Quenching of Benzene Fluorescence by Oxygen
1970; American Institute of Physics; Volume: 52; Issue: 6 Linguagem: Inglês
10.1063/1.1673464
ISSN1520-9032
AutoresAkira Morikawa, R. J. Cvetanović,
Tópico(s)Porphyrin and Phthalocyanine Chemistry
ResumoMolecular oxygen has been found to quench benzene fluorescence without noticeably decreasing the concentration of the benzene triplet (3B1u) although the fluorescing species, the excited singlet B2u1, is the precursor of the triplet. The most obvious explanation of this apparent anomaly is that the B2u1 state is converted to the triplet B1u3 when it is quenched by O2, perhaps with simultaneous conversion of O2 to the first excited singlet (1Δg). The estimated values of the quenching rate constants of benzene singlet (1B2u) and benzene triplet (3B1u) by oxygen are, respectively, k2d = 2.1 × 10−10cc/molecule·sec and k3c = 2.1 × 10−11cc/molecule·sec.
Referência(s)