1
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Butler PV, Hafizi R, Day GM. Machine-Learned Potentials by Active Learning from Organic Crystal Structure Prediction Landscapes. J Phys Chem A 2024; 128:945-957. [PMID: 38277275 PMCID: PMC10860135 DOI: 10.1021/acs.jpca.3c07129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 01/04/2024] [Accepted: 01/11/2024] [Indexed: 01/28/2024]
Abstract
A primary challenge in organic molecular crystal structure prediction (CSP) is accurately ranking the energies of potential structures. While high-level solid-state density functional theory (DFT) methods allow for mostly reliable discrimination of the low-energy structures, their high computational cost is problematic because of the need to evaluate tens to hundreds of thousands of trial crystal structures to fully explore typical crystal energy landscapes. Consequently, lower-cost but less accurate empirical force fields are often used, sometimes as the first stage of a hierarchical scheme involving multiple stages of increasingly accurate energy calculations. Machine-learned interatomic potentials (MLIPs), trained to reproduce the results of ab initio methods with computational costs close to those of force fields, can improve the efficiency of the CSP by reducing or eliminating the need for costly DFT calculations. Here, we investigate active learning methods for training MLIPs with CSP datasets. The combination of active learning with the well-developed sampling methods from CSP yields potentials in a highly automated workflow that are relevant over a wide range of the crystal packing space. To demonstrate these potentials, we illustrate efficiently reranking large, diverse crystal structure landscapes to near-DFT accuracy from force field-based CSP, improving the reliability of the final energy ranking. Furthermore, we demonstrate how these potentials can be extended to more accurately model structures far from lattice energy minima through additional on-the-fly training within Monte Carlo simulations.
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Affiliation(s)
| | - Roohollah Hafizi
- School of Chemistry, University
of Southampton, Southampton SO17 1BJ, U.K.
| | - Graeme M. Day
- School of Chemistry, University
of Southampton, Southampton SO17 1BJ, U.K.
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2
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Brown M, Skelton JM, Popelier PLA. Construction of a Gaussian Process Regression Model of Formamide for Use in Molecular Simulations. J Phys Chem A 2023; 127:1702-1714. [PMID: 36756842 PMCID: PMC9969515 DOI: 10.1021/acs.jpca.2c06566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
FFLUX, a novel force field based on quantum chemical topology, can perform molecular dynamics simulations with flexible multipole moments that change with geometry. This is enabled by Gaussian process regression machine learning models, which accurately predict atomic energies and multipole moments up to the hexadecapole. We have constructed a model of the formamide monomer at the B3LYP/aug-cc-pVTZ level of theory capable of sub-kJ mol-1 accuracy, with the maximum prediction error for the molecule being 0.8 kJ mol-1. This model was used in FFLUX simulations along with Lennard-Jones parameters to successfully optimize the geometry of formamide dimers with errors smaller than 0.1 Å compared to those obtained with D3-corrected B3LYP/aug-cc-pVTZ. Comparisons were also made to a force field constructed with static multipole moments and Lennard-Jones parameters. FFLUX recovers the expected energy ranking of dimers compared to the literature, and changes in C═O and C-N bond lengths associated with hydrogen bonding were found to be consistent with density functional theory.
