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- W2000604019 abstract "A very unusual triple structural transition pattern below room temperature was observed for the antifilarial drug diethylcarbamazine citrate. Besides the first thermal, crystallographic, and vibrational investigations of this first-line drug used in clinical treatment for lymphatic filariasis, a noteworthy behavior with three structural transformations as a function of temperature was demonstrated by differential scanning calorimetry, Raman spectroscopy, and single-crystal X-ray diffractometry. Our X-ray data on single crystals allow for a complete featuring and understanding of all transitions, since the four structures associated with the three solid−solid phase transformations were accurately determined. Two of three structural transitions show an order−disorder mechanism and temperature hysteresis with exothermic peaks at 224 K (T1′) and 213 K (T2′) upon cooling and endothermic ones at 248 K (T1) and 226 K (T2) upon heating. The other transition occurs at 108 K (T3) and it is temperature-rate sensitive. Molecular displacements onto the (010) plane and conformational changes of the diethylcarbamazine backbone as a consequence of the C−H···N hydrogen bonding formation/cleavage between drug molecules explain the mechanism of the transitions at T1′/T2. However, such changes are observed only on alternate columns of the drug intercalated by citrate chains, which leads to a doubling of the lattice period along the a axis of the 235 K structure with respect to the 150 and 293 K structures. At T2′/T1, these structural alterations occur in all columns of the drug. At T3, there is a rotation on the axis of the N−C bond between the carbamoyl moiety and an ethyl group of one crystallographically independent diethylcarbamazine molecule besides molecular shifts and other conformational alterations. The impact of this study is based on the fascinating finding in which the versatile capability of structural adaptation dependent on the thermal history was observed for a relatively simple organic salt, diethylcarbamazine citrate." @default.
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- W2000604019 date "2010-05-28" @default.
- W2000604019 modified "2023-10-03" @default.
- W2000604019 title "Triple Structural Transition below Room Temperature in the Antifilarial Drug Diethylcarbamazine Citrate" @default.
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- W2000604019 doi "https://doi.org/10.1021/cg100212q" @default.
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