New Copper(II) Complexes of Pyridine-2-carboxaldehyde-N-(2-pyridyl)hydrazone and 2-Hydroxy-1-naphthaldehyde-semicarbazone: Synthesis, Characterization, DNA Binding and Antimicrobial Activity Studies

Abstract

Two new copper(II) complexes of pyridine-2-carboxaldehyde-N-(2-pyridyl)hydrazone [Cu(PCPH)(H2O)2](NO3)(H2O)2 (1) and 2-hydroxy-1-naphthaldehyde-semicarbazone [Cu(II)(HNSC)H2O]·NO3·H2O (2) have been synthesized and characterized by spectroscopic techniques and single crystal X-ray diffraction study. Complex 1 crystallized as square pyramidal coordination complex in triclinic crystal system while complex 2 crystallized as square planar complex in monoclinic crystal system. EPR spectral patterns are of normal order of energy levels, i.e. x2-y2 >> z2 > xy > xz, yz, with partial covalent character. Both copper(II) complexes were found to be groove binding to calf-thymus DNA and showed activity against E. coli, S. aureus, B. cereus and E. faccium.