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Anion and solvent effects on the coordination behavior of N-(2-pyridinylmethylene)benzoylhydrazone with copper(II): synthesis and structural characterization

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The Cu(II) complexes [Cu(HL)Cl2], 1; [Cu(HL)(NO3)(H2O)]NO3, 2a; [Cu(L)(NO3)]2·C3H8O, 2b; [Cu(L)(μ 1,1–N3)]2, 3; [Cu(L)(Br)]2, 4; [(H2O)CuL(μ-SO4)CuL], 5a; [CuL(μ-SO4)CuL]·H2O, 5b and [Cu(L)(CH3COO)]2, 6, where HL is a benzoylhydrazone tridentate Schiff base, have been synthesized and characterized by elemental analysis, FTIR, and UV–vis. The structures of 2a, 2b, 3, 4, 5a , and 5b have been determined by single-crystal X-ray diffraction analyses. In 2a , the benzoylhydrazone ligand is neutral and coordinates in its keto form and copper(II) has a distorted octahedral geometry. In dinuclear 2b, 3, 4, 5a , and 5b , there are bridging counter anions and the benzoylhydrazone ligand is monoanionic, coordinating in its enol form. In 5a and 5b , the enolic ligand also supplies a bridging alkoxo to the adjacent copper ion. In 5a, one of the two copper ions is five-coordinate in a distorted square pyramidal geometry, while the other copper ion has an additional water bonded to it in a distorted octahedral geometry. In 5b, both copper ions are five-coordinate with distorted square pyramidal geometries.
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Keywords: Benzoylhydrazone; Bridge; Copper complex; Counter anion; Enol form; Keto form

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Yazd University, Yazd, Iran 2: Research School of Chemistry, Australian National University, Canberra, Australia

Publication date: December 17, 2015

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