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Vardaka E, Andreas O, Nikolakakis I, Kachrimanis K. Development of agomelatine nanocomposite formulations by wet media milling. Eur J Pharm Sci 2021; 166:105979. [PMID: 34425232 DOI: 10.1016/j.ejps.2021.105979] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/30/2021] [Accepted: 08/17/2021] [Indexed: 11/19/2022]
Abstract
Nanocrystal formulations of the BCS class II agomelatine, were developed by wet media milling. The most suitable stabilizer was identified and effects of process and formulation variables on the nanocrystal size and ζ-potential were evaluated employing a Box-Behnken experimental design. The optimized nanosuspensions were dried and subsequently evaluated for redispersibility and physicochemical properties. Computational simulation of solid state properties was applied to rationalize crystal fracture. It was found that low viscosity hydroxypropylcellulose with sodium dodecyl sulfate is the most suitable stabilizer. Stabilizer concentration exerts a statistically significant effect on particle size, which depends on the mill's rotation speed. The milling process induces a polymorphic transition to form II, which could affect size reduction kinetics. The solidified nanosuspensions' redispersibility is deteriorating progressively with storage time, with only minor differences between drying methods, retaining enhanced dissolution rate. Crystal lattice simulations suggest high mechanical anisotropy of form I crystals, which could be an additional reason for fast particle size reduction prior to the polymorphic transformation. Wet media milling, combined with a suitable drying method, can be an efficient technique for the production of stable nanocrystals of agomelatine. Particle informatics methods can enhance our understanding of the mechanisms responsible for agomelatine's nanocomminution.
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Affiliation(s)
- Elisavet Vardaka
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Ouranidis Andreas
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Chemical Engineering Department, Faculty of Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Ioannis Nikolakakis
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Kyriakos Kachrimanis
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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2
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Tian J, Qiao F, Hou Y, Tian B, Yang J. Exploring space-energy matching via quantum-molecular mechanics modeling and breakage dynamics-energy dissipation via microhydrodynamic modeling to improve the screening efficiency of nanosuspension prepared by wet media milling. Expert Opin Drug Deliv 2021; 18:1643-1657. [PMID: 34382869 DOI: 10.1080/17425247.2021.1967928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Introduction: The preparation of nanosuspensions by wet media milling is a promising technique that increases the bioavailability of insoluble drugs. The nanosuspension is thermodynamically unstable, where its stability might be influenced by the interaction energy between the stabilizers and the drugs after milling at a specific collision energy. However, it is difficult to screen the stabilizers and the parameters of milling accurately and quickly by using traditional analysis methods. Quantum-molecular mechanics and microhydrodynamic modeling can be applied to improve screening efficiency.Areas covered: Quantum-molecular mechanics model, which includes molecular docking, molecular dynamics simulations, and data on binding energy, provides insights into screening stabilizers based on their molecular behavior at the atomic level. The microhydrodynamic model explores the mechanical processes and energy dissipation in nanomilling, and even combines information on the mechanical modulus and an energy vector diagram for the milling parameters screening of drug crystals.Expert opinion: These modeling methods improve screening efficiency and support screening theories based on thermodynamics and physical dynamics. However, how to reasonably combine different modeling methods with their theoretical characteristics and further multidimensional and cross-scale simulations of nanosuspension formation remain challenges.
