INTERFERENCE OF HEAVY-ATOM WITH MAGNETIC SPIN EFFECTS IN SPIN-CORRELATED MICELLAR RADICAL PAIRS

被引:12
作者
WU, JQ [1 ]
BAUMANN, D [1 ]
STEINER, UE [1 ]
机构
[1] UNIV KONSTANZ,FAK CHEM,D-78434 CONSTANCE,GERMANY
关键词
D O I
10.1080/00268979500100681
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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/H2O 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.
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页码:981 / 994
页数:14
相关论文
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