On the photolysis of acylphosphine oxides: 1. Laser flash photolysis studies with 2,4,6-trimethylbenzoyldiphenylphosphine oxide
作者： T. Sumiyoshi , W. Schnabel , A. Henne , P. Lechtken
DOI: 10.1016/0032-3861(85)90069-2
关键词: Radical 、 Quantum yield 、 Styrene 、 Radical polymerization 、 Acrylonitrile 、 Photochemistry 、 Photodissociation 、 Chemistry 、 Flash photolysis 、 Singlet state
摘要: Abstract 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TMDPO) was irradiated in dilute solutions of benzene, methanol and dichloromethane with 20 ns flashes 347 nm light. By optical absorption measurements, a transient spectrum maximum at about 330 detected the end flash ascribed to diphenyl phosphonyl radical ( Ph ) 2 P =0 . This is formed by reaction. Evidence obtained for fragment radicals being formed, some extent least, from triplet states. Both singlet lifetimes were estimated as τ undergo self reaction (2k2≈5 × 109 l mol−1 s−1). Rather high rate constants (in s−1) found reactions oletinic compounds: 6.0 107 (styrene), (methyl methacrylate), 2.3 (methacrylate), 1.8 (acrylonitrile), 5.0 106 (t-butyl vinyl ether), 2.0 (vinyl acetate). The quantum yield formation o(-TMDPO) = 0.5 0.7. These results clearly show why TMDPO highly appropriate be applied an initiator photocuring coatings various compositions.
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