1
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Mollick S, Rai S, Frentzel‐Beyme L, Kachwal V, Donà L, Schürmann D, Civalleri B, Henke S, Tan J. Unlocking Diabetic Acetone Vapor Detection by A Portable Metal-Organic Framework-Based Turn-On Optical Sensor Device. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305070. [PMID: 38032122 PMCID: PMC10811499 DOI: 10.1002/advs.202305070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 10/21/2023] [Indexed: 12/01/2023]
Abstract
Despite exhaled human breath having enabled noninvasive diabetes diagnosis, selective acetone vapor detection by fluorescence approach in the diabetic range (1.8-3.5 ppm) remains a long-standing challenge. A set of water-resistant luminescent metal-organic framework (MOF)-based composites have been reported for detecting acetone vapor in the diabetic range with a limit of detection of 200 ppb. The luminescent materials possess the ability to selectively detect acetone vapor from a mixture comprising nitrogen, oxygen, carbon dioxide, water vapor, and alcohol vapor, which are prevalent in exhaled breath. It is noteworthy that this is the first luminescent MOF material capable of selectively detecting acetone vapor in the diabetic range via a turn-on mechanism. The material can be reused within a matter of minutes under ambient conditions. Industrially pertinent electrospun luminescent fibers are likewise fabricated alongside various luminescent films for selective detection of ultratrace quantities of acetone vapor present in the air. Ab initio theoretical calculations combined with in situ synchrotron-based dosing studies uncovered the material's remarkable hypersensitivity toward acetone vapor. Finally, a freshly designed prototype fluorescence-based portable optical sensor is utilized as a proof-of-concept for the rapid detection of acetone vapor within the diabetic range.
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Affiliation(s)
- Samraj Mollick
- Multifunctional Materials & Composites (MMC) LaboratoryDepartment of Engineering ScienceUniversity of OxfordParks RoadOxfordOX1UK
| | - Sujeet Rai
- Multifunctional Materials & Composites (MMC) LaboratoryDepartment of Engineering ScienceUniversity of OxfordParks RoadOxfordOX1UK
| | - Louis Frentzel‐Beyme
- Anorganische ChemieFakultät für Chemie & Chemische BiologieTec‐hnische Universität DortmundOtto‐Hahn Straße 644227DortmundGermany
| | - Vishal Kachwal
- Multifunctional Materials & Composites (MMC) LaboratoryDepartment of Engineering ScienceUniversity of OxfordParks RoadOxfordOX1UK
| | - Lorenzo Donà
- Department of ChemistryUniversity of TurinVia Pietro. Giuria 5Torino10125Italy
| | - Dagmar Schürmann
- Anorganische ChemieFakultät für Chemie & Chemische BiologieTec‐hnische Universität DortmundOtto‐Hahn Straße 644227DortmundGermany
| | | | - Sebastian Henke
- Anorganische ChemieFakultät für Chemie & Chemische BiologieTec‐hnische Universität DortmundOtto‐Hahn Straße 644227DortmundGermany
| | - Jin‐Chong Tan
- Multifunctional Materials & Composites (MMC) LaboratoryDepartment of Engineering ScienceUniversity of OxfordParks RoadOxfordOX1UK
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2
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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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3
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Erba A, Desmarais JK, Casassa S, Civalleri B, Donà L, Bush IJ, Searle B, Maschio L, Edith-Daga L, Cossard A, Ribaldone C, Ascrizzi E, Marana NL, Flament JP, Kirtman B. CRYSTAL23: A Program for Computational Solid State Physics and Chemistry. J Chem Theory Comput 2023; 19:6891-6932. [PMID: 36502394 PMCID: PMC10601489 DOI: 10.1021/acs.jctc.2c00958] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Indexed: 12/14/2022]
Abstract
The Crystal program for quantum-mechanical simulations of materials has been bridging the realm of molecular quantum chemistry to the realm of solid state physics for many years, since its first public version released back in 1988. This peculiarity stems from the use of atom-centered basis functions within a linear combination of atomic orbitals (LCAO) approach and from the corresponding efficiency in the evaluation of the exact Fock exchange series. In particular, this has led to the implementation of a rich variety of hybrid density functional approximations since 1998. Nowadays, it is acknowledged by a broad community of solid state chemists and physicists that the inclusion of a fraction of Fock exchange in the exchange-correlation potential of the density functional theory is key to a better description of many properties of materials (electronic, magnetic, mechanical, spintronic, lattice-dynamical, etc.). Here, the main developments made to the program in the last five years (i.e., since the previous release, Crystal17) are presented and some of their most noteworthy applications reviewed.
