Magnetic Field and Temperature Dependencies Shed Light on the Recombination Kinetics of a Transition Metal Donor/Acceptor System | Zendy

Till von Feilitzsch | Zendy; Peter Härter | Zendy; Olav Schiemann | Zendy; M.E. MichelBeyerle | Zendy; Ulrich E. Steiner | Zendy; Peter Gilch | Zendy

Open Access

Magnetic Field and Temperature Dependencies Shed Light on the Recombination Kinetics of a Transition Metal Donor/Acceptor System

Author(s) -

Till von Feilitzsch,

Peter Härter,

Olav Schiemann,

M.E. MichelBeyerle,

Ulrich E. Steiner,

Peter Gilch

Publication year - 2005

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/ja0547174

Subject(s) - chemistry , femtochemistry , intramolecular force , kinetics , moiety , picosecond , electron transfer , photochemistry , chemical physics , femtosecond , ferrocene , electron paramagnetic resonance , recombination , photoinduced electron transfer , nuclear magnetic resonance , laser , stereochemistry , optics , electrochemistry , gene , biochemistry , physics , electrode , quantum mechanics

The radical pair recombination of an intramolecular electron-transfer system containing a transition metal moiety has been addressed by femtosecond spectroscopy. The radical pair is formed by ultrafast electron transfer (90 fs) from a ferrocene residue to a photoexcited Nile blue moiety. Its recombination proceeds on the picosecond time scale in a multiexponential fashion. The kinetic pattern is a manifestation of spin processes competing with electron transfer. Magnetic field effects on these kinetics allow one to disentangle the two contributions. Their temperature dependencies yield the activation parameters of the two processes. The discussion focuses on the mechanism of electron spin relaxation. Strong evidence for the Orbach/Kivelson mechanism will be given.

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