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Littérature scientifique sur le sujet « Crystal Polymorphism »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 6 septembre 2023

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Articles de revues sur le sujet "Crystal Polymorphism"

1

Yang, Yuxin, Jia Liu, Anna Hu, Ting Nie, Zeneng Cheng, and Wenjie Liu. "A Critical Review on Engineering of d-Mannitol Crystals: Properties, Applications, and Polymorphic Control." Crystals 12, no. 8 (2022): 1080. http://dx.doi.org/10.3390/cryst12081080.

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d-mannitol is a common six-carbon sugar alcohol, which is widely used in food, chemical, pharmaceutical, and other industries. Polymorphism is defined as the ability of materials to crystallize into different crystal structures. It has been reported for a long time that d-mannitol has three polymorphs: β, δ, and α. These different polymorphs have unique physicochemical properties, thus affecting the industrial applications of d-mannitol. In this review, we firstly introduced the characteristics of different d-mannitol polymorphs, e.g., crystal structure, morphology, molecular conformational en

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G, Nithya, Sudha R, and Charles C. Kanakam. "Polymorphic behavior of an organic compound." Asian Journal of Pharmaceutical and Clinical Research 10, no. 4 (2017): 259. http://dx.doi.org/10.22159/ajpcr.2017.v10i4.16702.

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Objective: Polymorphic crystals were exhibited in many organic compounds. The frequency changes, relative intensities, band contours, and numberof bands were observed in the spectra of different polymorphism which may be due to molecule-molecule interactions in the crystal unit cells. Theshape of a molecule at its site in the unit cell is distorted by molecular interactions.Methods: The identification of a pure crystal form and to quantify a mixture of two forms infrared and Raman spectra of different crystalline formsof the same organic compound can be used. 2’-chloro-4-methoxy-3-nitro benzil

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Kersten, Kortney, Ramanpreet Kaur, and Adam Matzger. "Survey and analysis of crystal polymorphism in organic structures." IUCrJ 5, no. 2 (2018): 124–29. http://dx.doi.org/10.1107/s2052252518000660.

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With the intention of producing the most comprehensive treatment of the prevalence of crystal polymorphism among structurally characterized materials, all polymorphic compounds flagged as such within the Cambridge Structural Database (CSD) are analysed and a list of crystallographically characterized organic polymorphic compounds is assembled. Classifying these structures into subclasses of anhydrates, salts, hydrates, non-hydrated solvates and cocrystals reveals that there are significant variations in polymorphism prevalence as a function of crystal type, a fact which has not previously been

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Surov, Artem O., Katarzyna A. Solanko, Andrew D. Bond, Annette Bauer-Brandl, and German L. Perlovich. "Polymorphism of felodipine co-crystals with 4,4′-bipyridine." CrystEngComm 16, no. 29 (2014): 6603–11. http://dx.doi.org/10.1039/c4ce00756e.

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The calcium-channel blocking agent felodipine forms co-crystals with 4,4′-bipyridine with 1 : 1 and 2 : 1 molar ratios. The co-crystal with 1 : 1 molar ratio exists in two polymorphic forms. The co-crystals polymorphism was investigated by X-ray diffraction, DSC, solution calorimetry and Hirshfeld surfaces analysis.

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Schmidtmann, Marc, Derek S. Middlemiss, and Chick C. Wilson. "Isotopomeric polymorphism in a “doubly-polymorphic” multi-component molecular crystal." CrystEngComm 17, no. 28 (2015): 5273–79. http://dx.doi.org/10.1039/c5ce00123d.

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Isotopomeric polymorphism is observed in complexes of isonicotinamide with oxalic acid, highly unusual here in that each isotopic complex is itself polymorphic, a situation of “double polymorphism”. The four polymorphic forms exhibit different degrees of hydron transfer.

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Dabić, Predrag, Marko G. Nikolić, Sabina Kovač, and Aleksandar Kremenović. "Polymorphism and photoluminescence properties of K3ErSi2O7." Acta Crystallographica Section C Structural Chemistry 75, no. 10 (2019): 1417–23. http://dx.doi.org/10.1107/s2053229619011926.

