DNA-Binding and Cleavage Studies of a Novel Two-dimensional Manganese(II) Azide Complex with N-Methylimidazole

A new complex, manganese(II) azide complex with N-methylimidazole, has been synthesized and characterized by elemental analysis, IR spectra and single crystal X-ray studies. Absorption spectroscopy, emission spectroscopy, viscosity measurements and CD spectroscopy have been used to investigate the binding of the complex with calf thymus DNA (CT-DNA). The intrinsic binding constant K-b of the complex with DNA was obtained by electronic absorption titration; the value is consistent with the result by fluorescence titration method. The spectroscopic studies together with viscosity measurements support the claim that the title complex bonds to CT-DNA by a groove mode. Control cleavage experiments using pBR 322 plasmid DNA which suggest minor groove binding for the complex.