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3
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Zhang L, Zhou J, Wu Y, Wang P, Jin S, Lu Y, Wang D. Noncovalent-bonded 2D-3D supramolecular adducts from 6-methylpyridine-3-carboxamide and carboxylic acids. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Zhou J, Jin S, He L, Xu Y, Gao X, Liu B, Chen Z, Wang D. Twelve Salts Fabricated from 2-amino-5-methylthiazole and Carboxylic Acids through Combination of Classical H-bonds and Weak Noncovalent Associations. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Ten Salts and One Co-crystal Fabricated from 4-methylbenzo[d]thiazol-2-amine and Acids through Combination of Classical H-bonds and Weak Noncovalent Interactions. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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6
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Sugden IJ, Braun DE, Bowskill DH, Adjiman CS, Pantelides CC. Efficient Screening of Coformers for Active Pharmaceutical Ingredient Cocrystallization. CRYSTAL GROWTH & DESIGN 2022; 22:4513-4527. [PMID: 35915670 PMCID: PMC9337750 DOI: 10.1021/acs.cgd.2c00433] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Controlling the physical properties of solid forms for active pharmaceutical ingredients (APIs) through cocrystallization is an important part of drug product development. However, it is difficult to know a priori which coformers will form cocrystals with a given API, and the current state-of-the-art for cocrystal discovery involves an expensive, time-consuming, and, at the early stages of pharmaceutical development, API material-limited experimental screen. We propose a systematic, high-throughput computational approach primarily aimed at identifying API/coformer pairs that are unlikely to lead to experimentally observable cocrystals and can therefore be eliminated with only a brief experimental check, from any experimental investigation. On the basis of a well-established crystal structure prediction (CSP) methodology, the proposed approach derives its efficiency by not requiring any expensive quantum mechanical calculations beyond those already performed for the CSP investigation of the neat API itself. The approach and assumptions are tested through a computational investigation on 30 potential 1:1 multicomponent systems (cocrystals and solvate) involving 3 active pharmaceutical ingredients and 9 coformers and one solvent. This is complemented with a detailed experimental investigation of all 30 pairs, which led to the discovery of five new cocrystals (three API-coformer combinations, a polymorphic cocrystal example, and one with different stoichiometries) and a cis-aconitic acid polymorph. The computational approach indicates that, for some APIs, a significant proportion of all potential API/coformer pairs could be investigated with only a brief experimental check, thereby saving considerable experimental effort.
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Affiliation(s)
- Isaac J. Sugden
- Molecular
Systems Engineering Group, Department of Chemical Engineering, Sargent
Centre for Process Systems Engineering, Institute for Molecular Science
and Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Doris E. Braun
- University
of Innsbruck, Institute of Pharmacy,
Pharmaceutical Technology, Josef-Moeller-Haus, Innrain 52c, A-6020 Innsbruck, Austria
| | - David H. Bowskill
- Molecular
Systems Engineering Group, Department of Chemical Engineering, Sargent
Centre for Process Systems Engineering, Institute for Molecular Science
and Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Claire S. Adjiman
- Molecular
Systems Engineering Group, Department of Chemical Engineering, Sargent
Centre for Process Systems Engineering, Institute for Molecular Science
and Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Constantinos C. Pantelides
- Molecular
Systems Engineering Group, Department of Chemical Engineering, Sargent
Centre for Process Systems Engineering, Institute for Molecular Science
and Engineering, Imperial College London, London SW7 2AZ, United Kingdom
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7
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Preparation and characterization of five 3D crystalline adducts from caffeine and organic acids. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132697] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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8
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Wen X, Lu Y, Jin S, Zhu Y, Liu B, Wang D, Chen B, Wang P. Crystal structures of six salts from nicotinamide and organic acids by classical H-bonds and other noncovalent forces. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132332] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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10
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Yang X, Zhu Y, Chen X, Gao X, Jin S, Liu B, He L, Chen B, Wang D. Molecular structures of ten ionic hydrogen bond-mediated anhydrous tert-butylammonium salts from different carboxylic acids. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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11
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Beran GJO, Sugden IJ, Greenwell C, Bowskill DH, Pantelides CC, Adjiman CS. How many more polymorphs of ROY remain undiscovered. Chem Sci 2022; 13:1288-1297. [PMID: 35222912 PMCID: PMC8809489 DOI: 10.1039/d1sc06074k] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/10/2021] [Indexed: 12/15/2022] Open
Abstract
