Three coordination polymers based on M2 (M = Co, Ni and Zn) clusters: Structures, magnetic and fluorescent properties

Abstract

Three new coordination polymers, [M2(CDA)2(EG)2]n (M=Co (1), Ni (2) and Zn (3), H2CDA=1,1′-cyclopropane-dicarboxylic acid and EG=ethylene glycol), have been synthesized under solvothermal conditions and characterized via single-crystal X-ray diffraction, PXRD, EA, FT-IR, and TGA. Structural analysis indicates that metal ions form M2 clusters through μ2-O, which are further linked by CDA2− to generate 2D sheet structure with sql topology. The EG molecule functions not only as solvent but also as the chelate ligand. Magnetic measurements of complexes 1 and 2 have been carried out, which indicate the existence of metamagnetic behavior in complex 1 and antiferromagnetic interaction in complex 2. Furthermore, the fluorescence property of complex 3 was investigated.