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Affiliation(s)
- Jing Tian
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, P R China
| | - Fangxia Qiao
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, P R China
| | - Yanhui Hou
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, P R China
| | - Bin Tian
- Department of Pharmaceutical Sciences, School of Food and Biological Engineering, Shanxi University of Science and Technology, Weiyang University Park, Xi'an, P R China
| | - Jianhong Yang
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, P R China
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3
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Development of a Nanocrystal Formulation of a Low Melting Point API Following a Quality by Design Approach. Processes (Basel) 2021. [DOI: 10.3390/pr9060954] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Preparation of nanocrystal formulations by wet media milling and spray-drying is a reliable technique to enhance dissolution and ameliorate absorption limitations of poorly soluble BCS II drugs. However, when thermosensitive compositions are dried at high temperatures, the risks of particle aggregation and thermal degradation must be considered. The present study investigates the effects of nanosuspension formulation variables when performing the spray drying process at equidistant temperatures above and below the melting point. Towards this purpose, Fenofibrate is exploited as a model drug of unfavorable pharmacokinetic profile and low melting point (79–82 °C), properties that render thermal processing a nontrivial task. Rationalizing the system’s behavior by combining molecular simulations with QbD methodology, the preparation of stable nanocrystals can be “steered” in order to avoid undesirable melting. The statistically resolved operational conditions showed that Fenofibrate Critical Quality Attribute–compliant nanosuspensions i.e., bearing hydrodynamic diameter and ζ-potential of 887 nm and −16.49 mV, respectively, were obtained by wet milling drug to Pharmacoat and mannitol weighted optimum ratios of 4.075% and 0.75%, after spray drying at the desired temperature of 77 °C. In conclusion, we present a quality assurance methodology of nano-comminution generally applicable for thermo-labile BCS II drugs.
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4
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Bahl D, Young BA, Stevens LL. Elastic anisotropy of mechanically responsive molecular solids. CrystEngComm 2021. [DOI: 10.1039/d1ce00542a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unique mechanical properties in molecular solids arise from a specific combination of structure and interaction anisotropy. Powder Brillouin light scattering offers new insight into the latter contribution to test current models for mechanical design.
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Affiliation(s)
- Dherya Bahl
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, The University of Iowa, Iowa City, IA 52242, USA
| | - Beth A. Young
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, The University of Iowa, Iowa City, IA 52242, USA
| | - Lewis L. Stevens
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, The University of Iowa, Iowa City, IA 52242, USA
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Overcoming the Solubility Barrier of Ibuprofen by the Rational Process Design of a Nanocrystal Formulation. Pharmaceutics 2020; 12:pharmaceutics12100969. [PMID: 33066680 PMCID: PMC7602516 DOI: 10.3390/pharmaceutics12100969] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/04/2020] [Accepted: 10/10/2020] [Indexed: 12/21/2022] Open
Abstract
Wet media milling, coupled with spay drying, is a commonly proposed formulation strategy for the production and solidification of nanosuspensions in order to overcome the solubility barrier of BCS Class II substances. However, the application of mechanically and thermally intensive processes is not straightforward in the cases of ductile and/or low melting point substances that may additionally be susceptible to eutectic formation. Using ibuprofen (IBU) as a model drug with non-favorable mechanical and melting properties, we attempt to rationalize nanocrystal formulation and manufacturing in an integrated approach by implementing Quality by Design (QbD) methodology, particle informatics techniques and computationally assisted process design. Wet media milling was performed in the presence of different stabilizers and co-milling agents, and the nanosuspensions were solidified by spray-drying. The effects of key process parameters (bead diameter, milling time and rotational speed) and formulation variables (stabilizer type and drug/stabilizer ratio) on the critical quality attributes (CQAs), i.e., Z-average size, polydispersity index (PDI), ζ-potential and redispersibility of spray-dried nanosuspensions were evaluated, while possible correlations between IBU free surface energy and stabilizer effectiveness were studied. The fracture mechanism and surface stabilization of IBU were investigated by computer simulation of the molecular interactions at the crystal lattice level. As a further step, process design accounting for mass-energy balances and predictive thermodynamic models were constructed to scale-up and optimize the design space. Contemplating several limitations, our multilevel approach offers insights on the mechanistic pathway applicable to the substances featuring thermosensitivity and eutectic tendency.
