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Moreno S, Royo D, El-Hachimi AG, Rodríguez-Castillo M, Monge M, Olmos ME, López-de-Luzuriaga JM. Vapochromic behaviour of a gold(I)-lead(II) complex as a VOC sensor. Dalton Trans 2023; 52:17119-17131. [PMID: 37800283 DOI: 10.1039/d3dt02000b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
The reaction among [Au2Ag2(C6F5)4(OEt2)2]n, PbCl2 and terpyridine leads to the polymeric complex [{Au(C6F5)2}2{Pb(terpy)}]n (1). Its crystal structure reveals potential voids close to the lead centres large enough to hold different molecules. The availability of these free sites allows complex 1 to act as a VOC sensor. Thus, when 1 is exposed to different solvent vapours such as acetonitrile, toluene or THF, variations in its solid appearance and its photophysical properties are observed as a consequence of the formation of the new polymorphs [{Au(C6F5)2}2{Pb(terpy)(CH3CN)2}]n (2), [{Au(C6F5)2}2{Pb(terpy)}]n·Tol (3) and [{Au(C6F5)2}2{Pb(terpy)(THF)}]n·THF (4). Each polymorph displays a different emission energy depending on its structure and the presence of metallophilic interactions. In addition, the reversible solvent molecule exchange allows the tuning of the luminescence emissions in the greenish yellow-red range. DFT and TD-DFT calculations were performed to explain the origin of the luminescence of all these complexes.
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Affiliation(s)
- Sonia Moreno
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
| | - David Royo
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
| | - Abdel G El-Hachimi
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
| | - María Rodríguez-Castillo
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
| | - Miguel Monge
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
| | - M Elena Olmos
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
| | - José M López-de-Luzuriaga
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Complejo Científico-Tecnológico, 26006 - Logroño, Spain.
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2
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Salazar-Rojas D, Kaufman TS, Maggio RM. A comprehensive approach toward concomitant triclabendazole polymorphism in pharmaceutical products. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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The Lisbon Supramolecular Green Story: Mechanochemistry towards New Forms of Pharmaceuticals. MOLECULES (BASEL, SWITZERLAND) 2020; 25:molecules25112705. [PMID: 32545242 PMCID: PMC7321153 DOI: 10.3390/molecules25112705] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/31/2020] [Accepted: 06/05/2020] [Indexed: 01/23/2023]
Abstract
This short review presents and highlights the work performed by the Lisbon Group on the mechanochemical synthesis of active pharmaceutical ingredients (APIs) multicomponent compounds. Here, we show some of our most relevant contributions on the synthesis of supramolecular derivatives of well-known commercial used drugs and the corresponding improvement on their physicochemical properties. The study reflects, not only our pursuit of using crystal engineering principles for the search of supramolecular entities, but also our aim to correlate them with the desired properties. The work also covers our results on polymorphic screening and describes our proposed alternatives to induce and maintain specific polymorphic forms, and our approach to avoid polymorphism using APIs as ionic liquids. We want to stress that all the work was performed using mechanochemistry, a green advantageous synthetic technique.
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Xing C, Zhang GS, Gong NB, hua Du G, Lu Y. New crystal forms and amorphous phase of sophoricoside: X-ray structures and characterization. ROYAL SOCIETY OPEN SCIENCE 2019; 6:181905. [PMID: 30800407 PMCID: PMC6366211 DOI: 10.1098/rsos.181905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 12/18/2018] [Indexed: 06/09/2023]
Abstract
Sophoricoside, which is an isoflavone glycoside found in many plant species, has recently attracted attention because of its anti-fertility activity. One solvent-free form, two solvatomorphs and an amorphous phase of sophoricoside are reported for the first time. X-ray diffractometry, differential scanning calorimetry, thermal gravimetric analysis and Fourier-transform infrared spectroscopy were used to characterize the different forms. The results show that factors such as crystal symmetry, intermolecular arrangement, conformational flexibility, hydrogen-bonding interactions and solvent incorporation lead to different solid-state forms. An investigation of the transformations of the four forms showed that they can interconvert with each other under certain conditions. Amorphous phase and solvatomorphism were unstable but can improve the solubility of sophoricoside in water.
