Singlet–Singlet Annihilation Leading to a Charge-Transfer Intermediate in Chromophore-End-Capped Pentaphenylenes

Autor:	Eduard Fron, Frans C. De Schryver, Gerd Schweitzer, Antoine Van Vooren, Mark Van der Auweraer, David Beljonne, Josemon Jacob, Klaus Müllen, Johan Hofkens
Rok vydání:	2007
Předmět:	Annihilation Chemistry Excited state Ultrafast laser spectroscopy Singlet state Physical and Theoretical Chemistry Solvent effects Chromophore Photochemistry Femtochemistry Atomic and Molecular Physics and Optics Photoinduced electron transfer
Zdroj:	ChemPhysChem. 8:1386-1393
ISSN:	1439-7641 1439-4235
Popis:	The excited-state properties of two peryleneimide chromophore end-capped pentaphenylene compounds were investigated in detail using femtosecond transient absorption and single-photon timing experiments. Singlet-singlet annihilation was found to promote one chromophore into a higher excited state and results in the formation of an ultra-short-living intermediate charge-transfer (CT) state in the S(n)-S(1) deactivation pathway. In low-polarity solvents, this CT state is found to be energetically higher than the first excited state and thus cannot be populated via one-photon excitation. The observed CT state decays with a time constant of about 1 ps to form the lowest singlet excited state. These results demonstrate the potential use of the singlet-singlet annihilation as a novel tool in studying reactions occurring in states that are energetically above the S(1).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acae5595df3646624ea77043b06b77d0 https://doi.org/10.1002/cphc.200700136 Zobrazit plný text záznamu Plný text