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Insight into the Formation of Glimepiride Nanocrystals by Wet Media Milling. Pharmaceutics 2020; 12:pharmaceutics12010053. [PMID: 31936609 PMCID: PMC7022670 DOI: 10.3390/pharmaceutics12010053] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 12/29/2019] [Accepted: 01/08/2020] [Indexed: 12/02/2022] Open
Abstract
Nanocrystal formation for the dissolution enhancement of glimepiride was attempted by wet media milling. Different stabilizers were tested and the obtained nanosuspensions were solidified by spray drying in presence of mannitol, and characterized regarding their redispersibility by dynamic light scattering, physicochemical properties by differential scanning calorimetry (DSC), FT-IR spectroscopy, powder X-ray diffraction (PXRD), and scanning electron microcopy (SEM), as well as dissolution rate. Lattice energy frameworks combined with topology analysis were used in order to gain insight into the mechanisms of particle fracture. It was found that nanosuspensions with narrow size distribution can be obtained in presence of poloxamer 188, HPC-SL and Pharmacoat® 603 stabilizers, with poloxamer giving poor redispersibility due to melting and sticking of nanocrystals during spray drying. DSC and FT-IR studies showed that glimepiride does not undergo polymorphic transformations during processing, and that the milling process induces changes in the hydrogen bonding patterns of glimepiride crystals. Lattice energy framework and topology analysis revealed the existence of a possible slip plane on the (101) surface, which was experimentally verified by PXRD analysis. Dissolution testing proved the superior performance of nanocrystals, and emphasized the important influence of the stabilizer on the dissolution rate of the nanocrystals.
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7
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Singh A, Torubaev Y, Ansari SN, Singh SK, Mobin SM, Mathur P. The borderline: exploring the structural landscape of triptycene in cocrystallization with ferrocene. CrystEngComm 2020. [DOI: 10.1039/c9ce01734h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
When the effective packing of triptycene (TripH)–ferrocene chain oligomers in their cocrystal could not be achieved, we reached a borderline at the structural landscape of TripH, where the packing of TripH molecules reproduces the pattern in the native TripH crystal.
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Affiliation(s)
- Ajeet Singh
- Discipline of Chemistry
- Indian Institute of Technology Indore
- India
| | - Yury Torubaev
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
| | | | - Sandip K. Singh
- Discipline of Chemistry
- Indian Institute of Technology Indore
- India
| | - Shaikh M. Mobin
- Discipline of Chemistry
- Indian Institute of Technology Indore
- India
- Discipline of Metallurgy Engineering and Materials Science
- Indian Institute of Technology Indore
| | - Pradeep Mathur
- Discipline of Chemistry
- Indian Institute of Technology Indore
- India
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8
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9
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Commins P, Karothu DP, Naumov P. Is a Bent Crystal Still a Single Crystal? Angew Chem Int Ed Engl 2019; 58:10052-10060. [PMID: 30762922 DOI: 10.1002/anie.201814387] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Indexed: 11/10/2022]
Abstract
The mention of the word "crystal" invokes images of minerals, gems, and rocks, all of which are inevitably solid, hard, and durable entities with well-defined smooth faces and straight edges. With the discovery in the first half of the 20th century that many molecular crystals are soft and can be deformed in a similar way as rubber or plastic, this perception is changing, and both the concept and formal definition of what a crystal is may require reinterpretation. The seemingly naïve question posed in the title of this Minireview does not have a simple answer. Here, we discuss how the effects of the elastic and plastic deformation of molecular crystals on the diffraction signature give primary evidence of their degree of crystallinity. In most cases, the definition of a crystal holds for both elastically and plastically deformed crystals and, unless there is significant or complete physical separation of the crystal during the deformation, they can safely be considered (deformed) single crystals with a high concentration of defects.
