par Vander Donckt, Emile 
;Toussaint, Philippe ;Van Vooren, Claude ;Van Sinoy, Alain
Référence Journal of the Chemical Society. Faraday Transactions I, 72, page (2301-2311)
Publication Publié, 1976
;Toussaint, Philippe ;Van Vooren, Claude ;Van Sinoy, Alain Référence Journal of the Chemical Society. Faraday Transactions I, 72, page (2301-2311)
Publication Publié, 1976
Article révisé par les pairs
| Résumé : | On irradiation with light of wavelengths < 310 nm, solutions of bifluorenylidene in isopropanol are phototransformed, the reaction products being bifluorenyl and 2-hydroxypropylbifluorenyl. The proportion of the two compounds and the quantum yield of disappearance of bifluorenylidene depend on its concentration. It is shown that auto-inhibition of the reaction is as efficient as quenching by anthracene, and that bifluorenylidene phosphorescence is observed only after excitation at wavelengths < 310 nm. These facts suggest that the primary step of the reaction takes place in the triplet manifold and that the reactive triplet state is not the T1 state. The quantum yield of disappearance of bifluorenylidene is an increasing linear function of the inverse of the square root of the intensity. A kinetic scheme which rationalizes these observations is proposed. |
