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- W2032130138 abstract "Structural changes in the high-temperature ∊-polymorph of chlorpropamide, 4-chloro- N -(propylaminocarbonyl)benzenesulfonamide, C 10 H 13 ClN 2 O 3 S, on cooling down to 100 K and on reverse heating were followed by single-crystal X-ray diffraction. At temperatures below 200 K the phase transition into a new polymorph (termed the ∊′-form) has been observed for the first time. The polymorphic transition preserves the space group Pna 2 1 , is reversible and is accompanied by discontinuous changes in the cell volume and parameters, resulting from changes in molecular conformation. As shown by IR spectroscopy and X-ray powder diffraction, the phase transition in a powder sample is inhomogeneous throughout the bulk, and the two phases co-exist in a wide temperature range. The cell parameters and the molecular conformation in the new polymorph are close to those in the previously known α-polymorph, but the packing of the z-shaped molecular ribbons linked by hydrogen bonds inherits that of the ∊-form and is different from the packing in the α-polymorph. A structural study of the α-polymorph in the same temperature range has revealed no phase transitions." @default.
- W2032130138 created "2016-06-24" @default.
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- W2032130138 date "2009-10-27" @default.
- W2032130138 modified "2023-10-11" @default.
- W2032130138 title "A conformational polymorphic transition in the high-temperature ∊-form of chlorpropamide on cooling: a new ∊′-form" @default.
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- W2032130138 doi "https://doi.org/10.1107/s010876810903290x" @default.
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