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@article{726056, author = {Born, R. and Fischer, W. and Heger, Dominik and Tokarczyk, B. and Wirz, Jakob}, article_number = {5}, keywords = {LASER FLASH-PHOTOLYSIS; CONJUGATED RADICALS; ELECTRON-TRANSFER; PHOTOISOMERIZATION; MECHANISM; DERIVATIVES; SINGLET; STATE; 6-PHENOXY-512-NAPHTHACENEQUINONE; PHOTOCHEMISTRY}, language = {eng}, issn = {1474-905X}, journal = {PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES}, title = {Photochromism of phenoxynaphthacenequinones: diabatic or adiabatic phenyl group transfer?}, volume = {6/2007}, year = {2007} }
TY - JOUR ID - 726056 AU - Born, R. - Fischer, W. - Heger, Dominik - Tokarczyk, B. - Wirz, Jakob PY - 2007 TI - Photochromism of phenoxynaphthacenequinones: diabatic or adiabatic phenyl group transfer? JF - PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES VL - 6/2007 IS - 5 SP - 552-559 EP - 552-559 SN - 1474905X KW - LASER FLASH-PHOTOLYSIS KW - CONJUGATED RADICALS KW - ELECTRON-TRANSFER KW - PHOTOISOMERIZATION KW - MECHANISM KW - DERIVATIVES KW - SINGLET KW - STATE KW - 6-PHENOXY-512-NAPHTHACENEQUINONE KW - PHOTOCHEMISTRY N2 - The photochromic reactions of 6-phenyloxy-5,12-naphthacenequinone ( 1) and of the 6,11-diphenyloxy derivative 2 were investigated by subpicosecond pump-probe, photoacoustic, and emission spectroscopies, and by nanosecond laser. ash photolysis ( LFP). The transformation of the trans-quinones 1 and 2 to their ana-isomers proceeds via short-lived triplet states of 1 and 2 ( tau ca. 2 ns) and spiro-bridged biradical intermediates ( ca. 6 ns). The long-lived ( mu s) ana-triplets that are observed by LFP of 1 and 2 are formed ( predominantly) by reexcitation of the biradicals and ana-quinones, which appear during the laser pulse. The reverse reaction, ana -> trans, proceeds exclusively from the lowest pi, pi* singlet state of the ana-quinones. ER -
BORN, R., W. FISCHER, Dominik HEGER, B. TOKARCZYK and Jakob WIRZ. Photochromism of phenoxynaphthacenequinones: diabatic or adiabatic phenyl group transfer? \textit{PHOTOCHEMICAL \&{} PHOTOBIOLOGICAL SCIENCES}. 2007, 6/2007, No~5, p.~552-559, 7 pp. ISSN~1474-905X.
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