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Affiliation(s)
- Cheng Xing
- Beijing Key Laboratory of Polymorphic Drugs, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Guo shun Zhang
- Beijing Key Laboratory of Polymorphic Drugs, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Ning bo Gong
- Beijing Key Laboratory of Polymorphic Drugs, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Guan hua Du
- Beijing City Key Laboratory of Drug Target Identification and Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Yang Lu
- Beijing Key Laboratory of Polymorphic Drugs, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
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Alin J, Setiawan N, Defrese M, DiNunzio J, Lau H, Lupton L, Xi H, Su Y, Nie H, Hesse N, Taylor LS, Marsac PJ. A novel approach for measuring room temperature enthalpy of mixing and associated solubility estimation of a drug in a polymer matrix. POLYMER 2018. [DOI: 10.1016/j.polymer.2017.11.056] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Recent progress of structural study of polymorphic pharmaceutical drugs. Adv Drug Deliv Rev 2017; 117:71-85. [PMID: 27940141 DOI: 10.1016/j.addr.2016.12.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/02/2016] [Accepted: 12/06/2016] [Indexed: 12/20/2022]
Abstract
This review considers advances in the understanding of active pharmaceutical ingredient polymorphism since around 2010 mainly from a structural view point, with a focus on twelve model drugs. New polymorphs of most of these drugs have been identified despite that the polymorphism of these old drugs has been extensively studied so far. In addition to the conventional modifications of preparative solvents, temperatures, and pressure, more strategic structure-based methods have successfully yielded new polymorphs. The development of analytical techniques, including X-ray analyses, spectroscopy, and microscopy has facilitated the identification of unknown crystal structures and also the discovery of new polymorphs. Computational simulations have played an important role in explaining and predicting the stability order of polymorphs. Furthermore, these make significant contributions to the design of new polymorphs by considering structure and energy. The new technologies and insights discussed in this review will contribute to the control of polymorphic forms, both during manufacture and in the drug formulation.
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Vega DR, Halac E, Segovia L, Baggio R. A New, More Stable Polymorphic Form of Otilonium Bromide: Solubility, Crystal Structure, and Phase Transformation. J Pharm Sci 2016; 105:3013-3020. [PMID: 27444388 DOI: 10.1016/j.xphs.2016.06.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 05/06/2016] [Accepted: 06/01/2016] [Indexed: 12/19/2022]
Abstract
A new polymorphic form of otilonium bromide is presented (Form I), and a thorough analysis of its crystal and molecular structure is performed. The compound suffers a temperature-driven first-order phase transition at about 396 K, which transforms it into the polymorph reported by Dapporto P and Sega A (Acta Cryst. 1986;C42:474-478) (Form II). Through thermal analysis and solubility experiments the relative stability of both crystal modifications were determined, confirming that at room temperature this new Form I is the more stable one, Form II existing just in a metastable state.
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Affiliation(s)
- Daniel R Vega
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina; Escuela de Ciencia y Tecnología, Universidad Nacional General San Martín, Buenos Aires, Argentina
| | - Emilia Halac
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina; Escuela de Ciencia y Tecnología, Universidad Nacional General San Martín, Buenos Aires, Argentina
| | - Luciano Segovia
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Ricardo Baggio
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina.
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8
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Patel J, Jagia M, Bansal AK, Patel S. Characterization and Thermodynamic Relationship of Three Polymorphs of a Xanthine Oxidase Inhibitor, Febuxostat. J Pharm Sci 2015; 104:3722-3730. [DOI: 10.1002/jps.24570] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Revised: 05/18/2015] [Accepted: 06/05/2015] [Indexed: 11/07/2022]
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9
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Hisaki I, Kometani E, Tohnai N, Miyata M. Gelation or crystallization? Subtle balance of structural factors for assembly of DBA derivatives with methyl esters. CrystEngComm 2015. [DOI: 10.1039/c5ce00778j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The aggregation of a series of strained dehydrobenzoannulene derivatives with methyl ester groups is revealed.
