| Literature DB >> 25478639 |
Erin T Chernick1, Rubén Casillas, Johannes Zirzlmeier, Daniel M Gardner, Marco Gruber, Henning Kropp, Karsten Meyer, Michael R Wasielewski, Dirk M Guldi, Rik R Tykwinski.
Abstract
Understanding the fundamental spin dynamics of photoexcited pentacene derivatives is important in order to maximize their potential for optoelectronic applications. Herein, we report on the synthesis of two pentacene derivatives that are functionalized with the [(2,2,6,6-tetramethylpiperidin-1-yl)oxy] (TEMPO) stable free radical. The presence of TEMPO does not quench the pentacene singlet excited state, but does quench the photoexcited triplet excited state as a function of TEMPO-to-pentacene distance. Time-resolved electron paramagnetic resonance experiments confirm that triplet quenching is accompanied by electron spin polarization transfer from the pentacene excited state to the TEMPO doublet state in the weak coupling regime.Entities:
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Year: 2015 PMID： 25478639 DOI： 10.1021/ja510958k
Source DB: PubMed Journal: J Am Chem Soc ISSN： 0002-7863 Impact factor: 15.419