With 12 crystal forms, 5-methyl-2-[(2-nitrophenyl)amino]-3-thiophenecabonitrile (a.k.a. ROY) holds the current record for the largest number of fully characterized organic crystal polymorphs. Four of these polymorph structures have been reported since 2019, raising the question of how many more ROY polymorphs await future discovery. Employing crystal structure prediction and accurate energy rankings derived from conformational energy-corrected density functional theory, this study presents the first crystal energy landscape for ROY that agrees well with experiment. The lattice energies suggest that the seven most stable ROY polymorphs (and nine of the twelve lowest-energy forms) on the Z′ = 1 landscape have already been discovered experimentally. Discovering any new polymorphs at ambient pressure will likely require specialized crystallization techniques capable of trapping metastable forms. At pressures above 10 GPa, however, a new crystal form is predicted to become enthalpically more stable than all known polymorphs, suggesting that further high-pressure experiments on ROY may be warranted. This work highlights the value of high-accuracy crystal structure prediction for solid-form screening and demonstrates how pragmatic conformational energy corrections can overcome the limitations of conventional density functionals for conformational polymorphs. Crystal structure prediction suggests that the low-energy polymorphs of ROY have already been found, but a new high-pressure form is predicted.![]()
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Affiliation(s)
- Gregory J. O. Beran
- Department of Chemistry, University of California Riverside, Riverside, CA 92521, USA
| | - Isaac J. Sugden
- Department of Chemical Engineering, Sargent Centre for Process Systems Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Chandler Greenwell
- Department of Chemistry, University of California Riverside, Riverside, CA 92521, USA
| | - David H. Bowskill
- Department of Chemical Engineering, Sargent Centre for Process Systems Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Constantinos C. Pantelides
- Department of Chemical Engineering, Sargent Centre for Process Systems Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Claire S. Adjiman
- Department of Chemical Engineering, Sargent Centre for Process Systems Engineering, Imperial College London, London, SW7 2AZ, UK
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12
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Wu R, Chen Z, Gao X, Chen X, Jin S, He L, Chen B, Wang D. Preparation and characterization of eight crystalline supramolecular salts from 4-dimethylaminopyridine and aromatic acids. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131088] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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13
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Zhang Y, Zhang Y, Ye W, Li Z, Jin S, Guo M, Bai L, Wang D. Eleven adducts constructed from 4-methylbenzo[d]thiazol-2-amine and organic acids via coupling of classical H-bonds and noncovalent interactions. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Chen B, Lin Z, Wu R, Jin S, Dong L, Bai L, Xu W, Wang D. Nine Supramolecular Adducts of 4-dimethylaminopyridine and Carboxylic acids Assembled by Classical Hydrogen Bonds and Other Noncovalent Intermolecular Interactions. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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15
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Structures of eleven organic acid-base adducts from 2-aminobenzothiazole/2-aminothiazole and acidic compounds. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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16
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Pawlak T, Sudgen I, Bujacz G, Iuga D, Brown SP, Potrzebowski MJ. Synergy of Solid-State NMR, Single-Crystal X-ray Diffraction, and Crystal Structure Prediction Methods: A Case Study of Teriflunomide (TFM). CRYSTAL GROWTH & DESIGN 2021; 21:3328-3343. [PMID: 34267599 PMCID: PMC8273857 DOI: 10.1021/acs.cgd.1c00123] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 04/27/2021] [Indexed: 06/13/2023]
Abstract
In this work, for the first time, we present the X-ray diffraction crystal structure and spectral properties of a new, room-temperature polymorph of teriflunomide (TFM), CSD code 1969989. As revealed by DSC, the low-temperature TFM polymorph recently reported by Gunnam et al. undergoes a reversible thermal transition at -40 °C. This reversible process is related to a change in Z' value, from 2 to 1, as observed by variable-temperature 1H-13C cross-polarization (CP) magic-angle spinning (MAS) solid-state NMR, while the crystallographic system is preserved (triclinic). Two-dimensional 13C-1H and 1H-1H double-quantum MAS NMR spectra are consistent with the new room-temperature structure, including comparison with GIPAW (gauge-including projector augmented waves) calculated NMR chemical shifts. A crystal structure prediction procedure found both experimental teriflunomide polymorphs in the energetic global minimum region. Differences between the polymorphs are seen for the torsional angle describing the orientation of the phenyl ring relative to the planarity of the TFM molecule. In the low-temperature structure, there are two torsion angles of 4.5 and 31.9° for the two Z' = 2 molecules, while in the room-temperature structure, there is disorder that is modeled with ∼50% occupancy between torsion angles of -7.8 and 28.6°. These observations are consistent with a broad energy minimum as revealed by DFT calculations. PISEMA solid-state NMR experiments show a reduction in the C-H dipolar coupling in comparison to the static limit for the aromatic CH moieties of 75% and 51% at 20 and 40 °C, respectively, that is indicative of ring flips at the higher temperature. Our study shows the power of combining experiments, namely DSC, X-ray diffraction, and MAS NMR, with DFT calculations and CSP to probe and understand the solid-state landscape, and in particular the role of dynamics, for pharmaceutical molecules.
