EXCITED-STATE INTERACTIONS IN PYRROLIDINOFULLERENES
EXCITED-STATE INTERACTIONS IN PYRROLIDINOFULLERENES
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吡咯烷富勒烯中的激发态相互作用
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
P. Kamat
中科院分区：
文献类型：
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作者：
K. G. Thomas;V. Biju;M. George;D. Guldi;P. Kamat
合成了两种新的吡咯烷富勒烯1和2，并研究了它们的光物理性质。吡咯烷富勒烯1具有连接至吡咯烷环的1、2和5位的三个苯基。另一方面，吡咯烷富勒烯 2 具有与 N-甲基苯胺端基的柔性连接，是富勒烯-苯胺二元组的原型。这两种功能化富勒烯衍生物的单线态和三线态激发态性质已通过皮秒和纳秒激光闪光光解进行了检查。这些富勒烯的单重态和三重态激发态在光谱的可见红外区域表现出特征吸收带。 C 60 与吡咯烷基团的官能化将激发态吸收最大值移动至蓝色。采用三种不同的猝灭剂 O 2 、TEMPO 和二茂铁来研究三重激发态的反应性。这些猝灭剂测定的双分子猝灭速率常数在5.3×10 8 至7.7×10 9 M -1 s -1 范围内。将这些官能化富勒烯的激发态相互作用与C 60 的激发态相互作用进行比较。
Two new pyrrolidinofullerenes, 1 and 2, have been synthesized, and their photophysical properties have been investigated. The pyrrolidinofullerene 1 has three phenyl groups attached to the 1, 2, and 5 positions of the pyrrolidine ring. The pyrrolidinofullerene 2, on the other hand, has a flexible attachment with an N-methylaniline end group and is the prototype of a fullerene-aniline dyad. Singlet and triplet excited-state properties of these two functionalized fullerene derivatives have been examined with picosecond and nanosecond laser flash photolysis. The singlet and triplet excited states of these fullerenes exhibit characteristic absorption bands in the vis-IR region of the spectrum. The functionalization of C 60 with pyrrolidine groups shift the excited-state absorption maxima to the blue. Three different quenchers, O 2 , TEMPO, and ferrocene, are employed to investigate the reactivity of triplet excited states. The bimolecular quenching rate constants determined for these quenchers were in the range of 5.3 × 10 8 to 7.7 × 10 9 M -1 s -1 . The excited-state interactions of these functionalized fullerenes are compared to that of C 60 .