An unexpected Schiff base-type Ni(II) complex: Synthesis, crystal structures, fluorescence, electrochemical property and SOD-like activities

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 137; pp. 661 - 669
• Main Authors: Chai, Lan-Qin, Zhang, Hong-Song, Huang, Jiao-Jiao, Zhang, Yu-Li
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 25.02.2015
• Subjects: Crystal structures; Crystallization; Crystallography, X-Ray; Cyclic voltammetry; Electrochemistry; Hydrogen Bonding; Ligands; Magnetic Resonance Spectroscopy; Metals - chemistry; Molecular Conformation; Nickel - chemistry; Oxidation-Reduction; Quinazoline-type ligand; Schiff base-type complex; Schiff Bases - chemistry; Spectrometry, Fluorescence; Spectrophotometry, Ultraviolet; Spectroscopic properties; Spectroscopy, Fourier Transform Infrared; Superoxide Dismutase - chemistry; Superoxide dismutase activities; Cyclic voltammetry; Spectroscopic properties; Crystal structures; Schiff base-type complex; Quinazoline-type ligand; Superoxide dismutase activities
• ISSN: 1386-1425; 1873-3557
• DOI: 10.1016/j.saa.2014.08.084

An unexpected Schiff base-type Ni(II) complex instead of an anticipated quinazoline-type complex has been synthesized and structural characterized by spectroscopic methods. Crystal structures of the ligand and complex have been determined by single-crystal X-ray diffraction. Moreover, the electrochemical property of the nickle complex was studied by cyclic voltammetry. In addition, SOD-like activities of HL1 and Ni(II) complex were also investigated. [Display omitted] •A new quinazoline ligand has been synthesized firstly.•An Schiff base-type Ni(II) complex has been synthesized and structural characterized.•Crystal structures have been determined by single-crystal X-ray diffraction.•Some new results are very important to coordination and supramolecular chemistry. An unexpected Schiff base-type Ni(II) complex, [Ni(L2)2]⋅CH3OH (HL2=1-(2-{[(E)-3, 5-dibromo-2-hydroxybenzylidene]amino}phenyl)ethanone oxime), has been synthesized via complexation of Ni(II) acetate tetrahydrate with HL1 (2-(3,5-dibromo-2-hydroxyphenyl)-4-methyl-1,2-dihydroquinazoline 3-oxide) originally. HL1 and its corresponding Ni(II) complex were characterized by IR, 1H NMR spectra, as well as by elemental analysis, UV–Vis and emission spectroscopy, respectively. Crystal structures of the ligand and complex have been determined by single-crystal X-ray diffraction. Each complex links two other molecules into an infinite 1-D chain via intermolecular hydrogen bonding interactions. Moreover, the electrochemical property of the nickle complex was studied by cyclic voltammetry. In addition, SOD-like activities of HL1 and Ni(II) complex were also investigated.