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Hosseini-Yazdi, Seyed A.
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article
Synthesis, crystal structures, spectroscopic and electrochemical studies on Cu(II) and Ni(II) complexes with compartmental nitrogen-oxygen mixed donor ligands
Abstract
<p>The synthesis and characterization of two new N<sub>2</sub>O<sub>4</sub> donor type ligands, 2-{[(2-{3-[2-({[(2-hydroxyphenyl)methylidene]amino}methyl) phenoxy]propoxy}benzyl)imino]methyl}phenol (H<sub>2</sub>L1) and 2-[({2-[3-(2-{[(2-hydroxybenzyl)amino]methyl}phenoxy)propoxy]benzyl}amino) methyl]phenol (H<sub>2</sub>L2), and their metal complexes with Cu(II) and Ni(II) metal ions are reported. The ligands and complexes have been characterized by <sup>1</sup>H NMR, FT-IR, UV-Vis absorption spectroscopy, single-crystal X-ray diffraction, CHN elemental analysis and cyclic voltammetry (CV). The redox behavior of the two complexes has been studied by CV. Copper and nickel complexes of Schiff base (H<sub>2</sub>L1) and reduced Schiff base (H<sub>2</sub>L2) showed different behaviors because the structure of the complexes depends of the ligand. The complex [Cu<sub>2</sub>L1 <sub>2</sub>]·2CH<sub>3</sub>OH (1) is dinuclear with the two metal centers bridged exclusively by the ligands, consisting of two distorted square planar CuN<sub>2</sub>O<sub>2</sub> chromophors with large intermetallic separation (8.879 Å). Complex [Ni<sub>4</sub>L2<sub>2</sub>(CH <sub>3</sub>COO)<sub>4</sub>]·4CH<sub>3</sub>OH (2) consists of tetranuclear Ni<sub>4</sub> unit of two symmetry related hexacoordinated nickel atoms having distorted octahedral NiN<sub>2</sub>O<sub>4</sub> and NiO <sub>6</sub> environments, and contains two types of acetate coordination modes, namely, bridging bidentate (μ<sub>2</sub>-η<sup>1</sup>, η<sup>1</sup>), and asymmetric chelating bridging (μ<sub>2</sub>- η<sup>2</sup>, η<sup>1</sup>).</p>