Hexaaquacobalt(II) 3,3′-dicarboxybiphenyl-4,4′-dicarboxylate

Abstract

In the crystal structure of the title compound, [Co(H2O)6](C16H8O8), both the cation and anion are centrosymmetric. The Co cation displays a CoO6 octahedral geometry formed by six water molecules. In the anion, the two carboxyl groups are oriented at dihedral angles of 4.8 (5) and 10.4 (7)° with respect to the benzene ring. Very strong O—H...O hydrogen bonds between the protonated and deprotonated carboxylate groups occur. Neighbouring cations and anions are connected through O—H...O hydrogen bonds into a three-dimensional supramolecular structure.