Poly[μ-aqua-diaqua(μ3-1H-benzimidazole-5-carboxylato-κ3N3:O,O′)(μ2-1H-benzimidazole-5-carboxylato-κ3N3:O:O′)-μ5-sulfato-μ4-sulfato-tricadmium]

Abstract

The asymmetric unit of the title compound, [Cd3(C8H5N2O2)2(SO4)2(H2O)3]n, contains three CdII ions, two sulfate anions, two 1H-benzimidazole-5-carboxylate (H2bic) ligands and three coordinated water molecules. One CdII ion is six-coordinated and exhibits a distorted octahedral geometry, while the other two CdII ions are seven-coordinated, displaying a distorted pentagonal–bipyramidal geometry. The CdII ions are bridged by two types of sulfate anions, producing inorganic chains along [100]. These chains are further connected by the H2bic ligands, leading to a three-dimensional framework. N—H...O and O—H...O hydrogen bonds and π–π interactions between the imidazole and benzene rings [centroid–centroid distances = 3.953 (2), 3.507 (2), 3.407 (2) and 3.561 (2) Å] further stabilize the crystal structure.