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Affiliation(s)
- Ichiro Hisaki
- Graduate School of Engineering
- Osaka University
- Suita Osaka 565-0871, Japan
| | - Eriko Kometani
- Graduate School of Engineering
- Osaka University
- Suita Osaka 565-0871, Japan
| | - Norimitsu Tohnai
- Graduate School of Engineering
- Osaka University
- Suita Osaka 565-0871, Japan
| | - Mikiji Miyata
- Graduate School of Engineering
- Osaka University
- Suita Osaka 565-0871, Japan
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11
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Luo YH, Sun BW. Two new metastable forms of 6-chloroquinolin-2(1H)-one: crystal structure, Hirshfeld surfaces and spectroscopic studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 120:381-388. [PMID: 24211619 DOI: 10.1016/j.saa.2013.10.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 10/06/2013] [Accepted: 10/09/2013] [Indexed: 06/02/2023]
Abstract
Two new metastable crystalline forms of 6-chloroquinolin-2(1H)-one (forms II and III), which were induced by two kinds of 3D inorganic anions (ClO4- and BF4-), have been prepared and characterized in this work. We performed single-crystal diffraction, X-ray powder diffraction (XRPD), Hirshfeld surfaces, solid-state vibrational spectroscopy (IR) and thermal analysis (DSC, TGA) to these two new forms as well as the original one (form I). Form I featured with 1D chain, while form II and III featured with dimeric unit with stronger π⋯π and hydrogen bonds interactions. The 3D inorganic anions force the self-assemble behavior of 6-chloroquinolin-2(1H)-one molecules from 1D chain structure (form I) to dimeric unit (forms II and III) due to their large steric hindrance, and different anions induced different orientations for dimeric unit. These transformations lead to the increase of N-H⋯O, π⋯π, and Cl-Cl intermolecular interactions, which lead to blue shift of IR spectra in 1700-1500 cm(-1) region as well as luminescence peaks, while red shift of IR spectra in 650-550 cm(-1) region.
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Affiliation(s)
- Yang-Hui Luo
- College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
| | - Bai-Wang Sun
- College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China.
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Abstract
Solid crystalline phases containing two cocrystallized components offer a new development pathway whereby one can potentially improve the physical characteristics (i.e., equilibrium solubility, dissolution rate, solid-state stability, etc.) of a drug substance that exhibits a profile that is less than desirable. In this commentary, the topic of pharmaceutical cocrystals will be briefly explored, and a short exposition of the solubility and dissolution rate advantages that have been realized in various systems will be provided. The Guidance for Industry document recently proposed by United States Food and Drug Administration will be outlined, and its requirements explained. Finally, the subset of pharmaceutical cocrystals that consist of a drug substance and a salt of that substance (termed a salt cocrystal) will be examined to illustrate this additional class of pharmaceutical cocrystals that may offer significant scientific and regulatory advantages.
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Affiliation(s)
- Harry G Brittain
- Center for Pharmaceutical Physics, Milford, New Jersey 08848, USA.
