule Koblenz, Rheinstrasse 56, 56203 Hoehr-Grenzhausen, Germany
| | - David S Hughes
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
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43
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Awwadi FF, Alwahsh MI, Turnbull MM, Landee CP. Halogen bond and polymorphism in trans-bis(2-iodo-5-halopyridine)dihalocopper( ii) complexes: crystallographic, theoretical and magnetic studies. CrystEngComm 2023. [DOI: 10.1039/d2ce01711c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
As the halogen atom on position 5 of the 2I5YP ligand gets heavier the probability of crystallizing the syn-conformer increases; 2I5Cl-Cl crystallizes as the anti-conformer whereas 2I5Br-Cl crystallizes as syn- and anti-conformers.
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44
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Taiwaikuli M, Wang T, Chen K, Feng Y, Xing J, Huang X, Wang N, Zhou L, Hao H. Mechanistic study of the formation of arbutin polymorphs and solvates. CrystEngComm 2023. [DOI: 10.1039/d2ce01670b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
Six solid forms of arbutin are successfully obtained and four single crystal structures are reported for the first time. Further, the formation mechanism of arbutin solvates is proposed and rationalized.
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Affiliation(s)
- Mukaidaisi Taiwaikuli
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Ting Wang
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Kui Chen
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yaoguang Feng
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Jiangna Xing
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Xin Huang
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Na Wang
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Lina Zhou
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Hongxun Hao
- National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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Saha BK, Nath NK, Thakuria R. Polymorphs with Remarkably Distinct Physical and/or Chemical Properties. CHEM REC 2023; 23:e202200173. [PMID: 36166697 DOI: 10.1002/tcr.202200173] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 08/30/2022] [Indexed: 01/21/2023]
Abstract
Polymorphism in crystals is known since 1822 and the credit goes to Mitscherlich who realized the existence of different crystal structures of the same compound while working with some arsenate and phosphate salts. Later on, this phenomenon was observed also in organic crystals. With the advent of different technologies, especially the easy availability of single crystal XRD instruments, polymorphism in crystals has become a common phenomenon. Almost 37 % of compounds (single component) are polymorphic to date. As the energies of the different polymorphic forms are very close to each other, small changes in crystallization conditions might lead to different polymorphic structures. As a result, sometimes it is difficult to control polymorphism. For this reason, it is considered to be a nuisance to crystal engineering. It has been realized that the property of a material depends not only on the molecular structure but also on its crystal structure. Therefore, it is not only of interest to academia but also has widespread applications in the materials science as well as pharmaceutical industries. In this review, we have discussed polymorphism which causes significant changes in materials properties in different fields of solid-state science, such as electrical, magnetic, SHG, thermal expansion, mechanical, luminescence, color, and pharmaceutical. Therefore, this review will interest researchers from supramolecular chemistry, materials science as well as medicinal chemistry.
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Affiliation(s)
- Binoy K Saha
- Department of Chemistry, Pondicherry University, Puducherry, 605014, India
| | - Naba K Nath
- Department of Chemistry, National Institute of Technology Meghalaya, Shillong, Meghalaya 793003, India
| | - Ranjit Thakuria
- Department of Chemistry, Gauhati University, Guwahati, 781014, India
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46
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Xu J, Chen A, Cai T. Polymorphism of Purpurin and Low-level Detection of the Noncentrosymmetric form by Second Harmonic Generation Microscopy. J Pharm Sci 2023; 112:282-289. [PMID: 36257339 DOI: 10.1016/j.xphs.2022.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 10/08/2022] [Accepted: 10/09/2022] [Indexed: 12/23/2022]
Abstract
Nonlinear optical imaging based on second harmonic generation (SHG) provides rapid and highly selective detection of polar crystals. Purpurin (PUR) is a natural product with multiple pharmacological activities. Two polymorphs of PUR show distinct crystal packing and structural symmetry, where form I crystallizes in a polar space group and form II crystallizes in a centrosymmetric crystal structure. The two polymorphs are monotropically related, with form I being the thermodynamically stable form, as suggested by slurry experiments, in-situ Raman spectroscopy and crystal structure prediction (CSP). The specificity of SHG to the polar crystals of form I allows rapid polymorphism detection at the limit of individual crystals. SHG is also able to detect low levels of form I in a tablet matrix dominated by amorphous excipients. This study shows that SHG microscopy can achieve the rapid and sensitive detection of noncentrosymmetric crystals in solid dosage forms, which is especially helpful for the early detection of unwanted polymorphic conversion or crystallization of amorphous drugs in formulations and final products.