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Affiliation(s)
- Patrick Commins
- New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates
| | | | - Panče Naumov
- New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates.,Radcliffe Institute for Advanced Study, Harvard University, 10 Garden Street, Cambridge, MA, 02138, USA
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10
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Commins P, Karothu DP, Naumov P. Ist ein gebogener Kristall immer noch ein Einkristall? Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814387] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Patrick Commins
- New York University Abu Dhabi P.O. Box 129188 Abu Dhabi Vereinigte Arabische Emirate
| | - Durga Prasad Karothu
- New York University Abu Dhabi P.O. Box 129188 Abu Dhabi Vereinigte Arabische Emirate
| | - Panče Naumov
- New York University Abu Dhabi P.O. Box 129188 Abu Dhabi Vereinigte Arabische Emirate
- Radcliffe Institute for Advanced StudyHarvard University 10 Garden St. Cambridge MA 02138 USA
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11
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Torubaev YV, Rai DK, Skabitsky IV, Pakhira S, Dmitrienko A. Energy framework approach to the supramolecular reactions: interplay of the secondary bonding interaction in Ph2E2 (E = Se, Te)/p-I-C6F4-I co-crystals. NEW J CHEM 2019. [DOI: 10.1039/c9nj00347a] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Persistent packing patterns found in pure diorgano-dichalcogenides (Ph2E2) and their co-crystals suggest new, energy-based visualization and description of co-crystal formation.
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Affiliation(s)
- Yury V. Torubaev
- N. S. Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russia
| | - Dhirendra K. Rai
- Discipline of Metallurgy Engineering and Materials Science
- Indian Institute of Technology
- Simrol
- Indore
- India
| | - Ivan V. Skabitsky
- N. S. Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russia
| | - Srimanta Pakhira
- Discipline of Metallurgy Engineering and Materials Science
- Indian Institute of Technology
- Simrol
- Indore
- India
| | - Artem Dmitrienko
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
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12
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SeethaLekshmi S, Kiran MSRN, Ramamurty U, Varughese S. Molecular Basis for the Mechanical Response of Sulfa Drug Crystals. Chemistry 2018; 25:526-537. [DOI: 10.1002/chem.201803987] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Indexed: 01/28/2023]
Affiliation(s)
- Sunil SeethaLekshmi
- Chemical Science and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology Trivandrum 695 019 India
| | - Mangalampalli S. R. N. Kiran
- Nanomechanics Laboratory, Department of Physics and NanotechnologySRM Institute of Science and Technology Chennai 603203 India
| | - Upadrasta Ramamurty
- School of Mechanical & Aerospace EngineeringNanyang Technological University Singapore 639798 Singapore
| | - Sunil Varughese
- Chemical Science and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology Trivandrum 695 019 India
- Academy of Scientific and Innovative Research, CSIR-NIIST Campus Trivandrum 695 019 India
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13
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Devi K, Sarma RJ. Naphthalimide-Containing Isomeric Urea Derivatives: Mechanoluminescence and Fluoride Recognition. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kakali Devi
- Department of Chemistry; Gauhati University; Guwahati 781014 Assam India
| | - Rupam J Sarma
- Department of Chemistry; Gauhati University; Guwahati 781014 Assam India
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14
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Pejov L, Panda MK, Moriwaki T, Naumov P. Probing Structural Perturbation in a Bent Molecular Crystal with Synchrotron Infrared Microspectroscopy and Periodic Density Functional Theory Calculations. J Am Chem Soc 2017; 139:2318-2328. [DOI: 10.1021/jacs.6b11212] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ljupčo Pejov
- Institute
of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, MK−1000 Skopje, Macedonia
| | - Manas K. Panda
- New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates
| | - Taro Moriwaki
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Panče Naumov
- Institute
of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, MK−1000 Skopje, Macedonia
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15
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Dey D, Chopra D. Occurrence of 3D isostructurality in fluorinated phenyl benzamidines. CrystEngComm 2017. [DOI: 10.1039/c6ce01924b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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16
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Edwards AJ, Mackenzie CF, Spackman PR, Jayatilaka D, Spackman MA. Intermolecular interactions in molecular crystals: what’s in a name? Faraday Discuss 2017; 203:93-112. [DOI: 10.1039/c7fd00072c] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Structure–property relationships are the key to modern crystal engineering, and for molecular crystals this requires both a thorough understanding of intermolecular interactions, and the subsequent use of this to create solids with desired properties. There has been a rapid increase in publications aimed at furthering this understanding, especially the importance of non-canonical interactions such as halogen, chalcogen, pnicogen, and tetrel bonds. Here we show how all of these interactions – and hydrogen bonds – can be readily understood through their common origin in the redistribution of electron density that results from chemical bonding. This redistribution is directly linked to the molecular electrostatic potential, to qualitative concepts such as electrostatic complementarity, and to the calculation of quantitative intermolecular interaction energies. Visualization of these energies, along with their electrostatic and dispersion components, sheds light on the architecture of molecular crystals, in turn providing a link to actual crystal properties.
