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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3415

Title: Steady-state and time-resolved fluorescence anisotropy of 2,9-di-n-pentyl-5,6,11,12-tetraazo-5,6,11,12-tetrahydrocoronene-5,6,11,1 2-tetracarboxy-bis-n-heptadecylimide
Authors: Biasutti, MA
De Feyter, S
DE BACKER, Steve
Dutt, GB
De Schryver, FC
AMELOOT, Marcel
Schlichting, P
Mullen, K
Issue Date: 1996
Publisher: ELSEVIER SCIENCE BV
Citation: CHEMICAL PHYSICS LETTERS, 248(1-2). p. 13-19
Abstract: The photophysical properties of 2,9-di-n-pentyl-5,6,11,12-tetraazo-5,6,11,12-tetrahydrocoronene-5,6,11,1 2-tetracarboxy- bis-n-heptadecylimide (P5-17) in solution are investigated as a function of concentration, In 2-methyltetrahydrofuran, above 2 X 10(-5) M, a new absorption band with a maximum at 688 nm is observed indicating the formation of an aggregate. Upon excitation in this absorption band, emission from the aggregate with a maximum at 710 nm is observed, This emission coincides with that of the liquid crystalline discotic phase. The rotational dynamics of P5-17 and its aggregate are investigated using steady-state fluorescence measurements and time-resolved fluorescence anisotropy. From. the global analysis of the polarised fluorescence decay traces, it is found that for both monomer and aggregate, the anisotropy decay can be described by a monoexponential decay law. The rotational correlation time for the monomer is linked over two excitation wavelengths corresponding to S-0 --> S-1 and S-0 --> S-n transitions. For the aggregate, the excitation and emission dipoles are perpendicular and a fast fluorescence depolarization was observed.
Notes: KATHOLIEKE UNIV LEUVEN,DEPT CHEM,B-3001 HEVERLEE,BELGIUM. LIMBURGS UNIV CENTRUM,B-3590 DIEPENBEEK,BELGIUM. MAX PLANCK INST POLYMER RES,W-6500 MAINZ,GERMANY.
URI: http://hdl.handle.net/1942/3415
DOI: 10.1016/0009-2614(95)01282-6
ISI #: A1996TN65500003
ISSN: 0009-2614
Type: Journal Contribution
Appears in Collections: Research publications

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