Pentacene appended to a TEMPO stable free radical: The effect of magnetic exchange coupling on photoexcited pentacene

Erin T. Chernick; Rubén Casillas; Johannes Zirzlmeier; Daniel M. Gardner; Marco Gruber; Henning Kropp; Karsten Meyer; Michael R. Wasielewski; Dirk M. Guldi; Rik R. Tykwinski

doi:10.1021/ja510958k

Pentacene appended to a TEMPO stable free radical: The effect of magnetic exchange coupling on photoexcited pentacene

Erin T. Chernick, Rubén Casillas, Johannes Zirzlmeier, Daniel M. Gardner, Marco Gruber, Henning Kropp, Karsten Meyer, Michael R. Wasielewski, Dirk M. Guldi, Rik R. Tykwinski

Northwestern University

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

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.

Original language	English
Pages (from-to)	857-863
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	137
Issue number	2
DOIs	https://doi.org/10.1021/ja510958k
Publication status	Published - Jan 21 2015

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/ja510958k

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Pentacene appended to a TEMPO stable free radical : The effect of magnetic exchange coupling on photoexcited pentacene. / Chernick, Erin T.; Casillas, Rubén; Zirzlmeier, Johannes; Gardner, Daniel M.; Gruber, Marco; Kropp, Henning; Meyer, Karsten; Wasielewski, Michael R.; Guldi, Dirk M.; Tykwinski, Rik R.

In: Journal of the American Chemical Society, Vol. 137, No. 2, 21.01.2015, p. 857-863.

Research output: Contribution to journal › Article › peer-review

Chernick, Erin T. ; Casillas, Rubén ; Zirzlmeier, Johannes ; Gardner, Daniel M. ; Gruber, Marco ; Kropp, Henning ; Meyer, Karsten ; Wasielewski, Michael R. ; Guldi, Dirk M. ; Tykwinski, Rik R. / Pentacene appended to a TEMPO stable free radical : The effect of magnetic exchange coupling on photoexcited pentacene. In: Journal of the American Chemical Society. 2015 ; Vol. 137, No. 2. pp. 857-863.

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AU - Gardner, Daniel M.

AU - Gruber, Marco

AU - Kropp, Henning

AU - Meyer, Karsten

AU - Wasielewski, Michael R.

AU - Guldi, Dirk M.

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