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ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, vol.61, 2005 (SCI-Expanded)
The title polymeric compound, {[Co(C4O4)(C6H6N2O)(2)-(H2O)(2)].2H(2)O}(n), has two crystallographically independent half-molecules in the asymmetric unit, each Co atom residing on a center of symmetry. The two polymeric chains exhibit similar coordination geometry but display differences with regard to other structural features. Each Co-II center is octahedrally coordinated by two mutually trans pyridine-4-carboxamide ( or isonicotinamide) ligands, two mutually trans squarate ligands and two trans aqua ligands. The crystal structure contains chains of squarate-1,3-bridged Co-II ions. These chains are held together by N - H........O and O - H........O intermolecular hydrogen-bond interactions, forming an extensive three-dimensional network.