par Birks, John 
;Birch, DJS J S;Cordemans, E.;Vander Donckt, Emile
Référence Chemical physics letters, 43, 1, page (33-36)
Publication Publié, 1976-10
;Birch, DJS J S;Cordemans, E.;Vander Donckt, Emile Référence Chemical physics letters, 43, 1, page (33-36)
Publication Publié, 1976-10
Article révisé par les pairs
| Résumé : | The fluorescence spectra, quantum yields and lifetimes of [10]-, [11]-, [12]-, [13]-, and [14]-helicene and 3,15-ethanoheptahelicene have been observed in 1,4-dioxan solution at room temperature. The fluorescence occurs from the 1 Lb state, which is not observed in absorption. The fluoroscence rate parameter decreases with increase in ring number N, in a manner which depends on whether N is odd or even. The intersystem crossing rate parameter increases with N up to N = 11 and then decreases. The interval between the fluorescence maxima, which is equated to the So symmetrical vibrational mode, decreases from 1200 cm-1 (N = 6) to 650 cm-1 (N = 13). © 1976. |
