碳六十的光化學、光物理性質：電子自旋光譜研究

Photophysical and Photochemical Studies Of C_(60) by ESR Spectroscopy

10.6623/chem.1997047

黃玉蓮(Yu-Lien Hawang)；黃國柱(Kuo-Chu Hwang)

磁六十 ； 光化學 ； 電子傳遞 ； ESR 光譜 ； C_(60) ； Photochemistry ； Electron Transfer ； ESR Spectroscopy

化學

55卷4期（1997 / 12 / 01）

53 - 58

繁體中文

碳六十有機溶液於照光下，產生三重態碳六十，兩個三重態碳六十會進行自身氧化還原反應而生成C_(60)^+ 及C_(60)^-正負離子自由基，C_(60)^+ 及C_(60)^-離子自由基的生成可合理解釋文獻上所報導諸多碳六十光化學、物理性質，如非線性光學性質、光激發高分子化、及三重態碳六十生命期隨雷射光強度變化等現象。ESR光譜研究亦顯示，C_(60)^+ 會與溶劑(如，甲苯、苯甲氰)及親核試劑(如：水、甲醇)進行加成反應。而C_(60)^-則極易與O_2 作用生成C_(60)O_2^-，C_(60)O_2^-有二種結構異構物，在文獻上以往一直被錯誤指認為C_(60)^(2-)或自由態C_(60)^-自由基。

Triplet C_(60) (^3 C_(60)) was formed by irradiation of C_(60)-organic solvent system. Two ^3C_(60) were found to undergo disproportionation.and generate C_(60)^+. as well as C_(60)^- ion radicals. The formation of C_(60)^+ and C_(60)^- ion radicals can rationalize various photophysical and photochemical properties of C_(60) as reported in literature, such as, nonlinear optical property, photoinduced polymerization of C_(60) solid thin film, and laser light intensity dependence of ^3C_(60) lifetime,etc. ESR studies reveal that C_(60)^+. cation radical can react with solvent molecules (e.g., toluene and benzonitrile) and nucleophiles (e .g., H_2O and methanol). C_(60)^- anion radical reacts with O_2 to form C_(60)O_2^-. C_(60)O_2^-has two interconvertable structual isomers, which were often misassigned in literature as CGO2dianion (radical) or free C_(60)^- radical.