Two mono- and dinuclear Ni(II) complexes constructed from quinazoline-type ligands: Synthesis, X-ray structures, spectroscopic, electrochemical, thermal, and antimicrobial studies

Two mono- and dinuclear Ni(II) complexes, [Ni(L-3)(2)]center dot 2H(2)O (1) (HL3 = 1-(2-{[(E)-3-methoxy-2-hydroxy-benzylidene]amino}phenyl)ethanone oxime) and [Ni-2(L-4)(2)(CH3COO)(2)] (2) (HL4 = 1-(2{[(E)-2-hydroxy-benzylidene]amino}phenyl)ethanone oxime), have been synthesized via complexation of Ni(II) acetate tetrahydrate with HL1 and HL2 (HL1 = 2-(2-hydroxy-3-methoxyphenyl)-4-methyl-1,2-dihydroquinazo-line 3-oxide, HL2 = 2-(2-hydroxyphenyI)-4-methyl-1,2-dihydroquinazoline 3-oxide) originally. HL1, HL2, and two Ni(II) complexes were characterized by IR, UV-Vis, and fluorescence spectroscopy, as well as by elemental analysis, respectively. The spectroscopic data of two Ni(II) complexes were compared with the ligands HL1 and HL2. The differently geometric features of the obtained complexes 1 and 2 are observed by X-ray crystallography. In the crystal structure, complexes 1 and 2 form an infinite 1-D chain and 2 into 2-D supramolecular frameworks. The electrochemical properties of 1 and 2 were also investigated by cyclic voltammetry. Moreover, thermal property of 1 was also studied. In addition, the antimicrobial activity of HL1, HL2, and complexes 1 and 2 were also investigated. (C) 2017 Elsevier Ltd. All rights reserved.