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Fluorescence quenching of the diphenyl ketyl radical

✍ Scribed by H. Bauman; K.P. Schumacher; H.J. Timpe; V. Řehák

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
380 KB
Volume
89
Category
Article
ISSN
0009-2614

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✦ Synopsis

E\crIatron of a-phr'nylbenzom solutron in accronitrde generates cmissron from thu drphcnyl hclyl radrcll with a Lfctimc oi 3.7 ns Thus IS quenched by methyl methaayhrc andp-chlorobcnzcncdiazonium tctrafluorobontc.

The rate constant with dazomum salt is about the umc for Found and exncd radrals, whrlu rcaclion of rhc c~rcd rsdlal WIG methyl mcrhscryhte is 3 x IO' rimes fasccr than ior rhc ground state.

📜 SIMILAR VOLUMES

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IViJitrogcn laser excitation of benzophenone solutions in some hydrogencontaining solvents generates emission from the diphenyl ketyI radical. In relatively unreactive solvents, a kety1 radical (produced by a benzophenone triplet) accepts energy fmm another benzophenone triplet; in highly reactive s

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Fluorescence spectra and lifetimes have been measured at 77 K for the chalcone ketyl radical anion, and its hydroxy and methoxy derivatives. The radical anions were produced by y-irradiation of sample molecules at 77 K in alkaline polyvinyl alcohol films and in EPA rigid glasses with set-butylamine,

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The lifetime of excited diphenyl ketyl radicals is lengthened by deuterium substitution. The largest effect is obyrved by substitution at the hydroxyllc positioni for example, the lifetimes are 3.9, 4.2, 8.7 and 10.5 ns for (C6H5)2COH, (C&)#OH, (C6Hs)2COD and (C&)2COD, respectively, in toluene or to

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irradiation of benzophcnone in isopropanol solution results in orange fluorescence, the yield of which depends on the laser pulse duration. This is shown to be due to benzophenone ketyl (hydroxydiphenyl methyl), formed as a photoproduct. It is shown that simple time-resolved fluorescence measurement