Influence of C60 Aggregation on Pseudorotation in the Excited Triplet State Probed by Multifrequency Time-Resolved EPR
Influence of C60 Aggregation on Pseudorotation in the Excited Triplet State Probed by Multifrequency Time-Resolved EPR
复制标题
多频时间分辨EPR探测C60聚集对激发三重态赝自旋的影响
DOI：
10.1007/s00723-014-0569-8
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发表时间：
2014
影响因子：
1
通讯作者：
Seigo Yamauchi
中科院分区：
文献类型：
--
作者：
Hideto Matsuoka;Takuya Kotaki;Seigo Yamauchi
用多频电子顺磁共振技术研究了C60聚集对激发三重态C60时间分辨电子顺磁共振(EPR)的影响。在新鲜的甲苯溶液中观察到了与温度无关的X波段(9.7 GHz)的TR-EPR谱，而文献报道的是与温度有关的谱。实验光谱表明，即使在较低的温度下，原始C60在冷冻甲苯溶液中的假旋转也不会被冻结。对TR-EPR及其衰变动力学的仔细研究表明，C60的聚集会影响其假旋转。X波段和W波段(94.9 GHz)的比较结果表明，毛细效应可以加速聚集。从衰变动力学分析中提取了三个衰变常数。在10-40℃温度范围内，假旋转与温度无关。衰变动力学的温度依赖性表明，在较高温度下，假旋转不受C60聚集的影响。
The influence of C60aggregation on time-resolved (TR) electron paramagnetic resonance (EPR) of C60in the excited triplet state was investigated by multifrequency EPR techniques. Temperature-independent X-band (9.7 GHz) TR-EPR spectra were observed in a fresh toluene solution, while temperature-dependent ones were reported in literatures. The experimental spectra in this study indicated that the pseudorotation of pristine C60in frozen toluene solution is not frozen out even at lower temperatures. Careful investigations of TR-EPR and its decay kinetics demonstrated that the pseudorotation can be affected by C60aggregation. A comparison between X- and W-band (94.9 GHz) results indicated that the aggregation can be accelerated by a capillary effect. Three decay constants were extracted from the analysis of the decay kinetics. The fastest component was ascribed to the pseudorotation, which was independent of temperature in the range of 10–40 K. The temperature dependences of the decay kinetics showed that the pseudorotation is not affected by C60aggregation at higher temperatures.
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DOI：
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期刊：
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