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Polymorphism in hydrazonium salt of 3,5-pyrazoledicarboxylic acid

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Title Polymorphism in hydrazonium salt of 3,5-pyrazoledicarboxylic acid
 
Creator Kumar, V S Senthil
Premkumar, T
Rath, Nigam P
 
Subject Hydrazonium salt
3,5-pyrazoledicarboxylic acid
polymorphism
crystal structure
hydrogen bonding
 
Description 141-147
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.
 
Date 2008-03-18T11:00:55Z
2008-03-18T11:00:55Z
2007-01
 
Type Article
 
Identifier 0376-4699
http://hdl.handle.net/123456789/400
 
Language en_US
 
Relation Int.Cl.⁸ C07D
 
Publisher CSIR
 
Source IJC-B 46B(1) January 2007