Magnetic, spectroscopic, structural and biological properties of mixed-ligand complexes of copper(II) with N,N,N′,N″,N″-pentamethyldiethylenetriamine and polypyridine ligands

Two new mixed ligand complexes of copper(II) with N,N,N′,N″,N″-pentamethyldiethylenetriamine and polypyridine ligands have been prepared and characterized by means of spectroscopic, magnetic and single-crystal X-ray diffraction methods. These two complexes are isomorph and isostructure in which the coordination polyhedron about the copper(II) ion is distorted square pyramidal. [Cu(PMDT)(bipy)]2+ and [Cu(PMDT)(phen)]2+ show an absorption wavelength maximum at 625 and 678 nm, respectively, assigned to the d–d transition. Antibacterial, antifungal and superoxide dismutase activities of these complexes have also been measured. It was observed that [Cu(PMDT)(bipy)](ClO4)2 was more effective against P. Pyocyanea and Klebsiella sp. than S. aureus. Similarly, Fusarium sp. was highly susceptible against [Cu(PMDT)(bipy)](ClO4)2 but less susceptible against [Cu(PMDT)(phen)](ClO4)2.