Distorted square-antiprism geometry of new zirconium (IV) Schiff base complexes: Synthesis, spectral characterization, crystal structure and investigation of biological properties

A series of zirconium (IV) Schiff-base complexes formulated as [Zr (L-x)(2)] and [Zr (L-x')(2)] were Synthesized by reaction of tetradentate salicylaldimine Schiff -base ligands with [Zr (acac)(4)] in methanol. These ligands are as follows: H2L(x) and H2L(x)' (x = x' = 1,2,3,4). The new complexes have been characterized using FT-IR,H-1 NMR,C-13(H-1) NMR spectroscopic techniques, elemental analyses (CHN) and the crystal structure of Zr (L-3)(2), Zr (L-1')(2) and Zr (L-3')(2) were determined by X-ray crystallography. The crystal structure analysis revealed that the coordination environment of the metal in all complexes is eight-coordinate occupied by N2O2 sets of the coordinated ligands in distorted square-antiprism geometry. The in vitro biological screening effects of the synthesized compounds were tested against different microbial kinds and the zirconium (IV) complexes exhibit antimicrobial activity. (C) 2017 Elsevier B.V. All rights reserved.