H. Staerk et al., ELECTRON-TRANSFER AND MAGNETIC-FIELD EFFECTS IN DONOR-ACCEPTOR SYSTEMS LINKED BY A HYDROCARBON CHAIN INCORPORATING PHENYL GROUPS, Zeitschrift für physikalische Chemie, 188, 1995, pp. 61-73
Citations number
29
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Fluorescence quenching experiments and studies of the spin dynamics in
intramolecular radical ion pairs are presented. Compounds investigate
d are bichromophoric molecules containing 1-pyrenyl (Py) and 4-N,N-dim
ethylaminophenyl (DMA), linked by a hydrocarbon chain incorporating ph
enyl groups (Phi). The results demonstrate the participation of the ar
omatic spacers in the primary electron transfer process. Such a spacer
-molecule-assisted mechanism, however, seems to be absent in the recom
bination reaction (return electron transfer) of the radical ion pair.
Hyperfine-driven spin mixing, leading to a magnetic field effect in th
e triplet and exciplex yields, has only been observed with the compoun
d with a longer chain, namely Py-CH2-Phi-(CH2)(2)-Phi-CH2-DMA in aceto
nitrile.