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Absorption spectra of 40 μM of (a) isoquinoline (4p(A),4 l(B) and 4i(C)) and (b) 4–quinolone derivatives (3a(A),2b(B) and5a(C)) in absence and presence of increasing concentration of DNA (indicated with arrow). The graph within the figure is the plot of A°/ (A–A°) vs 1/[DNA] plot for the determination of Gibb’s free energy as well as the binding constant for the tested derivatives