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Affiliation(s)
- Alison J. Edwards
- Australian Centre for Neutron Scattering
- Australian Nuclear Science and Technology Organization
- Lucas Heights
- Australia
| | | | - Peter R. Spackman
- School of Molecular Sciences
- University of Western Australia
- Perth
- Australia
| | - Dylan Jayatilaka
- School of Molecular Sciences
- University of Western Australia
- Perth
- Australia
| | - Mark A. Spackman
- School of Molecular Sciences
- University of Western Australia
- Perth
- Australia
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17
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Affiliation(s)
- A. Subha Mahadevi
- Centre for Molecular Modelling, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, India 500607
| | - G. Narahari Sastry
- Centre for Molecular Modelling, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, India 500607
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19
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Dolgushin FM, Smol’yakov AF, Suponitsky KY, Vologzhanina AV, Fedyanin IV, Shishkina SV. Intermolecular interactions in polymorphs of the cyclic trimeric perfluoro-ortho-phenylene mercury from geometric, energetic and AIM viewpoints: DFT study and Hirshfeld surface analysis. Struct Chem 2015. [DOI: 10.1007/s11224-015-0646-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Turner MJ, Thomas SP, Shi MW, Jayatilaka D, Spackman MA. Energy frameworks: insights into interaction anisotropy and the mechanical properties of molecular crystals. Chem Commun (Camb) 2015; 51:3735-8. [PMID: 25525647 DOI: 10.1039/c4cc09074h] [Citation(s) in RCA: 346] [Impact Index Per Article: 38.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We present an approach to understanding crystal packing via 'energy frameworks', that combines efficient calculation of accurate intermolecular interaction energies with a novel graphical representation of their magnitude. In this manner intriguing questions, such as why some crystals bend with an applied force while others break, and why one polymorph of a drug exhibits exceptional tabletability compared to others, can be addressed in terms of the anisotropy of the topology of pairwise intermolecular interaction energies. This approach is applied to a sample of organic molecular crystals with known bending, shearing and brittle behaviour, to illustrate its use in rationalising their mechanical behaviour at a molecular level.
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Affiliation(s)
- Michael J Turner
- School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA, Australia.
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21
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Maschke M, Merz K, Shishkin OV, Zubatyuk RI, Metzler-Nolte N. Influence of chlorine substituents on the aggregation behavior of chlorobenzoyl-substituted ferrocene derivates. Struct Chem 2015. [DOI: 10.1007/s11224-015-0587-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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22
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Turner MJ, Grabowsky S, Jayatilaka D, Spackman MA. Accurate and Efficient Model Energies for Exploring Intermolecular Interactions in Molecular Crystals. J Phys Chem Lett 2014; 5:4249-55. [PMID: 26273970 DOI: 10.1021/jz502271c] [Citation(s) in RCA: 263] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The energy of interaction between molecules is commonly expressed in terms of four key components: electrostatic, polarization, dispersion, and exchange-repulsion. Using monomer wave functions to obtain accurate estimates of electrostatic, polarization, and repulsion energies along with Grimme's dispersion corrections, a series of energy models are derived by fitting to dispersion-corrected DFT energies for a large number of molecular pairs extracted from organic and inorganic molecular crystals. The best performing model reproduces B3LYP-D2/6-31G(d,p) counterpoise-corrected energies with a mean absolute deviation (MAD) of just over 1 kJ mol(-1) but in considerably less computation time. It also performs surprisingly well against benchmark CCSD(T)/CBS energies, with a MAD of 2.5 kJ mol(-1) for a combined data set including Hobza's X40, S22, A24, and S66 dimers. Two of these energy models, the most accurate and the fastest, are expected to find widespread application in investigations of molecular crystals.
