Synthesis, structure and magnetic properties of heterometallic coordination polymers constructed from Cu (II)/Mn (II), H2bdc and H4btec

Three novel heterometallic coordination polymers [(CuLH2O)2MnCuL](ClO4)2 (1), [CuLMn(bdc0.5)2(H2O)] (2) and [CuLMn(btec)0.5EtOH] (3) have been synthesized using the mononuclear ligand CuL (H2L = 2,3-dioxo-5,6:13,14-dibenzo-7,10,12-trimethyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene; H2bdc = p-phthalic acid; H4btec = 1,2,4,5-benzenetetracarboxylic acid) as a precursor. Single-crystal X-ray diffraction reveals that the configuration of complexes 1–3 is tetranuclear compound with connectivity 0D, one-dimensional (1D) chain and two-dimensional (2D) layer, respectively. For complex 2, the adjacent 1D chains are interlinked mutually through the hydrogen bonds between the carboxylate groups of the H2bdc ligands and coordinated water molecules, extending the 1D chains into hydrogen-bonded 2D layers. Complex 3 exhibits a 2D sheet structure formed by the H4btec ligands. The magnetic studies of complex 1 show overall antiferromagnetic interactions between the Cu (II) and Mn (II) ions.