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Two polymorphs of tripotassium erbium disilicate, K3ErSi2O7, were synthesized by high-temperature flux crystal growth during the exploration of the flux technique for growing new alkali rare-earth elements (REE) containing silicates. Their crystal structures were determined by single-crystal X-ray diffraction analysis. One of them (denoted 1) crystallizes in the space group P63/mmc and is isostructural with disilicates K3LuSi2O7, K3ScSi2O7 and K3YSi2O7, while the other (denoted 2) crystallizes in the space group P63/mcm and is isostructural with disilicates K3NdSi2O7, K3REESi2O7 (REE = Gd–Yb),

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Ghazani, Saeed M., and Alejandro G. Marangoni. "Molecular Origins of Polymorphism in Cocoa Butter." Annual Review of Food Science and Technology 12, no. 1 (2021): 567–90. http://dx.doi.org/10.1146/annurev-food-070620-022551.

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Cocoa butter displays complex crystallization behavior and six crystal polymorphic forms. Although the crystal structure of cocoa butter has been studied extensively, the molecular interactions between cocoa butter triacylglycerols in relation to polymorphic transformations from metastable forms (forms III and IV) to stable crystal forms (forms V and VI) remain largely unknown. In this review, the triclinic polymorphism and melting profiles of the major triacylglycerols in cocoa butter—POP, POS, and SOS—are reviewed, and their binary and ternary phase behaviors in metastable (pseudoβ′) and sta

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Akune, Yoko, Risa Hirosawa, Atsushi Koseki, and Shinya Matsumoto. "Role of halogen substituents in a series of polymorphic 2,5-diamino-3,6-dicyanopyrazine derivatives with highly flexible groups." Zeitschrift für Kristallographie - Crystalline Materials 232, no. 5 (2017): 395–405. http://dx.doi.org/10.1515/zkri-2016-2007.

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AbstractThe crystal structures of the ortho-X-benzyl derivatives, where X=F, Cl, Br, I, and Me, of 2,5-bis(N,N-dibenzylamino)-3,6-dicyanopyrazine dyes (C34H24N6X4) were analysed to evaluate the effect of a systematic series of structures on the occurrence of polymorphism. Detailed crystal structure analysis indicated that the thermally stable forms of the polymorphic derivatives (Cl and Br derivatives) were close-packed, whereas those of the non-polymorphic derivatives (F and I derivatives) were stabilised by an intermolecular interaction involving the ortho-substituents. In the thermally meta

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Kant, Rajni. "Pharmaceutical Drug Polymorphism: A Case Study of Three Novel Drugs." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C544. http://dx.doi.org/10.1107/s2053273314094558.

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Polymorphism is more widespread in pharmaceutical solids, with estimates of 30-50% in drug-like molecules, compared to 4-5% polymorphic crystals in the Cambridge Structural Database (Nangia, 2007). Most of the drug molecules are formulated and marketed in crystalline form and many of these are highly functionalized and can self-organize in several ways in the solid state with nearly the same lattice energies. Though a lot of work is going on in the field of pharmaceutical drug polymorphism and its possible application in the field of crystal engineering, yet there are difficulties in getting p

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Parambil, Jose V., Sendhil K. Poornachary, Jerry Y. Y. Heng, and Reginald B. H. Tan. "Template-induced nucleation for controlling crystal polymorphism: from molecular mechanisms to applications in pharmaceutical processing." CrystEngComm 21, no. 28 (2019): 4122–35. http://dx.doi.org/10.1039/c9ce00404a.

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The major factors governing template-induced nucleation of molecular crystals are assessed, highlighting applications in pharmaceutical manufacturing and formulation processes where the templating effect is used to promote crystal nucleation and for controlling crystal polymorphism.

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Thèses sur le sujet "Crystal Polymorphism"

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Svärd, Michael. "Crystal Polymorphism of Substituted Monocyclic Aromatics." Licentiate thesis, KTH, Chemical Engineering and Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10501.