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Affiliation(s)
- Tomasz Pawlak
- Centre
of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Isaac Sudgen
- Molecular
Systems Engineering Group, Centre for Process Systems Engineering,
Department of Chemical Engineering, Imperial
College London, London SW7 2AZ, U.K.
| | - Grzegorz Bujacz
- Institute
of Molecular and Industrial Biotechnology, Lodz University of Technology, Stefanowskiego 4/10, 90-924, Lodz, Poland
| | - Dinu Iuga
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
| | - Steven P. Brown
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
| | - Marek J. Potrzebowski
- Centre
of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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17
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Crystal structure of five solid forms from isonicotinamide and carboxylic acids assembled by classical hydrogen bonds and other noncovalent interactions. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Eleven adducts from 4-methylbenzo[d]thiazol-2-amineand Carboxylic Acids via Classical H-bonds and Noncovalent Associations. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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19
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Wu R, Yu Y, Guo M, Jin S, Wang D. Eight salts of 4-dimethylaminopyridine and organic acids by H-bonds and some noncovalent associations. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129850] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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20
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Hosten EC, Betz R. The crystal structure of α-( meta-methoxyphenoxy)- ortho-tolylic acid, C 15H 14O 4. Z KRIST-NEW CRYST ST 2021. [DOI: 10.1515/ncrs-2020-0576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C15H14O4, monoclinic, C2/c (no. 15), a = 27.1122(8) Å, b = 6.4295(2) Å, c = 14.7495(4) Å, β = 91.7070(10)°, V = 2569.96(13) Å3, Z = 8, Rgt
(F) = 0.0387, wRref
(F
2) = 0.1091, T = 200 K.
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Affiliation(s)
- Eric C. Hosten
- Department of Chemistry , Nelson Mandela University, Summerstrand Campus (South), University Way, Summerstrand , P.O. Box 77000, Port Elizabeth 6031, South Africa
| | - Richard Betz
- Department of Chemistry , Nelson Mandela University, Summerstrand Campus (South), University Way, Summerstrand , P.O. Box 77000, Port Elizabeth 6031, South Africa
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21
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Bowskill DH, Sugden IJ, Konstantinopoulos S, Adjiman CS, Pantelides CC. Crystal Structure Prediction Methods for Organic Molecules: State of the Art. Annu Rev Chem Biomol Eng 2021; 12:593-623. [PMID: 33770462 DOI: 10.1146/annurev-chembioeng-060718-030256] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The prediction of the crystal structures that a given organic molecule is likely to form is an important theoretical problem of significant interest for the pharmaceutical and agrochemical industries, among others. As evidenced by a series of six blind tests organized over the past 2 decades, methodologies for crystal structure prediction (CSP) have witnessed substantial progress and have now reached a stage of development where they can begin to be applied to systems of practical significance. This article reviews the state of the art in general-purpose methodologies for CSP, placing them within a common framework that highlights both their similarities and their differences. The review discusses specific areas that constitute the main focus of current research efforts toward improving the reliability and widening applicability of these methodologies, and offers some perspectives for the evolution of this technology over the next decade.
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Affiliation(s)
- David H Bowskill
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, and Institute for Molecular Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;
| | - Isaac J Sugden
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, and Institute for Molecular Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;
| | - Stefanos Konstantinopoulos
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, and Institute for Molecular Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;
| | - Claire S Adjiman
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, and Institute for Molecular Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;
| | - Constantinos C Pantelides
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, and Institute for Molecular Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;
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22
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Kamat K, Guo R, Reutzel-Edens SM, Price SL, Peters B. Diabat method for polymorph free energies: Extension to molecular crystals. J Chem Phys 2020; 153:244105. [PMID: 33380078 DOI: 10.1063/5.0024727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Lattice-switch Monte Carlo and the related diabat methods have emerged as efficient and accurate ways to compute free energy differences between polymorphs. In this work, we introduce a one-to-one mapping from the reference positions and displacements in one molecular crystal to the positions and displacements in another. Two features of the mapping facilitate lattice-switch Monte Carlo and related diabat methods for computing polymorph free energy differences. First, the mapping is unitary so that its Jacobian does not complicate the free energy calculations. Second, the mapping is easily implemented for molecular crystals of arbitrary complexity. We demonstrate the mapping by computing free energy differences between polymorphs of benzene and carbamazepine. Free energy calculations for thermodynamic cycles, each involving three independently computed polymorph free energy differences, all return to the starting free energy with a high degree of precision. The calculations thus provide a force field independent validation of the method and allow us to estimate the precision of the individual free energy differences.