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Zhang G, Gao L, Zhang Z, Wang L, Shao M. Heating-Induced Phase Transition of Bupropion Hydrobromide Polymorphs. J Pharm Sci 2012; 101:3091-5. [DOI: 10.1002/jps.22817] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 10/19/2011] [Accepted: 10/21/2011] [Indexed: 12/24/2022]
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14
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Brittain HG. Polymorphism and Solvatomorphism 2010. J Pharm Sci 2012; 101:464-84. [DOI: 10.1002/jps.22788] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 09/18/2011] [Accepted: 09/22/2011] [Indexed: 01/06/2023]
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15
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Butterhof C, Bärwinkel K, Senker J, Breu J. Polymorphism in co-crystals: a metastable form of the ionic co-crystal 2 HBz·1 NaBz crystallised by flash evaporation. CrystEngComm 2012. [DOI: 10.1039/c2ce25562f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Aguiar FA, do Carmo Malvar D, Kanashiro A, Seoane MF, Cuffini SL, Petto de Souza GE, de Gaitani CM. DETERMINATION OF DICLOFENAC SODIUM IN RABBIT PLASMA BY HPLC/UV: EVALUATION AND CHARACTERIZATION OF ITS CRYSTALLINE FORMS, ANHYDROUS AND HYDRATE, ON THE ANTIPYRETIC EFFECT. J LIQ CHROMATOGR R T 2012. [DOI: 10.1080/10826076.2011.633676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Fernando Armani Aguiar
- a Departamento de Ciências Farmacêuticas , Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Ribeirão Preto , São Paulo , Brazil
| | - David do Carmo Malvar
- b Departamento de Farmacologia , Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo , Ribeirão Preto , São Paulo , Brazil
| | - Alexandre Kanashiro
- b Departamento de Farmacologia , Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo , Ribeirão Preto , São Paulo , Brazil
| | - Maribel Ferro Seoane
- c Subsecretaría CEPROCOR, Ministerio de Ciencia y Tecnología – Córdoba , Córdoba , Argentina
| | - Silvia L. Cuffini
- d Departamento de Ciências Farmacêuticas , Universidade Federal de Santa Catarina , Florianópolis , Santa Catarina , Brazil
| | - Glória Emilia Petto de Souza
- e Departamento de Física e Química , Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Ribeirão Preto , São Paulo , Brazil
| | - Cristiane Masetto de Gaitani
- a Departamento de Ciências Farmacêuticas , Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Ribeirão Preto , São Paulo , Brazil
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Affiliation(s)
| | - Deniz Erdemir
- Bristol-Myers Squibb, New Brunswick, New Jersey 08903;
| | - Allan S. Myerson
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02130;
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Roy BN, Singh GP, Godbole HM, Nehate SP. Stabilization of quinapril by incorporating hydrogen bonding interactions. Indian J Pharm Sci 2011; 71:395-405. [PMID: 20502545 PMCID: PMC2865811 DOI: 10.4103/0250-474x.57288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 07/15/2009] [Accepted: 07/17/2009] [Indexed: 11/10/2022] Open
Abstract
In the present study stability of various known solvates of quinapril hydrochloride has been compared with nitromethane solvate. Nitromethane solvate was found to be more stable compared to other known solvates. Single crystal X-ray diffraction analysis of quinapril nitromethane solvate shows intermolecular hydrogen bonding between quinapril molecule and nitromethane. Stabilization of quinapril by forming strong hydrogen bonding network as in case of co-crystals was further studied by forming co-crystal with tris(hydroxymethyl)amino methane. Quinapril free base forms a stable salt with tris(hydroxymethyl)amino methane not reported earlier. Quinapril tris(hydroxymethyl)amino methane salt found to be stable even at 80° for 72 h i.e. hardly any formation of diketopiperazine and diacid impurity. As expected single crystal X-ray diffraction analysis reveals tris(hydroxymethyl)amino methane salt of quinapril shows complex hydrogen bonding network between the two entities along with ionic bond. The properties of this stable salt - stable in solid as well as solution phase, might lead to an alternate highly stable formulation.