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Svärd, Michael. "Crystal polymorphism of substituted monocyclic aromatics /." Stockholm : Skolan för kemivetenskap, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10501.

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Nieuwenhuyzen, Mark. "Crystal engineering and polymorphism : aspects of hydrogen bonding." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301029.

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Zelaya, Carlos A. "6,6’-Dimethoxygossypol: Molecular Structure, Crystal Polymorphism, and Solvate Formation." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/136.

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6,6’-Dimethoxygossypol (DMG) is a natural product of the cotton variety Gossypium barbadense and a derivative of gossypol. Gossypol has been shown to form an abundant number of clathrates with a large variety of compounds. One of the primary reasons why gossypol can form clathrates has been because of its ability to from extensive hydrogen bonding networks due to its hydroxyl and aldehyde functional groups. Prior to this work, the only known solvate that DMG formed was with acetic acid. DMG has methoxy groups substituted at two hydroxyl positions, and consequently there is a decrease in its ab

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Asmadi, Aldi. "Crystal structure prediction : a molecular modellling study of the solid state behaviour of small organic compounds." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4441.

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The knowledge of the packing behaviour of small organic compounds in crystal lattices is of great importance for industries dealing with solid state materials. The properties of materials depend on how the molecules arrange themselves in a crystalline environment. Crystal structure prediction provides a theoretical approach through the application of computational strategies to seek possible crystal packing arrangements (or polymorphs) a compound may adopt. Based on the chemical diagrams, this thesis investigates polymorphism of several small organic compounds. Plausible crystal packings of th

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Shattock, Tanise R. "Crystal engineering of co-crystals and their relevance to pharmaceutical forms." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002101.

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Hao, Xiang. "STUDIES OF UNUSUAL PACKING AND OF POLYMORPHISM IN TWO CRYSTAL SYSTEMS." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_diss/285.

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Crystal structures of anhydrous pinacol, the hexagonal pinacol, pinacol monohydrate, and pinacol hexahydrate were studied. In all the structures crystal packing is unusual and complicated. The origin of the complexity may be the difficulty in filling space densely and while also satisfying the H-bonding requirements when the molecule has few internal degrees of freedom. Five 15-crown-5 complexes of M(NO3)2 (M = Cu, Zn, Mg, Co, Mn) were synthesized and characterized using X-ray diffraction and differential scanning calorimetry. The system is rich in polymorphs. Nine definite solid-state phases

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BERGANTIN, STEFANO. "Organic semiconductor rubrene: crystal chemistry of derivatives and high-pressure polymorphism." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/50223.

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Electronic devices based on organic molecules, displaying interesting semiconducting properties, have recently become commercially available after being widely studied for more than twenty years. The focus of the present thesis is the organic semiconductor rubrene, a very promising material in the field of organic electronics, due to its outstanding charge transport properties. The crystal structure of the rubrene derivatives synthesized up to now, to improve the poor solubility of the pristine molecule and its low stability towards oxidation, were analyzed; this was done in order to identify

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Karamertzanis, P. G., G. M. Day, G. W. A. Welch, et al. "Modeling the interplay of inter- and intramolecular hydrogen bonding in conformational polymorphs." American Institute of Physics, 2011. http://hdl.handle.net/10454/4734.

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no<br>The predicted stability differences of the conformational polymorphs of oxalyl dihydrazide and ortho-acetamidobenzamide are unrealistically large when the modeling of intermolecular energies is solely based on the isolated-molecule charge density, neglecting charge density polarization. Ab initio calculated crystal electron densities showed qualitative differences depending on the spatial arrangement of molecules in the lattice with the greatest variations observed for polymorphs that differ in the extent of inter- and intramolecular hydrogen bonding. We show that accounting for inductio

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Chan, Fung Choy. "Powder X-ray diffraction studies of structural and kinetic aspects of polymorphism." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327050.

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Livres sur le sujet "Crystal Polymorphism"

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Ahn, Shinbyoung. Polymorphism, phase transformations and crystal engineering of hydrogen-bonded solids. University of Birmingham, 1999.