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23
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Bond AD. processPIXEL: a program to generate energy-vector models from Gavezzotti'sPIXELcalculations. J Appl Crystallogr 2014. [DOI: 10.1107/s1600576714016446] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A command-line program is presented to convert the output from Gavezzotti'sPIXELcalculations to Shishkin's energy-vector models representing the intermolecular interaction topology. The output models comprise sets of vectors joining the centres of the molecules in a crystal structure, scaled so that the vector representing the most stabilizing pairwise interaction has length equal to half of the corresponding intermolecular separation. When the energy-vector model is packed, the most stabilizing pairwise interaction is represented as a continuous line between interacting molecules, while the other intermolecular interactions are shown as discontinuous lines, with a smaller gap representing a more stabilizing interaction. The energy-vector models can be overlaid on the crystal structure using theMercuryvisualizer to enable convenient visualization of structural motifs that contribute significantly to the overall crystal packing energy.
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24
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Zubatyuk RI, Sinelshchikova AA, Enakieva YY, Gorbunova YG, Tsivadze AY, Nefedov SE, Bessmertnykh-Lemeune A, Guilard R, Shishkin OV. Insights into the crystal packing of phosphorylporphyrins based on the topology of their intermolecular interaction energies. CrystEngComm 2014. [DOI: 10.1039/c4ce01623h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Principal features of crystal packing for the series of complexes were revealed by computational approach.
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Affiliation(s)
- Roman I. Zubatyuk
- SSI “Institute for Single Crystals” National Academy of Science of Ukraine
- Kharkiv 61001, Ukraine
| | - Anna A. Sinelshchikova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow, Russia
| | - Yulia Y. Enakieva
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow, Russia
| | - Yulia G. Gorbunova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow, Russia
- N.S. Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
| | - Aslan Y. Tsivadze
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow, Russia
- N.S. Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
| | - Sergey E. Nefedov
- N.S. Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
- Moscow, Russia
| | | | - Roger Guilard
- Université de Bourgogne
- ICMUB (UMR CNRS 6302)
- 21078 Dijon Cedex, France
| | - Oleg V. Shishkin
- SSI “Institute for Single Crystals” National Academy of Science of Ukraine
- Kharkiv 61001, Ukraine
- V.N. Karazin Kharkiv National University
- Kharkiv 61202, Ukraine
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Shishkin OV, Zubatyuk RI, Shishkina SV, Dyakonenko VV, Medviediev VV. Role of supramolecular synthons in the formation of the supramolecular architecture of molecular crystals revisited from an energetic viewpoint. Phys Chem Chem Phys 2014; 16:6773-86. [DOI: 10.1039/c3cp55390f] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
How do molecules aggregate in solution, and how do these aggregates consolidate themselves in crystals? What is the relationship between the structure of a molecule and the structure of the crystal it forms? Why do some molecules adopt more than one crystal structure? Why do some crystal structures contain solvent? How does one design a crystal structure with a specified topology of molecules, or a specified coordination of molecules and/or ions, or with a specified property? What are the relationships between crystal structures and properties for molecular crystals? These are some of the questions that are being addressed today by the crystal engineering community, a group that draws from the larger communities of organic, inorganic, and physical chemists, crystallographers, and solid state scientists. This Perspective provides a brief historical introduction to crystal engineering itself and an assessment of the importance and utility of the supramolecular synthon, which is one of the most important concepts in the practical use and implementation of crystal design. It also provides a look to the future from the viewpoint of the author, and indicates some directions in which this field might be moving.
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Affiliation(s)
- Gautam R Desiraju
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India.
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