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Polymorphism in cocrystals of urea:4,4 `-bipyridine and salicylic acid:4,4 `-bipyridine

Tothadi, Srinu (2014) Polymorphism in cocrystals of urea:4,4 `-bipyridine and salicylic acid:4,4 `-bipyridine. In: CRYSTENGCOMM, 16 (32). pp. 7587-7597.

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Official URL: http://dx.doi.org/ 10.1039/c4ce00866a


Polymorphic cocrystals of urea:4,4'-bipyridine and salicylic acid: 4,4'-bipyridine were obtained by crystallization from different solvents. The urea tape is a rare phenomenon in cocrystals but it is consistent in urea:4,4'-bipyridine polymorphic cocrystals. The polymorph obtained from MeCN has symmetrical N-H...N hydrogen bond distances on either side of the urea tape. However, the other form obtained from MeOH has unsymmetrical N-H...N hydrogen bond lengths. In the polymorphic cocrystals of salicylic acid:4,4'-bipyridine, the basic supramolecular synthon acid-pyridine is the same but the 3D packing is different. Both the polymorphic pairs of cocrystals come under the category of packing polymorphs. All polymorphs were characterized by single-crystal X-ray diffraction (SCXRD), PXRD, DSC, FT-IR and HSM. N-H...N and the acid-pyridine supramolecular synthons were insulated by FT-IR vibrational spectroscopy.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 18 Oct 2014 06:56
Last Modified: 18 Oct 2014 06:56
URI: http://eprints.iisc.ac.in/id/eprint/50042

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