Fig. 5

(Left) Electronic absorption spectra of SC 1 in Tris–HCl buffer (pH 7.40) upon incremental addition of CT-DNA, showing hyperchromism and a slight hypsochromic shift indicative of groove binding; (Right) Plot of the relative viscosity [(η/η₀)1/3)] versus the [SC 1]/[DNA] ratio, confirming the binding mode through minimal viscosity changes