Isoenergetic Polymorphism: The Puzzle of Tolazamide as a Case Study |
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Authors: | Prof?Dr Elena V Boldyreva Sergey G Arkhipov Dr Tatiana N Drebushchak Dr Valeri A Drebushchak Dr Evgeniy A Losev Dr Alexander A Matvienko Dr Vasily S Minkov Denis A Rychkov Prof?Dr Yurii V Seryotkin Dr Jernej Stare Dr Boris A Zakharov |
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Institution: | 1. Institute of Solid State Chemistry and Mechanochemistry SB RAS, 18 Kutateladze str., 630128 Novosibirsk (Russian Federation), Fax: (+7)?383‐363‐41‐32;2. Novosibirsk State University, 2 Pirogov str., 630090 Novosibirsk (Russian Federation);3. Institute of Geology and Mineralogy, 3 Koptyuga pr., 630090 Novosibirsk (Russian Federation);4. National Institute of Chemistry, 19 Hajdrihova str., 1000 Ljubljana (Slovenia) |
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Abstract: | In the present case study of tolazamide we illustrate how many seemingly contradictory results that have been obtained from experimental observations and theoretical calculations can finally start forming a consistent picture: a “puzzle put together”. For many years, tolazamide was considered to have no polymorphs. This made this drug substance unique among the large family of sulfonylureas, which was known to be significantly more prone to polymorphism than many other organic compounds. The present work employs a broad and in‐depth analysis that includes the use of optical microscopy, single‐crystal and powder X‐ray diffraction, IR and Raman spectroscopies, DSC, semiempirical PIXEL calculations and DFT of three polymorphs of tolazamide. This case study shows how the polymorphs of a molecular crystal can be overlooked even if discovered serendipitously on one of numerous crystallizations, and how very different molecular packings can be practically isoenergetic but still crystallize quite selectively and transform one into another irreversibly upon heating. |
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Keywords: | calorimetry crystal growth density functional calculations polymorphism X‐ray diffraction |
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