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Chen Z, Nie H, Benmore CJ, Smith PA, Du Y, Byrn S, Templeton AC, Su Y. Probing Molecular Packing of Amorphous Pharmaceutical Solids Using X-ray Atomic Pair Distribution Function and Solid-State NMR. Mol Pharm 2023; 20:5763-5777. [PMID: 37800667 DOI: 10.1021/acs.molpharmaceut.3c00628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
The structural investigation of amorphous pharmaceuticals is of paramount importance in comprehending their physicochemical stability. However, it has remained a relatively underexplored realm primarily due to the limited availability of high-resolution analytical tools. In this study, we utilized the combined power of X-ray pair distribution functions (PDFs) and solid-state nuclear magnetic resonance (ssNMR) techniques to probe the molecular packing of amorphous posaconazole and its amorphous solid dispersion at the molecular level. Leveraging synchrotron X-ray PDF data and employing the empirical potential structure refinement (EPSR) methodology, we unraveled the existence of a rigid conformation and discerned short-range intermolecular C-F contacts within amorphous posaconazole. Encouragingly, our ssNMR 19F-13C distance measurements offered corroborative evidence supporting these findings. Furthermore, employing principal component analysis on the X-ray PDF and ssNMR data sets enabled us to gain invaluable insights into the chemical nature of the intermolecular interactions governing the drug-polymer interplay. These outcomes not only furnish crucial structural insights facilitating the comprehension of the underlying mechanisms governing the physicochemical stability but also underscore the efficacy of synergistically harnessing X-ray PDF and ssNMR techniques, complemented by robust modeling strategies, to achieve a high-resolution exploration of amorphous structures.
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Affiliation(s)
- Zhenxuan Chen
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Haichen Nie
- Center for Materials Science and Engineering, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
- Pharmaceutical Sciences and Clinical Supply, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Chris J Benmore
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Pamela A Smith
- Improved Pharma, West Lafayette, Indiana 47906, United States
| | - Yong Du
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Stephen Byrn
- Improved Pharma, West Lafayette, Indiana 47906, United States
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Allen C Templeton
- Pharmaceutical Sciences and Clinical Supply, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Yongchao Su
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
- Pharmaceutical Sciences and Clinical Supply, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
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Zaiter R, Kassem M, Bokova M, Cuisset A, Bychkov E. Mercury Thiogermanate Glasses HgS-GeS 2: Vibrational, Macroscopic, and Electric Properties. J Phys Chem B 2020; 124:7075-7085. [PMID: 32672044 DOI: 10.1021/acs.jpcb.0c03673] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Glasses in the pseudo-binary system (HgS)x (GeS2)1-x were synthesized over the concentration range of 0.0 ≤ x ≤ 0.5. The fundamental glass properties (macroscopic, electric, and vibrational) were studied using differential scanning calorimetry (DSC), direct current (dc) electrical measurements, Raman spectroscopy supported by DFT modeling, and X-ray diffraction. Mercury species in thiogermanate glasses essentially form chain-like (HgS2/2) fragments substituting bridging sulfur between corner- and edge-sharing GeS4/2 tetrahedra. This structural evolution results in a significant monotonic decrease of the glass transition temperatures from 480 to 270 °C. The room-temperature dc conductivity changes non-monotonically with increasing HgS content x over a limited range of 4 × 10-15 to 7 × 10-13 S cm-1. The electronic transport in insulating HgS-GeS2 glasses occurs via extended electronic states. Tetrahedral HgS4/4 fragments also appear in the glass network with increasing x. Their exact population needs further advanced structural studies using diffraction techniques.
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Affiliation(s)
- Rayan Zaiter
- Université du Littoral Côte d'Opale (ULCO), LPCA, EA 4493, F-59140 Dunkerque, France
| | - Mohammad Kassem
- Université du Littoral Côte d'Opale (ULCO), LPCA, EA 4493, F-59140 Dunkerque, France
| | - Maria Bokova
- Université du Littoral Côte d'Opale (ULCO), LPCA, EA 4493, F-59140 Dunkerque, France
| | - Arnaud Cuisset
- Université du Littoral Côte d'Opale (ULCO), LPCA, EA 4493, F-59140 Dunkerque, France
| | - Eugene Bychkov
- Université du Littoral Côte d'Opale (ULCO), LPCA, EA 4493, F-59140 Dunkerque, France
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Zeidler A, Salmon PS, Whittaker DAJ, Piarristeguy A, Pradel A, Fischer HE, Benmore CJ, Gulbiten O. Structure of semiconducting versus fast-ion conducting glasses in the Ag-Ge-Se system. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171401. [PMID: 29410843 PMCID: PMC5792920 DOI: 10.1098/rsos.171401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 12/01/2017] [Indexed: 06/08/2023]
Abstract
The transition from a semiconductor to a fast-ion conductor with increasing silver content along the Ag x (Ge0.25Se0.75)(100-x) tie line (0≤x≤25) was investigated on multiple length scales by employing a combination of electric force microscopy, X-ray diffraction, and neutron diffraction. The microscopy results show separation into silver-rich and silver-poor phases, where the Ag-rich phase percolates at the onset of fast-ion conductivity. The method of neutron diffraction with Ag isotope substitution was applied to the x=5 and x=25 compositions, and the results indicate an evolution in structure of the Ag-rich phase with change of composition. The Ag-Se nearest-neighbours are distributed about a distance of 2.64(1) Å, and the Ag-Se coordination number increases from 2.6(3) at x=5 to 3.3(2) at x=25. For x=25, the measured Ag-Ag partial pair-distribution function gives 1.9(2) Ag-Ag nearest-neighbours at a distance of 3.02(2) Å. The results show breakage of Se-Se homopolar bonds as silver is added to the Ge0.25Se0.75 base glass, and the limit of glass-formation at x≃28 coincides with an elimination of these bonds. A model is proposed for tracking the breakage of Se-Se homopolar bonds as silver is added to the base glass.
