catena-Poly[[[diaquacobalt(II)]-[mu]-(3,5-dinitro-2-oxidobenzoato)-[kappa]3O1,O2:O1'-[tetraaquacobalt(II)]-[mu]-(3,5-dinitro-2-oxidobenzoato)-[kappa]3O1:O1',O2] dihydrate]

Abstract

In polymeric title compound, {[Co2(C7H2N2O7)2(H2O)6]孍 2H2O}n, obtained from the reaction of 3,5-dinitrosalicylic acid with cobalt(II) acetate, both CoII atoms are located on inversion centres and exhibit a distorted octahedral coordination geometry. The coordination sphere about one CoII atom comprises four O-atom donors from two bidentate chelate (Ophenolate and Ocarboxyl) and bridging dianionic ligands and two water molecules [Co-O range = 2.0249 (11)- 2.1386 (14) A ࠝ, while that about the second CoII atom has four water molecules and two bridging carboxylate O-donor atoms [Co-O range = 2.0690 (14)-2.1364 (11) A ࠝ. The coordinated water molecules as well as the water molecules of solvation give O-H啕O water-water and water-carboxyl hydrogen-bonding interactions in the three-dimensional framework structure.