首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photloinduced Electron Transfer and Adduct Formation between C_(60)/C_(70) and Optically Active 1,1'-Binaphthyl-2,2'-diamine
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Photloinduced Electron Transfer and Adduct Formation between C_(60)/C_(70) and Optically Active 1,1'-Binaphthyl-2,2'-diamine

机译:C_(60)/ C_(70)与旋光1,1'-联萘-2,2'-二胺之间的光致电子转移和加合物形成

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摘要

Photoinduced electron transfer and adduct formation between C_(60)/C_(70) and 1,1'-binaphthyl-2,2'-diamine (BNA) have been studied by nanosecond laser flash photolysis and steady-state photolysis as well as circular dichroism measurements. Quantum yields (#PHI#_(et)~T) and rate constants of electron transfer from BNA to the excited triplet state of C_(60)/C_(70) have been determined by observing the transient absorption bands in the near-IR region where the triplet states and anion radicals of fullerenes appear. Compared with the planar naphthylamine moiety, #PHI#_(et)~T values of perpendicular bichromophoric BNA are low because of hindrance of approach to round fullerenes. The formation of an optically active adduct between C_(60) and BNA in a polar solvent was observed upon excitation with light at #lambda# > 330 nm where both C_(60) and BNA are light-absorbing. The reaction mechanism for the optically active adduct formation can be explained as a result of th addition reaction of the N-centered radical formed by deprotonation of BNA~+, which is produced by direct photoejection.
机译:通过纳秒激光闪光光解法和稳态光解法以及环形法研究了C_(60)/ C_(70)与1,1'-联萘-2,2'-二胺(BNA)之间的光诱导电子转移和加合物形成二向色性测量。通过观察近红外的瞬态吸收带,确定了量子产率(#PHI #_(et)〜T)和电子从BNA转移到C_(60)/ C_(70)的激发三重态的速率常数。富勒烯三重态和阴离子自由基出现的区域。与平面的萘胺部分相比,垂直双发色BNA的#PHI #_(et)〜T值较低,这是因为其难以接近圆形富勒烯。在#lambda#> 330 nm处用光激发时,观察到极性溶剂中C_(60)和BNA之间形成了光学活性加合物,其中C_(60)和BNA均吸光。光学活性加合物形成的反应机理可以解释为由直接光喷射产生的BNA〜+的去质子化形成的N-中心自由基的加成反应的结果。

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