Radical ion pairs in sexithiophene/fullerene blends studied by transient epr spectroscopy.

被引：0
作者：
Pasimeni, L [1 ]
Ruzzi, M [1 ]
Prato, M [1 ]
Da Ros, T [1 ]
Barbarella, G [1 ]
Zambianchi, M [1 ]
机构：
[1] Univ Padua, Dept Phys Chem, I-35131 Padua, Italy
来源：
RECENT ADVANCES IN THE CHEMISTRY AND PHYSICS OF FULLERENES AND RELATED MATERIAL, VOL 7 | 1999年 / 99卷 / 12期
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中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Radical ion pairs generated by Photoinduced Electron Transfer in methylsulfanyl sexithiophene/fulleropyrrolidine derivatives deposited as films are studied by transient EPR spectroscopy. The spin polarization pattern of the transient EPR spectrum consist of characteristic antiphase emission/absorption lines typical of spin correlated radical pairs with electron dipolar and spin exchange interactions. The mean distance of 2.8 nm between the two unpaired electrons of the pair is obtained from the dipolar coupling constant value of -0.12 mT extracted from spectrum simulation The charge-separated state has a lifetime of 10 mu s at 120 K. A mechanistic model is proposed for the generation and decay processes involving the observed intermediate radical ion pair. The Gaussian spectrum lineshape for positive and negative charges is interpreted in terms of localized electron-hole pairs.
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页码：304 / 314
页数：3
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