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KMID : 1059519930370030271
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Journal of the Korean Chemical Society
1993 Volume.37 No. 3 p.271 ~ p.278
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A Photoreduction of Phenanthrenequinone by ESR and TRESR Spectroscopy(Ⅰ)-Solvent Effect on Hyperfine-Splitting Constant of Radicals
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Hong Dae-Il
Kim Chang-Jin
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Abstract
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The hyperfine splitting constants of phenanthrenequinone anion radical have been determined for the solution of triethylamine with 2-propanol, 2-pentanol or benzene by cwESR and time-resolved ESR methods. The radical anion was produced by photolysis using a pulsed excimer laser. The resulting hyperfine splitting constant AH1 and AH2 are 1.662, 0.378 in 2-propanol, 1.602, 0.361 in 2-pentanol and 1.518 in benzene respectively. The hyperfine coupling constants decrease with the decreasing of polarity of the mixed solvent. The tendency of the variation depends on the polarity of the solvents, thus, making it in impossible to observe the magnetic equivalent proton in a mixed solvent of nonpolar benzene. Particularly, time-resolved ESR spectrum of triethylamine radical (TEA·) has been observed in 0.15∼0.30 ㎲ from the solvent of 3 : 1 with 2-pentanol and triethylamine. Thus from the results of solvent effect, we can suggest that the identification of the unstable short-lived spin polarized phenanthrenequinone anion radical(*PQ·-) proceed through photochemistry.
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