Magnetic field effect on the photoinduced electron transfer reaction between benzophenone and starburst dendrimers in water

Magnetic field effect (MFE) on the photoinduced electron transfer reaction between benzophenone and starburst dendrimers are studied in water by laser flash photolysis. In the presence of a magnetic field of 0.6 T, the relative yields of benzophenone anion radical at a 4–7 μs delay increase by about...

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Bibliographic Details
Published in:Chemical physics letters 2000-08, Vol.326 (5), p.383-388
Main Authors: Akimoto, Yukimi, Fujiwara, Yoshihisa, Tanimoto, Yoshifumi
Format: Article
Language:English
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Summary:Magnetic field effect (MFE) on the photoinduced electron transfer reaction between benzophenone and starburst dendrimers are studied in water by laser flash photolysis. In the presence of a magnetic field of 0.6 T, the relative yields of benzophenone anion radical at a 4–7 μs delay increase by about 15% in the case of 3-, 4-, and 5-generation dendrimers, whereas there is no appreciable MFE in the case of 1- and 2-generation dendrimers, 1,3-diaminopropane, and N,N,N′,N′-tetraethyl-1,3-diaminopropane. The MFE is interpreted in terms of a radical pair mechanism. Present results indicate clearly that the dendrimers of higher generation act not only as an electron donor but also as a supercage in the photoreaction.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(00)00820-4