Syntheses, crystal structures and antimicrobial activities of polynuclear CoII, NiII and ZnII complexes derived from the N,N'-bis(4-fluorosalicylidene)-1,3-propanediamine Schiff base

Abstract

A series of new cobalt(II), nickel(II) and zinc(II) complexes [Co{CoL(CH3COO)}2] (1), [Ni{NiL(CH3COO)}2] (2), [Zn{ZnL(CH3COO)}2] (3), [Ni2ClL(μ2-1,5-dca)]n (4), [Zn2BrL(μ1,1-N3)]2 (5), [Zn2ClL(μ1,1-N3)]2 (6), where L is the doubly deprotonated form of N,N'-bis(4-fluorosalicylidene)-1,3-propanediamine (H2L), dca is dicyanoamide, were synthesized and characterized by elemental analyses, infrared and electronic spectroscopy, and single crystal X-ray determination. Complexes 1, 2 and 3 are isostructural acetato- and phenolato-bridged trinuclear compounds. Complex 4 is a μ2-1,5-dca and phenolato-bridged polymeric compound. Complexes 5 and 6 are isostructural end-on azido- and phenolato-bridged tetranuclear compounds. The compounds were evaluated for their antibacterial (Bacillus subtilis, Staphylococcus aureus, Escherichia coli, and Pseudomonas fluorescens) and antifungal (Candida albicans and Aspergillus niger) activities by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method.