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Affiliation(s)
- Jia Xu
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China; School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, China
| | - An Chen
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Ting Cai
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China.
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47
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Saravanan K, Sugarthi S, Suganya S, Kumaradhas P. Probing the intermolecular interactions, binding affinity, charge density distribution and dynamics of silibinin in dual targets AChE and BACE1: QTAIM and molecular dynamics perspective. J Biomol Struct Dyn 2022; 40:12880-12894. [PMID: 34637680 DOI: 10.1080/07391102.2021.1977699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Alzheimer's disease (AD) is the grievous neurodegenerative disorder. Reportedly, many enzymes are responsible for this disease, in which notably, acetylcholinesterase (AChE) and β-secretase (BACE1) are largely involved for AD. An experimental study reports that silibinin molecule inhibits both AChE and BACE1 enzymes. Present study aims to understand the dual binding mechanism of silibinin in the active site of AChE and BACE1 from the intermolecular interactions, conformational flexibility, charge density distribution, binding energy and the stability of molecule. To obtain the above information, the molecular docking, molecular dynamics (MD) and QTAIM (quantum theory of atoms in molecules) calculations have been performed. The molecular docking reveals that silibinin molecule is forming strong and weak intermolecular interactions with the catalytic site of both enzymes. The QTAIM analysis for the binding pockets of both complexes shows the charge density distribution of intermolecular interactions. The electrostatic potential map displays the electronegative/positive regions at the interaction zone of silibinin with AChE and BACE1 complexes. The MD simulation confirms that the silibinin molecule is stable in the active site of AChE and BACE1 enzymes. The binding free energies of silibinin with both enzymes are more favorable to have the interactions.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Kandasamy Saravanan
- Laboratory of Biocrystallography and Computational Molecular Biology, Department of Physics, Periyar University, Salem, India.,Faculty of Chemistry, University of Warsaw, Warsaw, Poland
| | - Srinivasan Sugarthi
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, India
| | - Suresh Suganya
- Laboratory of Biocrystallography and Computational Molecular Biology, Department of Physics, Periyar University, Salem, India
| | - Poomani Kumaradhas
- Laboratory of Biocrystallography and Computational Molecular Biology, Department of Physics, Periyar University, Salem, India
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48
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Gawdzik B, Bukowska-Śluz I, Koziol AE, Mazur L. Synthesis and Characterization of Biodegradable Polymers Based on Glucose Derivatives. MATERIALS (BASEL, SWITZERLAND) 2022; 16:253. [PMID: 36614592 PMCID: PMC9822088 DOI: 10.3390/ma16010253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 12/21/2022] [Accepted: 12/24/2022] [Indexed: 06/17/2023]
Abstract
Syntheses of two new monomers, namely the glucose derivatives 2,3,4,6-tetra-O-acetyl-1 methacryloyl-glucopyranose (MGlc) and 2,3,4,6 tetra-O-acetyl-1-acryloylglucopyranose (AGlc), are presented. Their chemical structures were determined by the FTIR, 1H and 13C NMR spectroscopies, the single-crystal X-ray analysis, supported by the powder X-ray diffraction, and the DSC analyses. Molecules of both monomers exist in the β-anomeric form in the solid state. The variable temperature X-ray diffraction studies, supported by the DSC analyses, revealed AGlc's propensity for polymorphism and temperature-induced phase transitions. MGlc and AGlc crystallised from methanol were polymerized or copolymerized with methyl methacrylate and N-vinylpyrrolidone. The biodegradabilities of polymers as well as thermal and optical properties were studied. The results show that some properties of the obtained homopolymers and copolymers resemble those of PMMA. The main difference is that the AGlc and MGlc homopolymers are biodegradable while PMMA is not. The ternary copolymers, i.e., MGlc/AGlc-MMA-NVP lose more than 10% of their weight after six months.
