A novel two-dimensional 4f-3d coordination polymer Ce2Co3(EDTA)3(H2O)11·12H2O

Abstract

A novel two-dimensional 4f-3d heterometallic coordination polymer Ce2Co3(EDTA)3(H2O)11·12H2O (EDTA = ethylenediamine-N,N,N′,N′-tetraacetate) has been synthesized using complex Na[Ce(EDTA)] as ligand. The complex crystallines in the space group C2, with lattice parameters a = 15.974(3) A, b = 14.676(3) A, c = 14.773(3) A, β = 116.39(3)°,V = 3102.4(11) A3, Dx = 1.858 g/m3, Z = 2. It consists of a two-dimensional sheet in which the Ce(III) is ten-coordinated by six carboxylic O atoms from three EDTA molecules and four O atoms of water molecules, forming a distorted bicapped square antiprism, and the Co(II) atom is seven-coordinated by two N, four O atoms from one EDTA molecule and one O atom from the water molecule, giving rise to a monocapped trigonal prism. Each chelated Co(II) atom is connected to two hydrated Ce(III) atoms through tridendate bridging carboxylate groups, while each Ce(III) atom has three Co(II) atoms as neighbors. These sheets are linked into a three-dimensional network by the water molecules between layers through rich hydrogen bonds.