EXCITATION OF C-60, SOLUBILIZED IN WATER BY TRITON X-100 AND GAMMA-CYCLODEXTRIN, AND SUBSEQUENT CHARGE SEPARATION VIA REDUCTIVE QUENCHING
EXCITATION OF C-60, SOLUBILIZED IN WATER BY TRITON X-100 AND GAMMA-CYCLODEXTRIN, AND SUBSEQUENT CHARGE SEPARATION VIA REDUCTIVE QUENCHING
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DOI：
10.1016/0009-2614(94)00481-1
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发表时间：
1994-07-01
影响因子：
2.8
通讯作者：
ASMUS, KD
中科院分区：
文献类型：
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作者：
GULDI, DM;HUIE, RE;ASMUS, KD
用激光闪光光解法研究了C_（60）在Triton X-100胶束中的激发。在胶束组装体、包埋于γ-环糊精中的富勒烯水溶液、醇类和非极性甲苯中，研究了二氮杂双环辛烷（DABCO）对三重激发态C-3（60）的还原猝灭作用.在水介质中，六氰合铁（II）酸钾和碘化钾也被用于还原淬灭过程。C60-。自由基阴离子在所有的调查已通过其红外吸收的特点。C_（60）~-的形成和半衰期。已经被证明强烈依赖于环境的极性。通过利用DABCO作为猝灭剂，在胶束组装体中观察到440 μ s的半衰期，而在丙-2-醇和丁-1-醇中的相应值分别为110 μ s和98 μ s。在水溶液中，自由基阴离子γ-CD/C60-.衰变的半衰期为59 μ s，相反，在非极性甲苯中没有形成任何C60-。可以被检测到。结果与电荷分离的C-3（60）-猝灭剂接触对一致。
The excitation of C60 incorporated in triton X-100 micelles has been studied by laser flash photolysis. Reductive quenching of triplet-excited C-3(60) by diazabicyclooctane (DABCO) has been established in the micellar assembly, in aqueous solution of the fullerene embedded in gamma-cyclodextrin, in alcohols and non-polar toluene. In aqueous media potassium hexacyanoferrate (II) and potassium iodide have been employed in the reductive quenching process as well. The C60-. radical anion in all investigations has been characterized by its IR absorption. The formation and the half-life of C60-. have been shown to be strongly dependent on the polarity of the environment. By utilizing DABCO as a quencher a half-life of 440 mus has been observed in the micellar assembly, while the respective values in propan-2-ol and butan-1-ol are 110 and 98 mus, respectively. In aqueous solution the radical anion gamma-CD/C60-. decays with a half-life of 59 mus and, in contrast, in the non-polar toluene no formation of any C60-. could be detected. The results are consistent with a charge-separated C-3(60)-quencher contact pair.