Polytetra­aqua­(μ4-imidazole-45-dicarboxyl­ato)(μ3-imidazole-45-dicarboxyl­ato)-μ3-sulfato-μ2-sulfato-cobalt(II)digadolinium(III) monohydrate

摘要

The asymmetric unit of the title compound, {[CoGd2(C5H2N2O4)2(SO4)2(H2O)4]·H2O}n, contains one Co^II ion, two Gd^III ions, two imidazole-4,5-dicarboxyl­ate ligands, two SO4 ²⁻ anions, four coordinated water mol­ecules and one uncoordinated water mol­ecule. The Co^II ion is six-coordinated by two O atoms from two coordinated water mol­ecules, as well as two O atoms and two N atoms from two imidazole-4,5-dicarboxyl­ate ligands, giving a slightly distorted octa­hedral geometry. Both Gd^III ions are eight-coordinated in a distorted bicapped trigonal–prismatic geometry. One Gd^III ion is coordinated by four O atoms from two imidazole-4,5-dicarboxyl­ate ligands, three O atoms from three SO4 ²⁻ anions and a water O atom; the other Gd^III ion is bonded to five O atoms from three imidazole-4,5-dicarboxyl­ate ligands, two O atoms from two SO4 ²⁻ anions as well as a water O atom. These metal coordination units are connected by bridging imidazole-4,5-dicarboxyl­ate and sulfate ligands, generating a heterometallic layer parallel to the ac plane. The layers are stacked along the b axis via N—H⋯O, O—H⋯O, and C—H⋯O hydrogen-bonding inter­actions, generating a three-dimensional framework.