Cu(II) coordination polymers containing dicyanamide and 2,2’-bipyridine: structural and antibacterial properties

Abstract

From reaction mixture containing the same reagents, the two Cu(II) complexes, with dicyanamide (dca) bridges, [Cu(bpy)(dca)2]n (1) and [Cu(bpy)Cl(dca)]n.H2O (2) (bpy= 2,2’-bipyridine) were prepared. The complexes were characterized by elemental analysis, FT-IR spectroscopy and X-ray single crystal techniques. In both complexes, the geometry of the Cu(II) atom is best described as a slightly distorted square pyramidal. A zigzag chain structure is formed in both structures by dca units serving as an end-to end bridging ligand. In addition, studies on antibacterial activity of the compounds against Gram(+) (Staphylococcus aureus ATCC-6538) and Gram(-) (Escherichia coli ATTC-8739, Pseudomonas aeruginosa ATCC-27853 and Enterobacter aerogenes ATCC-13048) bacteria have been performed using disc-diffusion and microdilution broth techniques. Both complexes were found to be significantly more effective against Gram(-) bacteria E. Coli than against the other bacteria.