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Citation: Dai Guang-Song, Wu Shi-Kang, Schnabel W. Laser Flash Photolysis of Tri(4-tert-butoxycarbonyloxyphenyl) Sulphonium Salts[J]. Acta Physico-Chimica Sinica, ;1996, 12(01): 54-58. doi: 10.3866/PKU.WHXB19960112 shu

Laser Flash Photolysis of Tri(4-tert-butoxycarbonyloxyphenyl) Sulphonium Salts

1.
Institute of Photographic Chemistry,Academia Sinica,Beijing 100101

Received Date: 24 March 1995
Available Online: 15 January 1996

The photochemical and photophysical behaviors of tri(4-tert-butoxycarbonyl oxyphenyl) sulphonium salts have been investigated. In ar n-satureted acetonitrile, the quantum yields of Bronsted acid formed during photolysis of these compounds was abount 0.5. In the transient absorption spectrum excited by 266nm in mathanol and dioxane an evident absorption peak at 360 nm decayed in accordance with pseudo-first-order reaction was observed. In the presence of poly-p-hydroxystyrene or diphenyl sulphide, the apparent second-order reaction decay rate constsnts were 107 and 108 L﹒mo-1﹒s-1, respectively. Results indicated that the transient absorption peak at 360nm was attributed to the diphenyl sulphide radical cations formed in photolysis of sulphonium salts, which were proposed by abstraction of hydrogen from solvent or polymer to yield the photonic acid and diphenyl sulphide as listed in eqns. (1) and (2). The influence of non-nuncleophilic anions of title compounds on their photochemical behavior was just less important.
- Transient absorption spectra,
- Photoinitiator,
- Sulfonium salt
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