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

Abstract

A coordination polymer, [Cu(tmen)(succ)]_n·4nH₂O (1) (where succ^2- = succinate dianion, tmen = N,N,N′,N′-tetramethylethylenediamine), was prepared by reacting CuCl₂·2H₂O, succinic acid (H₂succin) 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···O hydrogen bonds, which together with weak C–H…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.

Keywords:

• Copper(II) carboxylates
• N,N,N′,N′-tetramethylethylenediamine
• coordination polymer
• succinic acid
• succinate

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors would like to gratefully acknowledge the financial support from Higher Education Commission Islamabad, Pakistan for this investigation.