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

[en] 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 Sn-S1 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 S1.

Disciplines :

Physics

Author, co-author :

Fron, E.

Schweitzer, G.

Jacob, J.

Van Vooren, Antoine

Beljonne, David ; Université de Mons > Faculté des Sciences > Chimie des matériaux nouveaux

Müllen, K.

Hofkens, J.

Van Der Auweraer, M.

De Schryver, F.C.

Language :

English

Title :

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

Publication date :

25 June 2007

Journal title :

Chemphyschem: A European Journal of Chemical Physics and Physical Chemistry

ISSN :

1439-4235

Publisher :

John Wiley & Sons, United Kingdom

Volume :

Issue :

Pages :

1386-1393

Peer reviewed :

Peer Reviewed verified by ORBi

Research unit :

S817 - Chimie des matériaux nouveaux

Research institute :

R400 - Institut de Recherche en Science et Ingénierie des Matériaux

Available on ORBi UMONS :

since 10 June 2010

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