IngentaConnect Interference of heavy-atom with magnetic spin effects in spin-cor...

Authors: Wu, Jie¹; Baumann, Dietrich²; Steiner, Ulrich²

Source: Molecular Physics, Volume 84, Number 5, 10 April 1995 , pp. 981-994(14)

Abstract:

The recombination kinetics of the radical pairs 3 (SeH · .. An ·+ ), with SeH + = selenine, An = aniline, and 3 (TH · .. An ·+ ) with TH + = thionine, p-Cl-An = 4-chloroaniline, in benzene/cetyldimethylbenzylammonium chloride/H 2 O reverse microemulsions was measured by ns-laser flash photolysis as a function of magnetic field and nanodroplet size. By comparison with the behaviour of the 3 (TH · .. An ·+ ) radical pairs evidence was provided that, besides the main route of triplet radical pair recombination through triplet to singlet spin conversion in situations when the radicals are separate and subsequent reaction on re-encountering as singlet radical pair, there is a finite probability that radical pairs encountering with overall triplet spin will directly recombine through electron transfer to singlet ground state products. The probability of this process, which is induced by spin-orbit coupling and is independent of a magnetic field, was evaluated for the three radical pairs specified above.

Document Type: Research article

DOI: 10.1080/00268979500100681

Affiliations: 1: Physikalisch-Chemisches Institut der Universität Zürich, Winterthurstrasse 190, 8057, Zürich, Switzerland 2: Fakultät für Chemie, Universität Konstanz, D-78434, Konstanz, Germany

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Interference of heavy-atom with magnetic spin effects in spin-correlated micellar radical pairs *