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Affiliation(s)
- Anita Zeidler
- Department of Physics, University of Bath, Bath BA2 7AY, UK
| | | | | | - Andrea Piarristeguy
- Institut Charles Gerhardt, UMR 5253 CNRS, CC 1503, Université de Montpellier, Pl. E. Bataillon, 34095 Montpellier Cedex 5, France
| | - Annie Pradel
- Institut Charles Gerhardt, UMR 5253 CNRS, CC 1503, Université de Montpellier, Pl. E. Bataillon, 34095 Montpellier Cedex 5, France
| | - Henry E. Fischer
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Chris J. Benmore
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, IL 60439, USA
| | - Ozgur Gulbiten
- Science and Technology Division, Corning Incorporated, Corning, NY 14831, USA
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Drewitt JWE, Salmon PS, Zeidler A, Benmore CJ, Hannon AC. Structure of rare-earth chalcogenide glasses by neutron and x-ray diffraction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:225703. [PMID: 28452340 DOI: 10.1088/1361-648x/aa68c0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The method of neutron diffraction with isomorphic substitution was used to measure the structure of the rare-earth chalcogenide glasses [Formula: see text](Ga2 X 3)0.33(GeX 2)0.60 with [Formula: see text] or Ce and [Formula: see text] or Se. X-ray diffraction was also used to measure the structure of the sulphide glass. The results are consistent with networks that are built from GeX 4 and GaX 4 tetrahedra, and give R-S and R-Se coordination numbers of 8.0(2) and 8.5(4), respectively. The minimum nearest-neighbour R-R distance associated with rare-earth clustering is discussed.
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Affiliation(s)
- James W E Drewitt
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ, United Kingdom
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Bytchkov A, Cuello GJ, Kohara S, Benmore CJ, Price DL, Bychkov E. Unraveling the atomic structure of Ge-rich sulfide glasses. Phys Chem Chem Phys 2013; 15:8487-94. [DOI: 10.1039/c3cp50536g] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Salmon PS, Zeidler A. Identifying and characterising the different structural length scales in liquids and glasses: an experimental approach. Phys Chem Chem Phys 2013; 15:15286-308. [DOI: 10.1039/c3cp51741a] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Wurden C, Page K, Llobet A, White CE, Proffen T. Extracting differential pair distribution functions usingMIXSCAT. J Appl Crystallogr 2010. [DOI: 10.1107/s0021889810009155] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Differently weighted experimental scattering data have been used to extract partial or differential structure factors or pair distribution functions in studying many materials. However, this is not done routinely partly because of the lack of user-friendly software. This paper presentsMIXSCAT, a new member of theDISCUSprogram package.MIXSCATallows one to combine neutron and X-ray pair distribution functions and extract their respective differential functions.
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Crawford N, Schrodt C, Rothenberger A, Shi W, Ahlrichs R. DFT Modeling of Silver Disorder and Mobility in the Semiconductor Cluster [Ag28S26(P(O)PhOMe)12(PPh3)12]. Chemistry 2007; 14:319-24. [DOI: 10.1002/chem.200701119] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Martin RA, Salmon PS, Fischer HE, Cuello GJ. Identification of the relative distribution of rare-earth ions in phosphate glasses. PHYSICAL REVIEW LETTERS 2003; 90:185501. [PMID: 12786018 DOI: 10.1103/physrevlett.90.185501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2003] [Indexed: 05/24/2023]
Abstract
The relative distribution of rare-earth ions R3+ (Dy3+ or Ho3+) in the phosphate glass RAl(0.30)P(3.05)O(9.62) was measured by employing the method of isomorphic substitution in neutron diffraction. It is found that 7.9(7) R-R nearest neighbors reside at 5.62(6) A in a network made from interlinked PO4 tetrahedra. Provided that the role of Al is explicitly considered, a self-consistent account of the local matrix atom correlations can be developed in which there are 1.68(9) bridging and 2.32(9) terminal oxygen atoms per phosphorus.
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Affiliation(s)
- Richard A Martin
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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High-Resolution Electron Microscopy, Neutron Diffraction with Isotopic Substitution and X-Ray Absorption Fine Structure for the Characterisation of Active Sites in Oxide Catalysts. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0167-2991(01)80131-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Turner JFC, Benmore CJ, Barker CM, Kaltsoyannis N, Thomas JM, David WIF, Catlow CRA. Probing the Nature of Acetylene Bound to the Active Site of a NiNa−Zeolite Y Catalyst by in situ Neutron Scattering. J Phys Chem B 2000. [DOI: 10.1021/jp0017994] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John F. C. Turner
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
| | - Chris J. Benmore
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
| | - Carolyn M. Barker
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
| | - Nikolas Kaltsoyannis
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
| | - John Meurig Thomas
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
| | - William I. F. David
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
| | - C. Richard A. Catlow
- The Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 OQX, U.K., and Centre of Theoretical and Computational Chemistry, University College London, Gower Street, London WC1E 6BT, U.K
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