A [Cu3] Cluster-Based Chain Featuring Linkages of Acylhydrazone N–N Single Bonds and Cl− Ions: Synthesis, Structure and Magnetic Properties

A Cu coordiantion polymer, namely, [Cu 3 (ovph)(Py) 2 Cl 2 ] ( 1 ) [H 4 ovph = N , N ′-bis( o -vanillidene)pyridine-2,6-dicarbohydrazide]; Py = Pyridine], was synthesized by solvothermal reaction of copper acetate and diacylhydrazone ligand H 4 ovhp. It was characterized by element analysis, FT-IR, thermogravimetric analysis, PXRD and single crystal X-ray diffraction. Structural analysis indicated that the N–N bonds of its ovph 4− ligands bridge the Cu 2+ ions to form quasi-linear [Cu 3 ] cluster-based units, which were further linked together by in situ generated µ-Cl − , giving rise to a rare Cu chain structure containing two kinds of magnetic exchange pathways. Variable temperature magnetic measurements revealed that both N–N and Cl − bridges convey antiferromagnetic couplings, with the best fitting J N–N = − 99.95 cm −1 , J Cl = − 5.70 cm −1 , zj = − 1.17 cm −1 and g = 2.00.