Poly[tetradecaaquatetrakis(μ3-imidazole-4,5-dicarboxylato)hexa-μ3-sulfato-cobalt(II)hexasamarium(III)]

Abstract

In the title three-dimensional compound, [CoSm6(C5H2N2O4)4(SO4)6(H2O)14]n, the CoII ion is six-coordinated with two O atoms and two N atoms from two imidazole-4,5-dicarboxylate ligands and two coordinated water molecules, giving a slightly distorted octahedral geometry. One SmIII ion is eight-coordinated in a bicapped trigonal–prismatic coordination geometry by four O atoms from two imidazole-4,5-dicarboxylate ligands, two O atoms from two SO42− anions and two coordinated water molecules. The other two SmIII ions are nine-coordinated in a tricapped trigonal–prismatic coordination geometry; one of these SmIII ions is bonded to four O atoms from two imidazole-4,5-dicarboxylate ligands, three O atoms from three SO42− anions and two water O atoms, and the other SmIII ion is coordinated by one O atom and one N atom from one imidazole-4,5-dicarboxylate ligand, five O atoms from three SO42− anions, as well as two coordinated water molecules. The crystal structure is further stabilized by N—H...O, O—H...O, and C—H...O hydrogen-bonding interactions.