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

•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.

Graphical abstractAn 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.Figure optionsDownload full-size imageDownload as PowerPoint slide