Abstract
The quenching rate constants of excited singlet (k(S)(O2)) and triplet (k(T)(O2)) states by oxygen were investigated in the vapor phase for polycyclic aromatic hydrocarbons having distinguishing oxidation potentials E(ox). The significant spread in the rate constants was found (4x10(5)s(-1)Torr(-1)<k(S)(O2)<1.2x10(7)s(-1)Torr(-1); 5x10(2)<k(T)(O2)<4x10(5)s(-1)Torr(-1)). The values of both k(S)(O2) and k(T)(O2) change linearly in the logarithmic scale with free energy change for complete electron transfer DeltaG(ET), which points that the charge-transfer interactions are involved in the oxygen quenching of the S(1) and T(1) states.
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