Journal of the Chemical Society - Faraday Transactions p. 2139 - 2146 (1992)
Update date:2022-08-04
Topics:
Aloisi, Gian Gaetano
Elisei, Fausto
Latterini, Loredana
Laser flash photolysis was used to produce and investigate the lowest excited triplet state (T1) and radical ions (DAE+ radical and DAE- radical) of some diarylethylenes (DAE).In particular, the two trans-styrylnaphthalene isomers (n-StN, where n = 1 or 2 on the naphthalene) and four trans-1-(n-naphthyl)-2-(n'-pyridyl)ethylenes (n,n'-NPE, with n,n' = 1,4'; 2,2'; 2,3' and 2,4') were studied.The transients were characterized in terms of their absorption spectra, decay kinetics, molar absorption coefficients (for DAE+ radical and DAE- radical) and formation quantum yields (for T1 and DAE+ radical).Except for 1-StN, under direct excitation in the absence of quenchers (λexc = 308 and 347 nm), T1 -> Tn absorption was undetectable and DAE+ radical was the only transient observed, even though it was produced in low yield (ΦPI 1 of the DAEs was characterized in n-hexane, in the presence of 4-bromo-N, N-dimethylaniline (BrDMA) which enhances the intersystem-crossing quantum yields, while DAE- radical was produced and studied in acetonitrile, by laser excitation at 347 nm, in the presence of diethylaniline (DEA) and BrDMA.
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Doi:10.1039/c39920001102
(1992)Doi:10.1007/s00044-013-0637-x
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(1992)
