A novel polymeric copper(II) compound containing peripheral nitro oxygen bridge and μ-OH core: An unprecedented tetradentate bonding mode of a potentially tridentate Schiff base

A copper(II) compound ([LCu(μ-OH)CuL(H2O)]ClO4)n (1) [where HL = 2-[(2-dimethylamino-ethylimino)-methyl]-4-nitro-phenol, is a well known Schiff base], has been synthesized and characterized by elemental analysis, IR and UV–Vis spectroscopy and single-crystal X-ray diffraction studies. The compound features a copper(II) polymeric coordination network composed of binuclear species [LCu(μ-OH)CuL(H2O)]+ as building blocks. It crystallizes in monoclinic space group P21/c with cell dimensions a = 22.1453(9), b = 7.8314(3), c = 18.5626(8) and β=108.509(3). The potentially tridentate Schiff base shows a tetra-dentate bonding mode for the 1st time.