Synthesis, structure, redox properties and DNA interaction studies on mononuclear iron(III) complexes with amidate ligand
摘要:
A new family of mononuclear Fe(III) complexes [Fe(Pamp)(MeOH) Cl-2], 1 and [Fe(Pamp)(2)](ClO4), 2 were synthesized using designed tridentate ligand PampH having pyridine and amide nitrogen donors (PampH is NO-phenyl-NO-(pyridin-2-yl) picolinohydrazide) and H stands for dissociable proton). Both the complexes (1 and 2) were characterized by different spectroscopic studies and molecular structure of [Fe(Pamp)(2)](ClO4), 2 was determined by single crystal X-ray diffraction. Geometry around metal centre was described as distorted octahedral with two meridionally oriented Pamp ligands. Electrochemical studies afforded E1/2 values of Fe(III)/Fe(II) couple + 0.065 V (for 1) and 0.077 V (for 2) versus Ag/AgCl electrode. DNA binding properties of these complexes were investigated and complex 1 exhibited nuclease activity. Mechanistic investigation revealed the possible participation of hydroxyl radical in nuclease activity which was supported by rhodamine B assay. (C) 2013 Elsevier B. V. All rights reserved.