Excitation Energy Shuttling in Oligothiophene鈥揇iketopyrrolopyrrole鈥揊ullerene Triads

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• 作者：Bram P. Karsten ; Patrizia P. Smith ; Arnold B. Tamayo ; Ren茅 A. J. Janssen
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：February 2, 2012
• 年：2012
• 卷：116
• 期：4
• 页码：1146-1150
• 全文大小：330K
• 年卷期：v.116,no.4(February 2, 2012)
• ISSN：1520-5215

文摘

The photophysical properties of a thiophene鈥揹iketopyrrolopyrrole oligomer linked to two fullerene units via alkyl linkers of different lengths have been investigated in solution. The molecules exhibit excitation energy shuttling between the singlet and triplet photoexcited states. Photoexcitation of the oligomer is followed by singlet energy transfer to the fullerene, intersystem crossing to the triplet state, and then triplet energy transfer back to the oligomer. Competing electron transfer reactions, followed by recombination to the triplet state, are energetically possible and cannot be ruled out but were not observed and seem to have a small contribution in solution.