An ESR Study of Methylamino Radicals Photoproduced on the Porous Vycor Glass Surface
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概要
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The photochemical decomposition of methylamines adsorbed on the surface of the porous Vycor glass was studied at 77 K by the ESR method, and the ESR spectra of the methylamino radicals, CH<SUB>3</SUB>NH, CH<SUB>3</SUB>ND, CD<SUB>3</SUB>NH, CD<SUB>3</SUB>ND, CH<SUB>2</SUB>DNH, and CH<SUB>2</SUB>DND, were observed as primary radicals from variously-deuterated methylamines upon irradiation with the light of a low-pressure mercury lamp. This result shows that the primary process is preferentially a rupture of the N–H or N–D bond of methylamine. These spectra were characterized by an apparent quenching of the <I>N</I>-hyperfine splitting resulting from large hyperfine anisotropy, and by nearly isotropic proton hyperfine splittings in both methyl and amino groups. The hyperfine splitting constants of the N, H, and D nuclei of each radical were determined, and consequently a D-substitution effect on the β-proton hf splitting in the methyl group was found. The characteristics of the ESR spectra were discussed in relation to the adsorbed state of the methylamino radical on the porous Vycor glass surface.
- 公益社団法人 日本化学会の論文
著者
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Hatano Keiichiro
Faculty Of Pharmaceutical Sciences Nagoya City University
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Fujita Yuzaburo
Faculty Of Pharmaceutical Sciences Okayama University
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Katsu Takashi
Faculty Of Medicine Dentistry And Pharmaceutical Sciences Okayama University
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Shimamoto Norio
Faculty of Pharmaceutical Sciences, The University of Tokyo
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