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IJC-B Vol.46B(01) [January 2007] >


Title: Polymorphism in hydrazonium salt of 3,5-pyrazoledicarboxylic acid
Authors: Kumar, V S Senthil
Premkumar, T
Rath, Nigam P
Keywords: Hydrazonium salt
3,5-pyrazoledicarboxylic acid
polymorphism
crystal structure
hydrogen bonding
Issue Date: Jan-2007
Publisher: CSIR
IPC CodeInt.Cl.⁸ C07D
Abstract: Two polymorphic structures of hydrazonium monobasic salts of 3,5-pyrazoledicarboxylic acid are described. In both instances, one-dimensional infinite chains formed by acid molecules through O–H∙∙∙O hydrogen bonding (1.68 Å,177.1º;1.71Å 169º) are inter-linked by hydrazonium dications to form two-dimensional sheets. The subtle structural difference between the two forms arises in the packing of hydrazonium dications. In form A, the hydrazonium dications are relatively close packed compared to those in form B. The closest N…..N distance between two hydrazonium dications of inversion related layers in form A is 2.03 Å whereas the closest N…..N distance between two similar hydrazonium dications (disordered) is 4.89 Å for form B. This account for the higher packing fraction (78﹪ vs 76.2﹪) of form A compared to form B.
Page(s): 141-147
ISSN: 0376-4699
Source:IJC-B Vol.46B(01) [January 2007]

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