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Affiliation(s)
- Alessandro Erba
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Jacques K. Desmarais
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Silvia Casassa
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Bartolomeo Civalleri
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Lorenzo Donà
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Ian J. Bush
- STFC
Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Barry Searle
- SFTC
Daresbury Laboratory, Daresbury, Cheshire WA4 4AD, United Kingdom
| | - Lorenzo Maschio
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Loredana Edith-Daga
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Alessandro Cossard
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Chiara Ribaldone
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Eleonora Ascrizzi
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Naiara L. Marana
- Dipartimento
di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
| | - Jean-Pierre Flament
- Université
de Lille, CNRS, UMR 8523 — PhLAM — Physique des Lasers, Atomes et Molécules, 59000 Lille, France
| | - Bernard Kirtman
- Department
of Chemistry and Biochemistry, University
of California, Santa
Barbara, California 93106, United States
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4
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Shao S, Stocker MW, Zarrella S, Korter TM, Singh A, Healy AM. In Situ Cocrystallization via Spray Drying with Polymer as a Strategy to Prevent Cocrystal Dissociation. Mol Pharm 2023; 20:4770-4785. [PMID: 37595572 PMCID: PMC10481393 DOI: 10.1021/acs.molpharmaceut.3c00564] [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: 06/30/2023] [Revised: 08/14/2023] [Accepted: 08/14/2023] [Indexed: 08/20/2023]
Abstract
The aim of the present study was to investigate how different polymers affect the dissociation of cocrystals prepared by co-spray-drying active pharmaceutical ingredient (API), coformer, and polymer. Diclofenac acid-l-proline cocrystal (DPCC) was selected in this study as a model cocrystal due to its previously reported poor physical stability in a high-humidity environment. Polymers investigated include polyvinylpyrrolidone (PVP), poly(1-vinylpyrrolidone-co-vinyl acetate) (PVPVA), hydroxypropyl methyl cellulose, hydroxypropylmethylcellulose acetate succinate, ethyl cellulose, and Eudragit L-100. Terahertz Raman spectroscopy (THz Raman) and powder X-ray diffraction (PXRD) were used to monitor the cocrystal dissociation rate in a high-humidity environment. A Raman probe was used in situ to monitor the extent of the dissociation of DPCC and DPCC in crystalline solid dispersions (CSDs) with polymer when exposed to pH 6.8 phosphate buffer and water. The solubility of DPCC and solid dispersions of DPCC in pH 6.8 phosphate buffer and water was also measured. The dissociation of DPCC was water-mediated, and more than 60% of DPCC dissociated in 18 h at 40 °C and 95% RH. Interestingly, the physical stability of the cocrystal was effectively improved by producing CSDs with polymers. The inclusion of just 1 wt % polymer in a CSD with DPCC protected the cocrystal from dissociation over 18 h under the same conditions. Furthermore, the CSD with PVPVA was still partially stable, and the CSD with PVP was stable (undissociated) after 7 days. The superior stability of DPCC in CSDs with PVP and PVPVA was also demonstrated when systems were exposed to water or pH 6.8 phosphate buffer and resulted in higher dynamic solubility of the CSDs compared to DPCC alone. The improvement in physical stability of the cocrystal in CSDs was thought to be due to an efficient mixing between polymer and cocrystal at the molecular level provided by spray drying and in situ gelling of polymer. It is hypothesized that polymer chains could undergo gelling in situ and form a physical barrier, preventing cocrystal interaction with water, which contributes to slowing down the water-mediated dissociation.
