Synthesis, crystal structure, thermal studies and antimicrobial activity of a new chelate complex of copper(II) succinate with N,N,N′,N′-tetramethylethylenediamine

A coordination polymer, [Cu(tmen)(succ)](n)center dot 4nH(2)O (1) (where succ(2-) = succinate dianion, tmen = N,N,N',N'-tetramethylethylenediamine), was prepared by reacting CuCl2 center dot 2H(2)O, succinic acid (H(2)succin) and tmen, and was characterized by elemental analysis, UV-visible spectroscopy, FTIR spectroscopy, thermogravimetric (TGA) and single-crystal X-ray diffraction analyses. The copper(II) ion in 1 has a distorted cis-CuN2O4 octahedral coordination environment in which the metal ion is bonded to a chelating tmen molecule and four O atoms from two bridging, asymmetrically chelating succ dianions. The bridging succ dianions link the copper(II) ions into [100] polymeric chains. In the crystal, all the H atoms of the water molecules of crystallization form O-H center dot center dot center dot O hydrogen bonds, which together with weak C-H center dot center dot center dot O hydrogen bonds results in a three-dimensional supramolecular network. The antibacterial activity of 1 was studied using the strains Bacillus spizizenii,Escherichia coli,Klebsiella pneumonia,Staphylococcus aureus, and antifungal activity was studied for Aspergillus niger. It showed significant activity against E. coli. [GRAPHICS]