Synthesis and Biological Screening of New 4-Hydroxycoumarin Derivatives and Their Palladium(II) Complexes

Figure 1

EPR spectra of DEPMPO/OH spin-adduct upon addition of 5 μM C1 and C2 (a) and DEPMPO-^•OOH adduct upon addition of 20 μM C2 (b). The antioxidant activity is calculated relative to the heights of the peaks marked with open circles; ABTS quenching activity of C1, L1, C2, and L2. Concentrations tested are given in brackets (c).

(a)

(b)

(c)