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Hamide M, Gök Y, Demir Y, Sevinçek R, Taskin-Tok T, Tezcan B, Aktaş A, Gülçin İ, Aygün M, Güzel B. Benzimidazolium Salts Containing Trifluoromethoxybenzyl: Synthesis, Characterization, Crystal Structure, Molecular Docking Studies and Enzymes Inhibitory Properties. Chem Biodivers 2022; 19:e202200257. [PMID: 36260838 DOI: 10.1002/cbdv.202200257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 10/19/2022] [Indexed: 01/07/2023]
Abstract
The method for producing 4-trifluoromethoxybenzyl substituted benzimidazolium salts is described in this article. The method is based on the reaction of 4-trifluoromethoxybenzyl substituent alkylating agent with 1-alkylbenzimidazole. This method yielded 1-(4-trifluoromethoxybenzyl)-3-alkylbenzimidazolium bromide salts. These benzimidazolium salts were characterized by using 1 H-NMR, 13 C-NMR, FT-IR spectroscopy, and elemental analysis techniques. The crystal structure of 1f was enlightened by single crystal X-ray diffraction studies. Also, the enzyme inhibition effects of the synthesised compounds were investigated. They demonstrated highly potent inhibition effect on acetylcholinesterase (AChE) and carbonic anhydrases (hCAs) (Ki values are in the range of 7.24±0.99 to 39.12±5.66 nM, 5.57±0.96 to 43.07±11.76 nM, and 4.38±0.43 to 18.68±3.60 nM for AChE, hCA I, and hCA II, respectively). In molecular docking study, the interactions of active compounds showing activity against AChE and hCAs enzymes were examined. The most active compound 1f has -10.90 kcal/mol binding energy value against AChE enzyme, and the potential structure compound 1e, which has activity against hCA I and hCA II enzymes, was -7.51 and -8.93 kcal/mol, respectively.
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Affiliation(s)
- Mahmut Hamide
- Department of Chemistry, Faculty of Arts and Science, Cukurova University, 01330-, Adana, Türkiye
| | - Yetkin Gök
- Department of Chemistry, Faculty of Arts and Science, Inönü University, 44280-, Malatya, Türkiye
| | - Yeliz Demir
- Nihat Delibalta Göle Vocational High School, Ardahan University, 75700-, Ardahan, Türkiye
| | - Resul Sevinçek
- Dokuz Eylül University, Faculty of Science, Department of Physics, 35160-, Buca, İzmir, Türkiye
| | - Tugba Taskin-Tok
- Department of Chemistry, Faculty of Arts and Sciences, Gaziantep University, 27310-, Gaziantep, Türkiye.,Department of Bioinformatics and Computational Biology, Institute of Health Sciences, Gaziantep University, 27310-, Gaziantep, Türkiye
| | - Burcu Tezcan
- Department of Chemistry, Faculty of Arts and Science, Cukurova University, 01330-, Adana, Türkiye
| | - Aydın Aktaş
- Vocational School of Health Service, Inonu University, 44280-, Malatya, Türkiye
| | - İlhami Gülçin
- Department of Chemistry, Faculty of Science, Atatürk University, 25240-, Erzurum, Türkiye
| | - Muhittin Aygün
- Dokuz Eylül University, Faculty of Science, Department of Physics, 35160-, Buca, İzmir, Türkiye
| | - Bilgehan Güzel
- Department of Chemistry, Faculty of Arts and Science, Cukurova University, 01330-, Adana, Türkiye
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Jin S, Haskins MM, Andaloussi YH, Ouyang R, Gong J, Zaworotko MJ. Conformational Trimorphism in an Ionic Cocrystal of Hesperetin. CRYSTAL GROWTH & DESIGN 2022; 22:6390-6397. [PMID: 36345389 PMCID: PMC9634790 DOI: 10.1021/acs.cgd.2c00861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/16/2022] [Indexed: 06/16/2023]
Abstract
We report the existence of conformational polymorphism in an ionic cocrystal (ICC) of the nutraceutical compound hesperetin (HES) in which its tetraethylammonium (TEA+) salt serves as a coformer. Three polymorphs, HESTEA-α, HESTEA-β and HESTEA-γ, were characterized by single-crystal X-ray diffraction (SCXRD). Each polymorph was found to be sustained by phenol···phenolate supramolecular heterosynthons that self-assemble with phenol···phenol supramolecular homosynthons into C 3 2(7) H-bonded motifs. Conformational variability in HES moieties and different relative orientations of the H-bonded motifs resulted in distinct crystal packing patterns: HESTEA-α and HESTEA-β exhibit H-bonded sheets; HESTEA-γ is sustained by bilayers of H-bonded tapes. All three polymorphs were found to be stable upon exposure to humidity under accelerated stability conditions for 2 weeks. Under competitive slurry conditions, HESTEA-α was observed to transform to the β or γ forms. Solvent selection impacted the relationship between HESTEA-β (favored in EtOH) and HESTEA-γ (favored in MeOH). A mixture of the β and γ forms was found to be present following H2O slurry.
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Affiliation(s)
- Shasha Jin
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Molly M. Haskins
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Yassin H. Andaloussi
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Ruiling Ouyang
- State
Key Laboratory of Chemical Engineering, School of Chemical Engineering
and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Junbo Gong
- State
Key Laboratory of Chemical Engineering, School of Chemical Engineering
and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Michael J. Zaworotko
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
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