TY - JOUR
T1 - Pentacene appended to a TEMPO stable free radical
T2 - The effect of magnetic exchange coupling on photoexcited pentacene
AU - Chernick, Erin T.
AU - Casillas, Rubén
AU - Zirzlmeier, Johannes
AU - Gardner, Daniel M.
AU - Gruber, Marco
AU - Kropp, Henning
AU - Meyer, Karsten
AU - Wasielewski, Michael R.
AU - Guldi, Dirk M.
AU - Tykwinski, Rik R.
N1 - Publisher Copyright:
© 2014 American Chemical Society.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/1/21
Y1 - 2015/1/21
N2 - 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.
AB - 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.
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U2 - 10.1021/ja510958k
DO - 10.1021/ja510958k
M3 - Article
C2 - 25478639
AN - SCOPUS:84921499330
VL - 137
SP - 857
EP - 863
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 2
ER -