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Affiliation(s)
- B N Roy
- Lupin Ltd. (Research Park), 46A, 47A - Nande Village, Mulshi Taluka, Pune-411 042, India
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Brittain HG. Polymorphism and Solvatomorphism 2009. J Pharm Sci 2011; 100:1260-79. [DOI: 10.1002/jps.22386] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2010] [Accepted: 09/29/2010] [Indexed: 12/27/2022]
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20
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Friščić T, Halasz I, Strobridge FC, Dinnebier RE, Stein RS, Fábián L, Curfs C. A rational approach to screen for hydrated forms of the pharmaceutical derivative magnesium naproxen using liquid-assisted grinding. CrystEngComm 2011. [DOI: 10.1039/c0ce00894j] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Lavric Z, Pirnat J, Luznik J, Seliger J, Zagar V, Trontelj Z, Srcic S. Application of 14N NQR to the Study of Piroxicam Polymorphism. J Pharm Sci 2010; 99:4857-65. [DOI: 10.1002/jps.22186] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Koradia V, de Diego HL, Elema MR, Rantanen J. Integrated approach to study the dehydration kinetics of nitrofurantoin monohydrate. J Pharm Sci 2010; 99:3966-76. [PMID: 20575054 DOI: 10.1002/jps.22244] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
There is a need for thorough knowledge of solid-state transformations in order to implement quality by design (QbD) methodology in drug development. The present study was aimed at gaining a mechanistic understanding of the dehydration of nitrofurantoin monohydrate II (NF-MH). The dehydration was studied using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), hot-stage microscopy (HSM), and variable temperature X-ray powder diffraction (VT-XRPD). Isothermal TGA data were used to study dehydration kinetics using model-fitting and model-free approaches. Model-fitting analysis indicated a good fit for several models derived from nucleation-growth and/or geometric contraction mechanisms. However, based on visual observations during HSM, Avrami-Erofeyev equations A3 and A4, indicating nucleation-growth phenomenon, were found to be the most suitable kinetic models. HSM showed initiation of dehydration with random nucleation, and nuclei coalesced with the progress of dehydration reaction. VT-XRPD revealed formation of anhydrate beta form on dehydration of NF-MH. The phenomenon of random nucleation is justified based on the crystal structure of NF-MH, which showed presence of water molecules in an isolated manner, prohibiting directional dehydration. It was found that supplementary information from HSM and VT-XRPD can be valuable to gain a better understanding of dehydration from formal solid-state kinetics analysis.
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Affiliation(s)
- Vishal Koradia
- Faculty of Pharmaceutical Sciences, Department of Pharmaceutics and Analytical Chemistry, University of Copenhagen, Copenhagen, Denmark
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Bettini R, Menabeni R, Tozzi R, Pranzo M, Pasquali I, Chierotti M, Gobetto R, Pellegrino L. Didanosine Polymorphism in a Supercritical Antisolvent Process. J Pharm Sci 2010; 99:1855-70. [DOI: 10.1002/jps.21962] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Brittain HG. Cocrystal systems of pharmaceutical interest: 2007-2008. PROFILES OF DRUG SUBSTANCES, EXCIPIENTS, AND RELATED METHODOLOGY 2010; 35:373-90. [PMID: 22469227 DOI: 10.1016/s1871-5125(10)35009-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Salager E, Stein RS, Pickard CJ, Elena B, Emsley L. Powder NMR crystallography of thymol. Phys Chem Chem Phys 2009; 11:2610-21. [PMID: 19421517 DOI: 10.1039/b821018g] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A protocol for the structure determination of powdered solids at natural abundance by NMR is presented and illustrated for the case of the small drug molecule thymol. The procedure uses proton spin-diffusion data from two-dimensional NMR experiments in combination with periodic DFT refinements incorporating (1)H and (13)C NMR chemical shifts. For thymol, the method yields a crystal structure for the powdered sample, which differs by an atomic root-mean-square-deviation (all atoms except methyl group protons) of only 0.07 A from the single crystal X-ray diffraction structure with DFT-optimized proton positions.
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Affiliation(s)
- Elodie Salager
- Université de Lyon, (CNRS/ENS-Lyon/UCB Lyon 1), Centre de RMN à Très Hauts Champs, 5 rue de la Doua, 69100, Villeurbanne, France
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Glasser L, Jones F. Systematic Thermodynamics of Hydration (and of Solvation) of Inorganic Solids. Inorg Chem 2009; 48:1661-5. [DOI: 10.1021/ic802101g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leslie Glasser
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia
| | - Franca Jones
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia
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