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Bernstein, Joel. Polymorphism in molecular crystals. Oxford University Press, 2007.

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Sebastian, M. T. Random, non-random, and periodic faulting incrystals. Gordon and Breach, 1994.

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Chandrasekhar, S. Liquid crystals. 2nd ed. Cambridge University Press, 1992.

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P, Krishna, ed. Random, non-random, and periodic faulting in crystals. Gordon and Breach Science Publishers, 1994.

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Bernstein, Joel. Polymorphism in Molecular Crystals. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780199655441.001.0001.

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First recognized in 1822, polymorphism of crystals is now a widely recognized and observed phenomenon, with both fundamental and commercial ramifications in disciplines and industries that study and utilize solid forms of matter. The purpose of this edition is to summarize and to bring up to date the current knowledge and understanding of polymorphism in molecular crystals, and to concentrate it in one source. The information has been gleaned from a wide variety (~2500) of sources in the open literature; however, because of the increasing commercial importance of the phenomenon, a significant

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Karl, N. Organic Crystals I: Characterization (Crystals--Growth, Properties, and Applications). Springer, 1991.

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8

Trukhin, Anatoly. Silicon Dioxide and the Luminescence of Related Materials: Crystal Polymorphism and the Glass State. Cambridge Scholars Publisher, 2021.

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Bernstein, Joel. Polymorphism in Molecular Crystals. Oxford University Press, 2019.

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Bernstein, Joel. Polymorphism in Molecular Crystals. Ebsco Publishing, 2002.

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Chapitres de livres sur le sujet "Crystal Polymorphism"

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Belviso, Benny Danilo. "Crystal Polymorphism." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_1127.

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Belviso, Benny Danilo. "Crystal Polymorphism." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_1127-2.

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Braga, Dario, Fabrizia Grepioni, Lucia Maini, and Marco Polito. "Crystal Polymorphism and Multiple Crystal Forms." In Molecular Networks. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01367-6_7.

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Braga, Dario, Fabrizia Grepioni, Lucia Maini, and Marco Polito. "Crystal Polymorphism and Multiple Crystal Forms." In Molecular Networks. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/430_2008_7.

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Bernstein, Joel, and Jill MacAlpine. "Pharmaceutical Crystal Forms and Crystal-Form Patents: Novelty and Obviousness1." In Polymorphism in the Pharmaceutical Industry. Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527697847.ch16.

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Aitipamula, Srinivasulu. "Polymorphism in Molecular Crystals and Cocrystals." In Advances in Organic Crystal Chemistry. Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55555-1_14.

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Lotz, Bernard. "Crystal Polymorphism and Morphology of Polylactides." In Synthesis, Structure and Properties of Poly(lactic acid). Springer International Publishing, 2017. http://dx.doi.org/10.1007/12_2016_15.

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Braga, Dario, and Fabrizia Grepioni. "Polymorphism, Crystal Transformations and Gas-Solid Reactions." In Crystal Design: Structure and Function. John Wiley & Sons, Ltd, 2003. http://dx.doi.org/10.1002/0470868015.ch8.

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Sarma, Jagarlapudi A. R. P., and Gautam R. Desiraju. "Polymorphism and Pseudopolymorphism in Organic Crystals." In Crystal Engineering The Design and Application of Functional Solids. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9105-8_15.

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Kopp, S., J. C. Wittmann, and B. Lotz. "Epitaxy and Crystal Polymorphism of Isotactic Polybutene-1." In Crystallization of Polymers. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1950-4_67.

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Actes de conférences sur le sujet "Crystal Polymorphism"

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Nakanishi, Atsushi, Koichiro Akiyama, Shohei Hayashi, Hiroshi Satozono, and Kazuue Fujita. "Imaging identification of pharmaceutical material by using terahertz difference-frequency generation semiconductor source." In Conference on Lasers and Electro-Optics/Pacific Rim. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.p_cm3_01.

