Fig. 8. Emission spectra of HSA with various concentrations of compound 7a. c(HSA) = 1.0 × 10^–5 mol L^–1; c(compound 7a)/(10^–5 mol L^–1), a–h: from 0.0 to 1.17 at increments of 0.167; blue and red lines are the emission spectrum of compound 7a only and HSA only, respectively; T = 298 K, λ_ex = 295 nm.