Synthesis, crystal structures, and magnetic properties of new tetranuclear Cu(II)complexes of bis-bidentate Schiff-base ligands

摘要

Two tetranuclear copper(II) complexes with long rigid Schiff-base ligands [Cu4(bmsbd)2]-2DMF[H2bmsbd = N,N'-bis-(3-methoxy-salicylidene)benzene-1,4-diamine] (1) and [Cu4(besbd)21.DMF-5H20[H2besbd = N,N'-bis-(3-methoxy-salicylidene)benzene-1,4-diamine] (2) have been synthesised and char-acterized. Single X-ray diffraction analysis reveals that both complexes exhibit interesting [2 x 2] molec-ular grid-like configuration assembled by four organic ligands in a head-to-tail mode to bind fourcopper(II) ions. Magnetic property investigations reveal weak antiferromagnetic interaction via a-bondpathway of long rigid Schiff-base ligand between the neighboring copper(II) ions in both complexes.