Abstract
Rate constants of quenching, kq, and hydrogen abstraction, ka, of benzophenone triplet with oligostyrenes from dimer to hexamer as well as with cumene were determined in acetonitrile at 30°C from transient phosphorescence decay and quantum yield for benzophenone reduction measurements. The values of kq=(4.0±1.0)×106 unit-M−1s−1 and ka=(1.3±0.3)×105 unit-M−1s−1 for oligostyrenes are independent of the number of monomer unit, n. The kq for oligostyrene is three times larger than kq for cumene, its monomer model, supposingly due to a sandwich-type encounter of benzophenone with two adjacent phenyl groups, but ka for oligostyrene is equal to ka for cumene. The chemical reaction (hydrogen abstraction) contributes in only 3.5% to total deactivation of benzophenone triplet by oligostyrenes.
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Horie, K., Takagi, T., Mita, I. et al. Rates of Quenching and Hydrogen Abstraction of Benzophenone Triplet with Cumene and Oligostyrenes. Polym J 16, 887–893 (1984). https://doi.org/10.1295/polymj.16.887
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DOI: https://doi.org/10.1295/polymj.16.887