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We demonstrated imaging identification of pharmaceutical material using a compact ultra-broadband terahertz semiconductor source. We could obtain THz false-color RGB images from plural frequency information. We demonstrated the ability to distinguish the pharmaceutical materials having different crystal forms by using the THz DFG source. Polymorphism, hydrate forms, and crystallinity of pharmaceutical materials can be distinguished using this method.

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Yang, C. Y., Y. Yang, and S. Hotta. "Crystal structure and polymorphism of dimethyl-oligothiophenes crystallized epitaxially on highly oriented PTFE thin films." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835400.

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Gibon, Veronique, Bastien Jacquet, Christophe Blecker, and Sabine Danthine. "Isothermal Crystallization of Palm Olein with Different Seeding Methods." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/fhgs1856.

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This work concerns the use of different types of seeding agents and their effect on the isothermal crystallization of palm olein. In dry fractionation, palm olein usually shows slow crystallization, and seeding is a way to overcome this problematic. Starting with an olein iodine value ~ 57, experiments were conducted isothermally (15 °C and 17 °C) under shear, at lab-scale with a double-jacketed vessel. Different solutions were tested and compared: blending with palm oil, blending with palm stearin, addition of polyglycerol esters and addition of stearin micro-crystals. Crystallization kinetic

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Cosmidis, Julie, and Alexis Templeton. "Carbonate polymorphism controlled by iron redox dynamics at a natural CO₂leakage site (Crystal Geyser, Utah)." In Goldschmidt2021. European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.3831.

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Rhoades, Alicyn Marie, Nichole Wonderling, Anne Gohn, et al. "Effect of cooling rate on the crystal polymorphism in beta-nucleated isotactic polypropylene as revealed by a combined WAXS/FSC analysis." In VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949651.

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Herrera, Maria Lidia, Karina Dafne Martinez, Maria Ramos, Roberto Candal, Victor Alonso Garcia Londoño, and Virginia Borroni. "Effects of processing conditions and emulsifiers addition of crystallization kinetics and polymorphism of cupuassu fat and its fractions." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/dcui3885.

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A- A+ The effects of processing conditions and addition of the sucrose esters S-170 and P-170 on crystallization kinetics and polymorphism of cupuassu fat and its fractions obtained at 29, 26, and 24 °C were study by polarized light microscopy, differential scanning calorimetry, and in situ small-angle (SAXS) and wide angle (WAXS) X-ray scattering using synchrotron light. Polymorphic transitions were followed in real time tempering samples with a thermal cycle or crystallizing them isothermally at different cooling rates. Cupuassu fat and stearin fractions obtained at 26 and 24°C crystallized

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Kuczynski, Wojciech, and Horst Stegemeyer. "Polymorphism of twist grain boundary phases near the chiral NAC point." In Liquid Crystals, edited by Jolanta Rutkowska, Stanislaw J. Klosowicz, Jerzy Zielinski, and Jozef Zmija. SPIE, 1998. http://dx.doi.org/10.1117/12.299944.

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Seilert, Julia, and Eckhard Floter. "Relating polymorphic transition and triglyceride composition." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/uiuq2084.

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Structuring fats are complex triglyceride (TAG) mixtures characterized by diverse crystallization events. These range from co- and subsequent crystallization of different fractions determined by the mixture's phase behavior, i.e., solid immiscibility, to polymorphism shaping the overall crystallization kinetics. The kinetics behind polymorphism differ depending on TAG type and fractions, complicating this even more. Several experimental studies have shown that multiple-step crystallization takes place, in which, in most cases, the first step is assigned to the formation of Î±-crystals followed

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Maes, Dominique, James Lutsko, Quentin Galand, and Margot Van Nerom. "The effect of controlled mixing on ROY-polymorphism." In The 3rd International Online Conference on Crystals. MDPI, 2022. http://dx.doi.org/10.3390/iocc_2022-12152.

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Maes, Dominique, James Lutsko, Quentin Galand, and Margot Van Nerom. "The effect of controlled mixing on ROY-polymorphism." In The 3rd International Online Conference on Crystals. MDPI, 2022. http://dx.doi.org/10.3390/iocc_2022-12152.

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