Poly[[tetraaquabis(μ3-1H-imidazole-4,5-dicarboxylato)tetrakis(μ2-1H-imidazole-4,5-dicarboxylato)tricobalt(II)diytterbium(III)] dihydrate]

Abstract

The asymmetric unit of the title compound, {[Co3Yb2(C5H2N2O4)6(H2O)4]·2H2O}n, contains one YbIII ion, two CoII ions (one situated on an inversion centre), three imidazole-4,5-dicarboxylate ligands, two coordinated water molecules and one uncoordinated water molecule. The YbIII ion is seven-coordinated, in a monocapped trigonal prismatic coordination geometry, by six O atoms from three imidazole-4,5-dicarboxylate ligands and one water O atom. Both CoII ions are six-coordinated in a slightly distorted octahedral geometry. The CoII ion that is located on an inversion center is coordinated by two O atoms from two water molecules, as well as two O atoms and two N atoms from two imidazole-4,5-dicarboxylate ligands. The second CoII ion is bonded to four O atoms and two N atoms from four imidazole-4,5-dicarboxylate ligands. These metal coordination units are connected by bridging imidazole-4,5-dicarboxylate ligands, generating a three-dimensional network. The crystal structure is further stabilized by N—H...O, O—H...O and C—H...O hydrogen-bonding interactions involving the water molecules and the imidazole-4,5-dicarboxylate ligands.