Figure 1: absorption spectral of the complexes 1 (a), 2 (b) and 3 (c) in Tris-HCl buffer A upon increasing amounts of CT-DNA. [V] = 20 μM, [DNA] = (0-100) μM. Arrow shows the decreasing absorbance upon increasing CT-DNA concentrations. Insert: Plots of [DNA]/(εa-εf) versus [DNA] for the titration of [V] with CT-DNA.