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Affiliation(s)
- Kartik Kamat
- Department of Chemical Engineering, University of California-Santa Barbara, Santa Barbara, California 93106, USA
| | - Rui Guo
- Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom
| | - Susan M Reutzel-Edens
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, USA
| | - Sarah L Price
- Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom
| | - Baron Peters
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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23
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Xu W, Hu K, Lu Y, Ye H, Jin S, Li M, Guo M, Wang D. The crystal structures of ten supramolecular salts of benzylamine and organic acids. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128554] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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24
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Shunnar AF, Dhokale B, Karothu DP, Bowskill DH, Sugden IJ, Hernandez HH, Naumov P, Mohamed S. Efficient Screening for Ternary Molecular Ionic Cocrystals Using a Complementary Mechanosynthesis and Computational Structure Prediction Approach. Chemistry 2020; 26:4752-4765. [PMID: 31793669 PMCID: PMC7187361 DOI: 10.1002/chem.201904672] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Indexed: 12/16/2022]
Abstract
The discovery of molecular ionic cocrystals (ICCs) of active pharmaceutical ingredients (APIs) widens the opportunities for optimizing the physicochemical properties of APIs whilst facilitating the delivery of multiple therapeutic agents. However, ICCs are often observed serendipitously in crystallization screens and the factors dictating their crystallization are poorly understood. We demonstrate here that mechanochemical ball milling is a versatile technique for the reproducible synthesis of ternary molecular ICCs in less than 30 min of grinding with or without solvent. Computational crystal structure prediction (CSP) calculations have been performed on ternary molecular ICCs for the first time and the observed crystal structures of all the ICCs were correctly predicted. Periodic dispersion-corrected DFT calculations revealed that all the ICCs are thermodynamically stable (mean stabilization energy=-2 kJ mol-1 ) relative to the crystallization of a physical mixture of the binary salt and acid. The results suggest that a combined mechanosynthesis and CSP approach could be used to target the synthesis of higher-order molecular ICCs with functional properties.
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Affiliation(s)
- Abeer F. Shunnar
- Department of ChemistryKhalifa University of Science and TechnologyP.O. Box 127788Abu DhabiUAE
| | - Bhausaheb Dhokale
- Department of ChemistryKhalifa University of Science and TechnologyP.O. Box 127788Abu DhabiUAE
| | | | - David H. Bowskill
- Molecular Systems Engineering GroupCentre for Process Systems EngineeringDepartment of Chemical EngineeringImperial College LondonLondonSW7 2AZUK
| | - Isaac J. Sugden
- Molecular Systems Engineering GroupCentre for Process Systems EngineeringDepartment of Chemical EngineeringImperial College LondonLondonSW7 2AZUK
| | - Hector H. Hernandez
- Department of Biomedical EngineeringCenter for Membrane and Advanced Water TechnologyKhalifa University of Science and TechnologyMasdar Campus P.O. Box 127788Abu DhabiUAE
| | - Panče Naumov
- New York University Abu DhabiP.O. Box 129188Abu DhabiUAE
| | - Sharmarke Mohamed
- Department of ChemistryKhalifa University of Science and TechnologyP.O. Box 127788Abu DhabiUAE
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25
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Mo L, Jin S, Zhang W, Guo J, Liu H, Wang D. The crystal structures of ten supramolecular adducts of benzylamine and organic acids. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Fang W, Chen B, Chen D, Wang S, Yan Y, Jin S, Xu W, Wang D. Seven supramolecular adducts of 4-dimethylaminopyridine and carboxylic acids constructed by classical H-Bonds and some noncovalent interactions. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127353] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Chen J, Li J, Fu X, Xie Q, Zeng T, Jin S, Xu W, Wang D. Structures of ten organic salts from 2-aminothiazole/2-aminobenzothiazole and acidic compounds. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Fang W, Ye X, Zhang Y, Zhang Y, Jin S, Xu W, Wang D. Nine supramolecular adducts of 4-dimethylaminopyridine and organic acids constructed by classical H-Bonds and some noncovalent interactions. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Cruz-Cabeza AJ, Taylor E, Sugden IJ, Bowskill DH, Wright SE, Abdullahi H, Tulegenov D, Sadiq G, Davey RJ. Can solvated intermediates inform us about nucleation pathways? The case of β-pABA. CrystEngComm 2020. [DOI: 10.1039/d0ce00970a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using crystallography to search for nucleation pathways: α and β polymorphs of p-aminobenzoic acid.
