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Bis-(3,5-diamino-4H-1,2,4-triazol-1-ium) 3,4-dioxocyclo-butane-1,2-diolate.

ABSTRACT: The asymmetric unit of the title compound, 2C2H6N5(+)·C4O4(2-), contains two 3,5-diamino-4H-1,2,4-triazolium cations and one squarate dianion. The squaric acid mol-ecule donated one H atom to each of the two 3,5-diamino-1,2,4-triazole mol-ecules at their N atoms. The squaric acid dianion has four C-O bonds which are shorter than a normal single C-O bond (1.426?Å) and are slightly longer than a normal C=O bond (1.23?Å), which indicates the degree of electron delocalization in the dianion. In the crystal, the cations and dianions are linked by N-H?N and N-H?O hydrogen bonds into a three-dimensional network.

SUBMITTER: Fun HK 

PROVIDER: S-EPMC3588514 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature

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Bis-(3,5-diamino-4H-1,2,4-triazol-1-ium) 3,4-dioxocyclo-butane-1,2-diolate.

Fun Hoong-Kun HK   Loh Wan-Sin WS   Johnson Atim A   Yousuf Sammer S   Eno Ededet E  

Acta crystallographica. Section E, Structure reports online 20130206 Pt 3

The asymmetric unit of the title compound, 2C2H6N5(+)·C4O4(2-), contains two 3,5-diamino-4H-1,2,4-triazolium cations and one squarate dianion. The squaric acid mol-ecule donated one H atom to each of the two 3,5-diamino-1,2,4-triazole mol-ecules at their N atoms. The squaric acid dianion has four C-O bonds which are shorter than a normal single C-O bond (1.426 Å) and are slightly longer than a normal C=O bond (1.23 Å), which indicates the degree of electron delocalization in the dianion. In the  ...[more]

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