Syntheses and characterization of two metal–water clusters

Complexes 1 and 2, formulated {[Co2(4,4′-bpy)2 · 8H2O] · (CCA)2 · 4H2O}n (1) and {[Co(TMG)(4,4′-bpy)(H2O)2] · 3H2O}n (2) (H2CCA = 2-carboxylatocinnamate, H2TMG = 3,3-tetramethyleneglutate, 4,4′-bpy = 4,4′-bpyridine) have been synthesized by the reaction of cobalt (II), 4,4′-bpy and carboxylate ligands, in which 2D metal–water layers and 1D metal–water chains have been observed, respectively. In the metal–water clusters, the water molecules are trapped by the cooperative association of coordination interactions as well as hydrogen bonds.