Biradical spin dynamics with distance-dependent exchange interaction and electron transfer efficiency

✍ Scribed by Robert Bittl; Klaus Schulten

• Book ID: 103025388
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 457 KB
• Volume: 173
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)85289-o

✦ Synopsis

The spin dynamics and reaction kineticsof photogenerated zwitterionic biradicals of the type zA--(CHL)ll-*Df (n=8,9, IO) are described for a model which assumes the same A-D distance dependence for a "through space" exchange interaction and for the efficiency of electron back-transfer to the singlet ground state 'A-(CH2),-I'D and to a triplet excited state SA*-(CH2)n-'D.

The model is independent of the length n of the polymethylene chain and accounts well for the three types ofobservation on the biradicals: the mono-exponential character of the biradic.4 decay, the life time associated with this decay, and the magnetic field dependence of the yield of the triplet excited state.

'A -(CH& -'D Scheme I.