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Affiliation(s)
- ShiZhe Shao
- School
of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin D02 PN40, Ireland
- SSPC,
the Science Foundation Ireland Research Centre for Pharmaceuticals, Trinity College Dublin, Dublin D02 PN40, Ireland
| | - Michael W. Stocker
- School
of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin D02 PN40, Ireland
- SSPC,
the Science Foundation Ireland Research Centre for Pharmaceuticals, Trinity College Dublin, Dublin D02 PN40, Ireland
- School
of Chemical and Bioprocess Engineering, University College Dublin, Dublin D04 V1W8, Ireland
| | - Salvatore Zarrella
- Department
of Chemistry, Syracuse University, 1-014 Center for Science and Technology, Syracuse, New York 13244, United States
| | - Timothy M. Korter
- Department
of Chemistry, Syracuse University, 1-014 Center for Science and Technology, Syracuse, New York 13244, United States
| | | | - Anne Marie Healy
- School
of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin D02 PN40, Ireland
- SSPC,
the Science Foundation Ireland Research Centre for Pharmaceuticals, Trinity College Dublin, Dublin D02 PN40, Ireland
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5
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Zhang C, Verma P, Wang J, Liu Y, He X, Wang Y, Truhlar DG, Liu Z. Performance of Screened-Exchange Functionals for Band Gaps and Lattice Constants of Crystals. J Chem Theory Comput 2023; 19:311-323. [PMID: 36520598 DOI: 10.1021/acs.jctc.2c00822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Kohn-Sham density functional theory is the most widely used method for electronic structure calculations of solid-state systems. The screened-exchange functionals developed following the influential work of Scuseria and co-workers in 2003-2006 have significantly improved the accuracy of the predictions of solid-state properties. This work assesses six screened-exchange density functionals for the prediction of 60 band gaps (database BG60) and 68 lattice constants (database LC68). The band gaps are calculated with both consistently calculated lattice constants and experimental lattice constants. Results for the nonlocal screened-exchange functionals are compared with those for six widely used or recently developed local functionals. The results show that all the screened-exchange functionals have smaller mean absolute errors (MAEs) than any of the local functionals. All the functionals except HLE17 overestimate (on average) the lattice constants, and M06-SX gives the best performance among the compared functionals, with a MAE of 0.051 Å. All the functionals underestimate (on average) the band gaps, and M06-SX outperforms all other functionals, with a MAE of 0.47 eV. M06-SX also has the lowest root-mean-squared error for both LC68 and BG60. For the subdatabases of BG60, M06-SX shows better performance for ionic crystals and systems with large band gaps, while HSE12s gives better results for semiconductors and systems with small band gaps. Overall, M06-SX shows the best performance for solid-state systems, followed by N12-SX and HSE12s. The best-performing local functionals are M06-L, revM06-L, and HLE17 for band gaps and M06-L and revM06-L for lattice constants. We found that M06-SX, revM06-L, and N12-SX not only are well optimized for a broad array of chemical properties but also have very good performance for the databases in this paper, making them well-suited for applications involving heterogeneous chemistry.
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Affiliation(s)
- Cheng Zhang
- The National and Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410006, China
| | - Pragya Verma
- Department of Chemistry, Chemical Theory Center and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Jiaxu Wang
- The National and Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410006, China
| | - Yiwei Liu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Xiao He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Center for Computational Chemistry, New York University Shanghai, Shanghai 200062, China
| | - Ying Wang
- The National and Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410006, China
| | - Donald G Truhlar
- Department of Chemistry, Chemical Theory Center and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Zhonghua Liu
- The National and Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410006, China
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6
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Davis MP, Korter TM. Low-Frequency Vibrational Spectroscopy and Quantum Mechanical Simulations of the Crystalline Polymorphs of the Antiviral Drug Ribavirin. Mol Pharm 2022; 19:3385-3393. [PMID: 35950677 PMCID: PMC9449968 DOI: 10.1021/acs.molpharmaceut.2c00509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Crystal polymorphism is a common phenomenon in pharmaceutical
solids
and a critical issue when considering the formulation of therapeutics
since multiple polymorphs may form during drug manufacturing. Low-frequency
vibrational spectroscopy is sensitive to polymorphic content, and
in this work, terahertz time-domain spectroscopy and low-frequency
Raman spectroscopy were utilized in the study of crystalline ribavirin,
a widely applicable antiviral. Characteristic spectra with numerous
peaks in the sub-200 cm–1 region were obtained of
the more common polymorph of ribavirin (Form II). Solid-state density
functional theory (ss-DFT) simulations were then used to optimize
the crystal structure of this polymorph and calculate the frequencies
and spectral intensities of the lattice vibrations in the low-frequency
region. The near-harmonic thermal behavior of the sample with cooling
enabled excellent agreement between experiment and theory to be achieved,
emphasizing the quality of the applied model, and the observed spectral
peaks could be assigned to specific atomic motions in the solid. Form
I and Form II polymorphs of ribavirin were both investigated with
ss-DFT to understand the different aspects governing the relative
stabilities of these solids. The ss-DFT simulations of the polymorph
energies revealed that Form II is more stable at all temperatures
due to a stronger cohesive energy than Form I; however, ribavirin
in Form I has a significantly lower conformational energy. The finding
of monotropism appears to conflict with the reported enantiotropism
of the ribavirin polymorphs but ultimately confirms that crystal defects
in the real samples greatly affect the thermodynamic relationship
of the crystals.
