Add time:08/24/2019         Source:sciencedirect.com

Three new compounds of copper(II) viz. [Cu(BQCNH2)(CH3CN)](ClO4)2∙CH3CN 1, [Cu(BQCNH2)(bpy)](ClO4)2 2 and [Cu(BQCNH2)(phen)](ClO4)2∙2H2O 3 (BQCNH2 = N,N′-di(quinolin-8-yl)cyclohexane-1,2-diamine, bpy = 2,2′-bipyridine and phen = 1,10-phenanthroline) were synthesized and characterized by IR, UV-Vis, ESI-MS, EPR spectroscopy, cyclic voltammetry, magnetic and thermogravimetric analyses and X-ray diffraction. Thermal studies reveal loss of two molecules of CH3CN and water respectively for 1 and 3. Both 2 and 3 crystallize in the centrosymmetric monoclinic space group P21/n and the central metal exhibits a distorted octahedral geometry. The bidentate ligands (bpy in 2 and phen in 3) occupy cis positions of the {CuN6} octahedron while the tetradentate BQCNH2 ligand spans the remaining vertices of the octahedron. The perchlorate anions and the hexacoordinate Cu(II) species in 2 and 3 are interlinked with the aid of several N-H∙∙∙O, C-H∙∙∙O interactions. In compound 3, OH∙∙∙O interactions due to lattice water are additionally observed. Density functional theory (DFT) reveals a trigonal bipyramidal geometry for 1. Antimicrobial properties of 1-3 against two bacterial pathogens viz. E. coli and S. aureus were investigated. Compound 3 exhibits better activity as compared to 1 and 2.

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