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Verfasst von:Herz, Julia [VerfasserIn]   i
 Buckup, Tiago [VerfasserIn]   i
 Paulus, Fabian [VerfasserIn]   i
 Engelhart, Jens U. [VerfasserIn]   i
 Bunz, Uwe H. F. [VerfasserIn]   i
 Motzkus, Marcus [VerfasserIn]   i
Titel:Unveiling singlet fission mediating states in TIPS-pentacene and its aza derivatives
Verf.angabe:Julia Herz, Tiago Buckup, Fabian Paulus, Jens U. Engelhart, Uwe H.F. Bunz, Marcus Motzkus
E-Jahr:2015
Jahr:12 June 2015
Umfang:9 S.
Fussnoten:Gesehen am 31.08.2020
Titel Quelle:Enthalten in: The journal of physical chemistry <Washington, DC> / A
Ort Quelle:Washington, DC : Soc., 1997
Jahr Quelle:2015
Band/Heft Quelle:119(2015), 25, Seite 6602-6610
ISSN Quelle:1520-5215
Abstract:Femtosecond pump-depletion-probe experiments were carried out in order to shed light on the ultrafast excited-state dynamics of triisopropylsilylethynyl (TIPS)-pentacene and two nitrogen-containing derivatives, namely, diaza-TIPS-pentacene and tetraaza-TIPS-pentacene. Measurements performed in the visible and near-infrared spectral range in combination with rate model simulations reveal that singlet fission proceeds via the extremely short-lived intermediate 1TT state, which absorbs in the near-infrared spectral region only. The T1 → T3 transition probed in the visible region shows a rise time that comprises two components according to a consecutive reaction (S1 → 1TT → T1). The incorporation of nitrogen atoms into the acene structure leads to shorter dynamics, but the overall triplet formation follows the same kinetic model. This is of particular importance, since experiments on tetraaza-TIPS-pentacene allow for investigation of the triplet state in the visible range without an overlapping singlet contribution. In addition, the pump-depletion-probe experiments show that the triplet absorption in the visible (T1 → T3) and near-infrared (T1 → T2) regions occurs from the same initial state, which was questioned in previous studies. Furthermore, an additional ultrafast transfer between the excited triplet states (T3 → T2) is identified, which is also in agreement with the rate model simulation. By applying depletion pulses, which are resonant with higher vibrational levels, we gain insight into internal vibrational energy redistribution processes within the triplet manifold. This additional information is of great relevance regarding the study of loss channels within these materials.
DOI:doi:10.1021/acs.jpca.5b02212
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1021/acs.jpca.5b02212
 DOI: https://doi.org/10.1021/acs.jpca.5b02212
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1728050863
Verknüpfungen:→ Zeitung

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