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Affiliation(s)
- A. J. Cruz-Cabeza
- Department of Chemical Engineering and Analytical Sciences
- University of Manchester
- UK
| | - E. Taylor
- Department of Chemical Engineering and Analytical Sciences
- University of Manchester
- UK
| | - I. J. Sugden
- Molecular Systems Engineering Group
- Centre for Process Systems Engineering
- Department of Chemical Engineering
- Imperial College London
- London SW7 2AZ
| | - D. H. Bowskill
- Molecular Systems Engineering Group
- Centre for Process Systems Engineering
- Department of Chemical Engineering
- Imperial College London
- London SW7 2AZ
| | - S. E. Wright
- Department of Chemical Engineering and Analytical Sciences
- University of Manchester
- UK
| | - H. Abdullahi
- Department of Chemical Engineering and Analytical Sciences
- University of Manchester
- UK
| | - D. Tulegenov
- Department of Chemical Engineering and Analytical Sciences
- University of Manchester
- UK
| | - G. Sadiq
- Cambridge Crystallographic Data Centre
- Cambridge CB2 1EZ
- UK
| | - R. J. Davey
- Department of Chemical Engineering and Analytical Sciences
- University of Manchester
- UK
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30
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Xu W, Lu Y, Xia Y, Liu B, Jin S, Zhong B, Wang D, Guo M. Seven 3D organic salts from 2-(imidazol-1-yl)-1-phenylethanone and acidic components. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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31
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Sugden IJ, Adjiman CS, Pantelides CC. Accurate and efficient representation of intramolecular energy in ab initio generation of crystal structures. II. Smoothed intramolecular potentials. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2019; 75:423-433. [PMID: 32830664 DOI: 10.1107/s2052520619005778] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 04/27/2019] [Indexed: 06/11/2023]
Abstract
The application of crystal structure prediction (CSP) to industrially relevant molecules requires the handling of increasingly large and flexible compounds. A revised model for the effect of molecular flexibility on the lattice energy that removes the discontinuities and non-differentiabilities present in earlier models (Sugden et al., 2016), with a view to improving the performance of CSP is presented. The approach is based on the concept of computing a weighted average of local models, and has been implemented within the CrystalPredictor code. Through the comparative investigation of several compounds studied in earlier literature, it is shown that this new model results in large reductions in computational effort (of up to 65%) and in significant increases in reliability. The approach is further applied to investigate, for the first time, the computational polymorphic landscape of flufenamic acid for Z' = 1 structures, resulting in the successful identification of all three experimentally resolved polymorphs within reasonable computational time.
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Affiliation(s)
- Isaac J Sugden
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Claire S Adjiman
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Constantinos C Pantelides
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
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32
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Sun L, Hu K, Jin S, Lu Y, Xu C, Liu B, Wang D, Xia G. Single-crystal and molecular structures of five hydrogen-bonding supramolecular salts based on 4-aminobenzoic acid, 2-aminobenzoic acid and acidic components. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.10.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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33
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Single-crystal and molecular structures of six hydrogen-bonding 3D supramolecular salts from 2-aminobenzoic acid, 3-aminobenzoic acid, 4-aminobenzoic acid, and acidic components. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.10.080] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Gatsiou CA, Adjiman CS, Pantelides CC. Repulsion-dispersion parameters for the modelling of organic molecular crystals containing N, O, S and Cl. Faraday Discuss 2018; 211:297-323. [PMID: 30094433 DOI: 10.1039/c8fd00064f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In lattice energy models that combine ab initio and empirical components, it is important to ensure consistency between these components so that meaningful quantitative results are obtained. A method for deriving parameters of atom-atom repulsion dispersion potentials for crystals, tailored to different ab initio models, is presented. It is based on minimization of the sum of squared deviations between experimental and calculated structures and energies. The solution algorithm is designed to avoid convergence to local minima in the parameter space by combining a deterministic low-discrepancy sequence for the generation of multiple initial parameter guesses with an efficient local minimization algorithm. The proposed approach is applied to derive transferable exp-6 potential parameters suitable for use in conjunction with a distributed multipole electrostatics model derived from isolated molecule charge densities calculated at the M06/6-31G(d,p) level of theory. Data for hydrocarbons, azahydrocarbons, oxohydrocarbons, organosulphur compounds and chlorohydrocarbons are used for the estimation. A good fit is achieved for the new set of parameters with a mean absolute error in sublimation enthalpies of 4.1 kJ mol-1 and an average rmsd15 of 0.31 Å. The parameters are found to perform well on a separate cross-validation set of 39 compounds.
