The yield of escaping benzenesulfonyl radical was found to be increased by a magnetic field. The yield at 1.2 T was 1.53 k 0.05 times that at 0 T. From the observed magnetic field effects, the present reaction was proved to occur from triplet radical pairs.
A laser flash photolysis study of the effect of intense magnetic fields on the photoreaction of benzophenone in SDS micellar solution
β Scribed by Yoshihisa Fujiwara; Masahiro Mukai; Tomoyuki Tamura; Yoshifumi Tanimoto; Masaharu Okazaki
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 462 KB
- Volume
- 213
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The magnetic field dependence of the lifetime of the benzophenone ketyl-SDS-derived radical pair in SDS micellar solution is divided into three regions. In a low magnetic field ( ~0.3 T) the lifetime increases steeply, it exhibits a square dependence on the magnetic field strength between 0.3 and 2 T, and then becomes constant (2-14 T). The mechanism of the observed magnetic field dependence is discussed.
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The magnetic field effect on the hydrogen abstraction reaction of anthraquinone in sodium dodecyl sulfate (SDS) micellar solution has been studied by two-step laser escitation fluorescence including a variable delay technique. The risetime of the "cage product" is 380 ns at 0 G and 890 ns at 800 G,
The rate constants (kHA and klQ) for the hydrogen atom abstraction (HA) and induced-quenching (IQ) processes between triplet benzophenone (3Bp \*) and halogenated toluenes (XTL) were determined by means of nanosecond laser flash photolysis techniques. It was found that the klQ value increased propor
Absolute rate constant& k, of the reaction OH + HN03 were determined using a puked laser photolyskresonance ab\_ sorption technique\_ The measured value in cm3 mol-' s-l at 230. lolo k(l-16 Torr HN03) = 7.57 + 0.64. k(S00 Torr N2) = 7.20 f 0.66 and k(600 Torr SFe) = 8.37 f 0.45. indimtc that any pre