Abstract
A new zinc(II) complex, [Zn(L)](ClO4) with hexadentate N4S2 donor azo-thioether ligand (HL) was synthesized and characterized by several spectroscopic techniques. The structure was confirmed by single crystal X-ray analysis. The interaction of the complex with CT DNA was investigated by UV–vis method and binding constant is found to be 6.6 × 104 M−1. Competitive binding titration with ethidium bromide (EB) by fluorescence titration method reveals that the complex efficiently displaces EB from EB-DNA system and the Stern-Volmer dynamic quenching constant, Ksv is found to be 2.6 × 104 M−1. DFT and TDDFT calculations were carried out to interpret the electronic structure and electronic spectra of the complex.
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