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Affiliation(s)
- Christina A Gatsiou
- Molecular Systems Engineering Group, Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
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35
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Ahokas J, Kosendiak I, Krupa J, Lundell J, Wierzejewska M. FTIR matrix isolation and theoretical studies of glycolic acid dimers. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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36
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Hashim MI, Le HTM, Chen TH, Chen YS, Daugulis O, Hsu CW, Jacobson AJ, Kaveevivitchai W, Liang X, Makarenko T, Miljanić OŠ, Popovs I, Tran HV, Wang X, Wu CH, Wu JI. Dissecting Porosity in Molecular Crystals: Influence of Geometry, Hydrogen Bonding, and [π···π] Stacking on the Solid-State Packing of Fluorinated Aromatics. J Am Chem Soc 2018; 140:6014-6026. [PMID: 29656637 DOI: 10.1021/jacs.8b02869] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Porous molecular crystals are an emerging class of porous materials that is unique in being built from discrete molecules rather than being polymeric in nature. In this study, we examined the effects of molecular structure of the precursors on the formation of porous solid-state structures with a series of 16 rigid aromatics. The majority of these precursors possess pyrazole groups capable of hydrogen bonding, as well as electron-rich aromatics and electron-poor tetrafluorobenzene rings. These precursors were prepared using a combination of Pd- and Cu-catalyzed cross-couplings, careful manipulations of protecting groups on the nitrogen atoms, and solvothermal syntheses. Our study varied the geometry and dimensions of precursors, as well as the presence of groups capable of hydrogen bonding and [π···π] stacking. Thirteen derivatives were crystallographically characterized, and four of them were found to be porous with surface areas between 283 and 1821 m2 g-1. Common to these four porous structures were (a) rigid trigonal geometry, (b) [π···π] stacking of electron-poor tetrafluorobenzenes with electron-rich pyrazoles or tetrazoles, and
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Affiliation(s)
- Mohamed I Hashim
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Ha T M Le
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Teng-Hao Chen
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Yu-Sheng Chen
- Center for Advanced Radiation Source (ChemMatCARS) , The University of Chicago , c/o APS/ANL, 9700 South Cass Drive , Argonne , Illinois 60439 , United States
| | - Olafs Daugulis
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Chia-Wei Hsu
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Allan J Jacobson
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States.,Texas Center for Superconductivity , 202 UH Science Center , Houston , Texas 77204-5002 , United States
| | - Watchareeya Kaveevivitchai
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Xiao Liang
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Tatyana Makarenko
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Ognjen Š Miljanić
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Ilja Popovs
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Hung Vu Tran
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Xiqu Wang
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Chia-Hua Wu
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
| | - Judy I Wu
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard #112 , Houston , Texas 77204-5003 , United States
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37
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Syntheses and structure characterization of ten acid-base hybrid crystals based on imidazole derivatives and mineral acids. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.12.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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38
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39
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Dong L, Jin S, Jin S, Gao X, Xie X, Lin Z, Wang Y, Xu W, Wang D. Supramolecular salts of 5,7-dimethyl-1,8-naphthyridine-2-amine and acids through classical H-Bonds and other intermolecular interactions. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.09.102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Ding A, Jin S, Jin S, Hu K, Lin Z, Liu H, Wang D. Crystal structures of eight 3D molecular adducts derived from bis-imidazole, bis(benzimidazole), and organic acids. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.09.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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41
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Nisar M, Sung HHY, Puschmann H, Lakerveld R, Haynes RK, Williams ID. 11-Azaartemisinin cocrystals with preserved lactam : acid heterosynthons. CrystEngComm 2018. [DOI: 10.1039/c7ce01875d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The R22(8) lactam : acid hetero-synthon, found in several new 1 : 1 and 2 : 1 cocrystals between the anti-malarial 11-azaartemisinin and organic acids.
