三苯基硫鎓盐衍生物激光闪光光解的研究  

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

作　　者：戴光松[1] 吴世康[1] SchnabelW 

机构地区：[1]中国科学院感光化学研究所 [2]Hahn-MeitnerInstitutBerlinGmbH,D-14109Berlin,Germany

出　　处：《物理化学学报》1996年第1期54-58,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：The photochemical and photophysical behaviors of tri(4-tert-butoxycarbonyl oxyphenyl) sulphonium salts have been investigated. In argon-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 reac tion was observed. In the presence of poly-p-hydroxystyrene or diphenyl sulphide, the apparent second-order reaction decay rate constants were 107 and 108 L·mol-1 ’s-1 t re spectively. Results indicated that the transient absorption peak at 360nm was attributed to the diphenyl sulphide radicaJ cations formed in photolysis of sulphonium salts, which were proposed by abstraction of hydrogen from solvent or polymer to yield the protonic acid and diphenyl sulphide as listed in eqns. (1) and (2). The influence of non-nucleophilic anions of title compounds on their photochemical behavior was just less important.The photochemical and photophysical behaviors of tri(4-tert-butoxycarbonyl oxyphenyl) sulphonium salts have been investigated. In argon-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 reac tion was observed. In the presence of poly-p-hydroxystyrene or diphenyl sulphide, the apparent second-order reaction decay rate constants were 107 and 108 L·mol-1 's-1 t re spectively. Results indicated that the transient absorption peak at 360nm was attributed to the diphenyl sulphide radicaJ cations formed in photolysis of sulphonium salts, which were proposed by abstraction of hydrogen from solvent or polymer to yield the protonic acid and diphenyl sulphide as listed in eqns. (1) and (2). The influence of non-nucleophilic anions of title compounds on their photochemical behavior was just less important.

关 键 词：瞬态光谱 光引发剂 硫Wong盐 

分 类 号：O625.7[理学—有机化学] O644.18[理学—化学]