Research Article: Bis(1H-imidazole-κN3)bis­(2-oxidopyridinium-3-carboxyl­ato-κ2O2,O3)cobalt(II)

Date Published: August 01, 2009

Publisher: International Union of Crystallography

Author(s): Bing-Yu Zhang, Jing-Jing Nie, Duan-Jun Xu.


In the mol­ecule of the title CoII complex, [Co(C6H4NO3)2(C3H4N2)2], the CoII atom is located on a twofold rotation axis and chelated by two oxidopyridiniumcarboxyl­ate anions and further cis-coordinated by two imidazole ligands in a distorted octa­hedral geometry. The shorter C—O bond distance of 1.260 (2) Å suggests electron delocalization between the oxido group and the pyridinium ring. The uncoordinated carboxyl­ate O atom links with the imidazole and pyridinium rings of adjacent mol­ecules via N—H⋯O hydrogen bonding. Weak C—H⋯O hydrogen bonding is also present in the crystal structure.

Partial Text

For the isostructural NiII complex, see: Zhang et al. (2009 ▶). For the shorter C—O bond distance between the pyridine ring and the hydr­oxy-O atom in 2-oxidopyridinium-3-carboxyl­ate complexes and in 2-hydroxy­pyridine­carboxyl­ate complexes, see: Yao et al. (2004 ▶); Yan & Hu (2007a ▶,b ▶); Wen & Liu (2007 ▶); Quintal et al. (2002 ▶). For the corresponding C—O bond distances in 2-hydroxy­benzencarboxylic acid and in metal complexes of 2-hydroxy­benzencarboxyl­ate, see: Munshi & Guru Row (2006 ▶); Su & Xu (2005 ▶); Li et al. (2005 ▶).




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