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The structural properties of a new copper (II) complex [Cu2(cip)2(bpy)2(pip)]Ã‚Â·6H2O (bpy=2,2Ã¢Â€Â™-bipyridyl, cip=1-cyclopropyl-6-4-oxo-1,4-dihydroquinoline-3-carboxylic acid, pip= piperazinyl anion), obtained during the synthesis of the copper complex with ciprofloxacin (cpf), has been investigated. The complex crystallizes in the triclinic system, space group P-1. The cell dimensions are: a=6.874(2) ÃƒÂ…, b= 10.761(3) ÃƒÂ…, c= 17.969(5) ÃƒÂ…, ÃŽÂ± =80.071(6)Ã‚Â°, ÃŽÂ²= 85.253(6)Ã‚Â°, ÃŽÂ³=79.109(6)Ã‚Â°Ã¯Â¼ÂŒV=1284.5(6) ÃƒÂ…3, and Z=2. The Cu (II) ion displays a five-coordinate square pyramidal coordination with two nitrogen donors from bpy, the 4-keto and 3-carboxylate oxygen donors of cip, and the third nitrogen atom of the pip anion occupying the fifth site. There is a stack effect between cip ring and bpy ring from another molecule, where the stacking distance is about 3.5 ÃƒÂ…. The results of elemental analysis and FT-IR measurement are also included. Both ligand and complex were assayed against gram-positive and gram-negative bacteria by the doubling dilutions method. The complex shows the same minimal inhibitory concentration (MIC) against S. Aureus and E. Coli bacteria as the corresponding ligand

Synthesis, Crystal Structure, Stacking Effect and Antibacterial Studies of a Novel Quaternary Copper (II) Complex with Quinolone