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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.

(E)-1-((pyridin-2-yl)methylidene)semicarbazide (PMSC) complexes of [Mn(PMSC)2 ]Cl2 (1), [Co(PMSC)2]Cl2 (2), [Ni(PMSC)2]Cl2.5H2O (3), and [Cu(PMSC)(H2O)]Cl2 (4) have been synthesized and characterized by different spectroscopic techniques, EPR, magnetic susceptibility and thermal stability measurements. Complex 3 crystallizes as octahedral coordination complex in monoclinic crystal system. Complexes 1 and 2 have been found to have octahedral geometries and 4 to have square planar geometry. The complexes were found to be groove binding to calf-thymus DNA.

Two new Schiff base transition metal complexes [Cu(HL)]2.CH3CH2OH (1) and [Ni(HL)] (2) (L = N,N′-bis(2-hydroxy-5-methyl-benzylidene)-2-hydroxy-propane-1,3-diamine) were synthesized and characterized by different physico-chemical and spectroscopic techniques. Structure of complex 1 was determined by single crystal X-ray diffractometer. Both the complexes have distorted square planar geometry. The DNA binding study of two complexes was performed via electronic absorption, cyclic voltammetry, photoluminescence, and viscosity methods and found to be intercalative mode of binding.