Fig. 8

Absorption spectra of 1.00 × 10–4 M (A) PCHD, (B) [Cu(PCHD)2]ClO4.H2O, (C) PyCHD, and (D) [Cu(PyCHD)2]ClO4.H2O in DMSO solution in the absence and presence of (0–80) µL wheat DNA, and a plot of \(\frac{[\mathrm{DNA}]}{(\mathrm{\varepsilon a}-\mathrm{\varepsilon f})}\) vs. [DNA] for the calculation of the intrinsic binding constant, Kb