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Mediator centres and light-induced electron transfer in donor-acceptor systems
Ist Teil von
Chemical physics, 1989-08, Vol.135 (2), p.209-217
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
1989
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Frozen vitreous triethylamine solutions of magnesium etioporphyrin-1 (MgEP) both with and without CCl
4 or CHCl
3 additives have been studied at 77 K. It was shown that light irradiation of the solutions in the Soret band or the long-wave absorption band of the porphyrin molecules results in charge separation by means of electron transfer from a triethylamine molecule to an excited porphyrin molecule and subsequent light-induced tunnel electron transfer from complexes (MgEP
−·[N(C
2H
5)
3]
2
+) to remote porphyrin molecules. An addition of CCl
4 or CHCl
3 into a triethylamine solution of MgEP was observed to increase the efficiency of the light-induced tunnel electron transfer from (MgEP
−·[N(C
2H
5)
3]
2
+) to MgEP by several orders. A theoretical explanation of this phenomenon, in which molecules CCl
4 or CHCl
3 were treated as mediators, was offered. A comparison of experimental and theoretical data made it possible to estimate the energy structure of additives' molecules.