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Affiliation(s)
- Madiha Nisar
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
| | - Herman H.-Y. Sung
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
| | | | - Richard Lakerveld
- Department of Chemical and Biological Engineering
- Hong Kong University of Science and Technology
- Kowloon
- China
| | - Richard K. Haynes
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
- Centre of Excellence for Pharmaceutical Sciences
| | - Ian D. Williams
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
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42
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Mohamed S, Li L. From serendipity to supramolecular design: assessing the utility of computed crystal form landscapes in inferring the risks of crystal hydration in carboxylic acids. CrystEngComm 2018. [DOI: 10.1039/c8ce00758f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Calculated structural descriptors for predicted anhydrate polymorphs are used to assess the risks of crystal hydration in carboxylic acids.
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Affiliation(s)
- Sharmarke Mohamed
- Department of Chemistry
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | - Liang Li
- Central Technology Platforms
- New York University Abu Dhabi
- Abu Dhabi
- United Arab Emirates
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43
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Mohamed S, Alwan AA, Friščić T, Morris AJ, Arhangelskis M. Towards the systematic crystallisation of molecular ionic cocrystals: insights from computed crystal form landscapes. Faraday Discuss 2018; 211:401-424. [DOI: 10.1039/c8fd00036k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The underlying molecular and crystal properties affecting the crystallisation of organic molecular ionic cocrystals (ICCs) are investigated.
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Affiliation(s)
- Sharmarke Mohamed
- Department of Chemistry
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | - Ahmad A. Alwan
- Department of Chemistry
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | | | - Andrew J. Morris
- School of Metallurgy and Materials
- University of Birmingham
- Birmingham B15 2TT
- UK
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44
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Ding A, Jin S, Jin S, Guo M, Liu H, Guo J, Wang D. Nine supramolecular assemblies from 5,7-dimethyl-1,8-naphthyridine-2-amine and carboxylic acids by strong classical H-bonds and other noncovalent associations. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.09.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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45
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Lin Z, Hu K, Jin S, Ding A, Wang Y, Dong L, Gao X, Wang D. Crystal and molecular structures of sixteen charge-assisted hydrogen bond-mediated diisopropylammonium salts from different carboxylic acids. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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46
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Eleven supramolecular adducts of 5,7-dimethyl-1,8-naphthyridine-2-amine and organic acids assembled by classical hydrogen bonds and other noncovalent intermolecular interactions. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.063] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Lin Z, Jin S, Li X, Xiao X, Hu K, Guo M, Chi X, Liu H, Wang D. Syntheses and structure characterization of ten acid-base hybrid crystals based on N-containing aromatic brønsted bases and mineral acids. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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48
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Chen X, Jin S, Zhang H, Xiao X, Liu B, Wang D. Structure of five molecular salts assembled from noncovalent associations between organic acids, imidazole, benzimidazole, and 1-(2-(1H-benzimidazol-1-yl)ethyl)-1H-benzimidazole. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.05.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Crystal structures of seven molecular salts derived from benzylamine and organic acidic components. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.03.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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50
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Bacchi A, Pelagatti P. Organometallic chemistry meets crystal engineering to give responsive crystalline materials. Chem Commun (Camb) 2016; 52:1327-37. [PMID: 26673552 DOI: 10.1039/c5cc09427e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Dynamically porous crystalline materials have been obtained by engineering organometallic molecules. This feature article deals with organometallic wheel-and-axle compounds, molecules with two relatively bulky groups (wheels) connected by a linear spacer. The wheels are represented by half-sandwich Ru(ii) moieties, while the spacer can be covalent or supramolecular in character. Covalent spacers are obtained using divergent bidentate ligands connecting two [(arene)RuX2] groups. Supramolecular spacers are instead obtained by exploiting the dimerization of COOH or C(O)NH2 groups appended to N-based ligands. A careful choice of ligand functional groups and X ligands leads to the isolation of crystalline materials with remarkable host-guest properties, evidenced by the possibility of reversibly capturing/releasing volatile guests through heterogenous solid-gas reactions. Structural correlations between the crystalline arrangement of the apohost and the host-guest compounds allow us to envisage the structural path followed by the system during the exchange processes.
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Affiliation(s)
- A Bacchi
- Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | - P Pelagatti
- Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
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