catena-Poly[[[diaquacadmium(II)]-bis[μ-3,5-bis(isonicotinamido)benzoato]] tetrahydrate]

Abstract

The title compound, {[Cd(C19H13N4O4)2(H2O)2]·4H2O}n or {[Cd(BBA)2(H2O)2]·4H2O}n, where BBA is 3,5-bis(isonicotinamido)benzoate, is isotypic with its Mn isologue [Chen et al. (2009). J. Coord. Chem. 62, 2421–2428]. The cation sits on a twofold axis and is six-coordinated in a slightly distorted octahedral geometry; the polyhedra are linked into zigzag chains, which are further connected by N—H...O, O—H...O and O—H...N hydrogen bonds as well as π–π interactions [centroid-centroid distance of 3.639 (2) Å], giving a three-dimensional supramolecular framework.