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Affiliation(s)
- Margaret P Davis
- Department of Chemistry, Syracuse University, 1-133 Center for Science and Technology, Syracuse, New York 13244-4100, United States
| | - Timothy M Korter
- Department of Chemistry, Syracuse University, 1-133 Center for Science and Technology, Syracuse, New York 13244-4100, United States
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7
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Li Q, Kölbel J, Davis MP, Korter TM, Bond AD, Threlfall T, Zeitler JA. In Situ Observation of the Structure of Crystallizing Magnesium Sulfate Heptahydrate Solutions with Terahertz Transmission Spectroscopy. CRYSTAL GROWTH & DESIGN 2022; 22:3961-3972. [PMID: 35673396 PMCID: PMC9165030 DOI: 10.1021/acs.cgd.2c00352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/05/2022] [Indexed: 06/15/2023]
Abstract
Terahertz time-domain spectroscopy in a transmission geometry combined with visual analysis was used to investigate the crystallization process of MgSO4 solution. Careful spectral analysis of both a feature at 1.6 THz and the overall magnitude of absorption allowed the extraction of information about the liquid phase before and during crystallization, aiding the investigation of solvation dynamics and the behavior of molecular species at phase boundaries. The method was reproducibly applied to a number of measurements on a series of solutions of three chosen concentrations at different temperatures. When increasing temperature at the end of the measurement, the dissolution of crystals was observed as well. The temperature-dependent absorption data of the semicrystalline systems were converted to the solvent concentrations using a recently developed method. Solutions of a series of concentrations were also investigated in the temperature range of 4-25 °C. The results were compared to the theoretical calculated values, and the consistent differences proved the existence of a hydration shell around the salt ions whose behavior is different from bulk water. Future work will focus on triggering nucleation at specific positions in order to study the very beginning of the crystallization process. MgSO4 heptahydrate is used as a model system in this study, while the concept and the setup can be applied to other systems.
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Affiliation(s)
- Qi Li
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
| | - Johanna Kölbel
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
| | - Margaret P. Davis
- Department
of Chemistry, Syracuse University, 1-046 Center for Science and Technology, Syracuse, New York 13244, United States
| | - Timothy M. Korter
- Department
of Chemistry, Syracuse University, 1-046 Center for Science and Technology, Syracuse, New York 13244, United States
| | - Andrew D. Bond
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield
Road, Cambridge CB2 1EW, U.K.
| | - Terrence Threlfall
- Department
of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, U.K.
| | - J. Axel Zeitler
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
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8
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Möslein A, Donà L, Civalleri B, Tan JC. Defect Engineering in Metal-Organic Framework Nanocrystals: Implications for Mechanical Properties and Performance. ACS APPLIED NANO MATERIALS 2022; 5:6398-6409. [PMID: 35655928 PMCID: PMC9150067 DOI: 10.1021/acsanm.2c00493] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 02/27/2022] [Indexed: 05/21/2023]
Abstract
The growth process of metal-organic framework (MOF) nanocrystals defines their properties and functions. However, defects may be prevalent during the crystallization of even seemingly perfect MOFs, such as zeolitic imidazolate framework-8 (ZIF-8), and yet direct probing of such structural defects has been challenging because of the lack of nanoscale techniques to locally examine individual nanocrystals. Here, we directly study local defects, such as missing linkers or metal vacancies, in ZIF-8 nano- and microcrystals with near-field IR nanospectroscopy combined with density functional theory calculations. We track the chemical changes during crystallization and show that structural defects like zinc cations that are bound to molecules of the reactant gradually disappear with ripening of the crystals, while dangling and missing linker defects prevail. The resulting defect-terminating groups or open-metal sites produce mechanical anisotropy and reduce the Young's modulus, as measured via tip force microscopy with nanoscale resolution and supported by theoretical modeling. However, these structural defects also open the door for defect engineering to tune the performance of ZIF-8 by offering additional adsorption sites for targeted catalytic reactions, chemical sensing, or gas capture.
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Affiliation(s)
- Annika
F. Möslein
- Multifunctional
Materials and Composites Laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Lorenzo Donà
- Dipartimento
di Chimica, Università di Torino, Via P. Giuria 5, Torino 10125, Italy
| | - Bartolomeo Civalleri
- Dipartimento
di Chimica, Università di Torino, Via P. Giuria 5, Torino 10125, Italy
| | - Jin-Chong Tan
- Multifunctional
Materials and Composites Laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
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9
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Mohara M, Davis MP, Korter TM, Shimura K, Ono T, Aiko K. Study on Hydration and Dehydration of Ezetimibe by Terahertz Spectroscopy with Humidity-Controlled Measurements and Theoretical Analysis. J Phys Chem A 2022; 126:2879-2888. [PMID: 35522730 PMCID: PMC9125560 DOI: 10.1021/acs.jpca.2c00301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Understanding the
solid-state transitions of active pharmaceutical
ingredients (APIs) is essential for quality control since differences
in their forms affect the bioavailability of APIs. Terahertz (THz)
