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.