Fig. 6. UV absorption spectra of the competitive reaction between compound 7a and NR with DNA. c(DNA) = 4.20 × 10–5 mol L–1, c(NR) = 2 × 10–5 mol L–1, and c(compound 7a) = 0–2.0 × 10–5 mol L–1 for curves a–i, respectively, at 0.25 × 10–5 mol L–1 increments. (Inset) Absorption spectra with the increasing concentration of 7a in the wavelength range of 400–550 nm of the competitive reaction between compound 7a and NR with DNA.