frequency-domain spectroscopy is suitable for such an application
since it can sensitively probe the lattice phonon modes originating
in the crystal structures. THz absorption spectra were obtained for
ezetimibe (EZT) and ezetimibe monohydrate (EZT-MH), which have similar
crystalline structures and belong to the same space group. The observed
absorption spectrum of EZT matched well with the solid-state density
functional theory (ss-DFT)-simulated spectrum for the structures at
0 K and room temperature (modeled using constrained unit cell volumes).
However for EZT-MH, the ss-DFT spectrum of the room-temperature structure
showed better correlation with the experimental THz spectrum than
that of the simulated spectrum of the 0 K structures, suggesting that
the EZT-MH crystal has greater anharmonic character. Gibbs free-energy
curves were calculated, and EZT-MH was found to be more stable than
pure EZT and water in a broad temperature range. The hydrate stability
may be influenced by the existence of more hydrogen bonds in EZT-MH.
The hydration and dehydration of EZT in a pure API tablet and formulation
tablets were monitored using a THz spectrometer with a humidity-controlled
sample chamber. The effect of the excipient in the formulation tablet
on hydration was successfully confirmed by showing that the solid-state
transition of the API with excipients is significantly slower than
that without it. Under a relative humidity of 60%, hydration of EZT
in a pure EZT tablet occurred in 200 min, while the hydration of EZT
in a formulation tablet was 50 times slower.
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Affiliation(s)
- Mizuki Mohara
- Hitachi High-Tech Corp., Shinko-cho, Hitachinaka 312-8504, Japan
| | - Margaret P Davis
- Department of Chemistry, Syracuse University, Syracuse, New York 13244, United States
| | - Timothy M Korter
- Department of Chemistry, Syracuse University, Syracuse, New York 13244, United States
| | - Kei Shimura
- Hitachi High-Tech Corp., Shinko-cho, Hitachinaka 312-8504, Japan
| | - Touya Ono
- Hitachi High-Tech Corp., Shinko-cho, Hitachinaka 312-8504, Japan
| | - Kenji Aiko
- Hitachi High-Tech Corp., Shinko-cho, Hitachinaka 312-8504, Japan
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10
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Donà L, Brandenburg JG, Civalleri B. Metal-Organic Frameworks Properties from Hybrid Density Functional Approximations. J Chem Phys 2022; 156:094706. [DOI: 10.1063/5.0080359] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Lorenzo Donà
- Università degli Studi di Torino, Department of Chemistry, Italy
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11
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Li Q, Bond AD, Korter TM, Zeitler JA. New Insights into the Crystallographic Disorder in the Polymorphic Forms of Aspirin from Low-Frequency Vibrational Analysis. Mol Pharm 2022; 19:227-234. [PMID: 34854685 DOI: 10.1021/acs.molpharmaceut.1c00727] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Terahertz time-domain spectroscopy (THz-TDS) is applied to two polymorphs of acetylsalicylic acid (aspirin), and the experimental spectra are compared to lattice dynamical calculations using high accuracy density functional theory. The calculations confirm that forms I and II have very close energetic and thermodynamic properties and also that they show similar spectral features in the far-infrared region, reflecting the high degree of similarity in their crystal structures. Unique vibrational modes are identified for each polymorph which allow them to be distinguished using THz-TDS measurements. The observation of spectral features attributable to both polymorphic forms in a single sample, however, provides further evidence to support the hypothesis that crystalline aspirin typically comprises intergrown domains of forms I and II. Differences observed in the baseline of the measured THz-TDS spectra indicate a greater degree of structural disorder in the samples of form II. Calculated Gibbs free-energy curves show a turning point at 75 K, inferring that form II is expected to be more stable than form I above this temperature as a result of its greater vibrational entropy. The calculations do not account for any differences in configurational entropy that may arise from expected structural defects. Further computational work on these structures, such as ab initio molecular dynamics, would be very useful to further explore this perspective. Here, aspirin is a model system to show how the additional insight from the low-frequency vibrational information complements the structural data and allows for quantitative thermodynamic information of pharmaceutical polymorphs to be extracted. The methodology is directly applicable to other polymorphic systems.
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Affiliation(s)
- Qi Li
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K
| | - Andrew D Bond
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Timothy M Korter
- Department of Chemistry, Syracuse University, 1-014 Center for Science and Technology, Syracuse, New York 13244, United States
| | - J Axel Zeitler
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K
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