Photophysical study of a multi-chromophoric dendrimer by time-resolved fluorescence and femtosecond transient absorption spectroscopy

被引：84
作者：
Hofkens, J
Latterini, L
De Belder, G
Gensch, T
Maus, M
Vosch, T
Karni, Y
Schweitzer, G
De Schryver, FC
Hermann, A
Müllen, K
机构：
[1] Katholieke Univ Leuven, Dept Chem, B-3001 Heverlee, Belgium
[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
来源：
CHEMICAL PHYSICS LETTERS | 1999年 / 304卷 / 1-2期
关键词：
D O I：
10.1016/S0009-2614(99)00287-0
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The photophysical properties of a dendrimer (1) bearing eight peryleneimide chromophores on a polyphenylene care were investigated by picosecond fluorescence and femtosecond transient absorption techniques. A peryleneimide attached to a hexaphenylbenzene unit (2) served as model compound. Multi-exponential fluorescence and fs-transient absorption decays were observed only for 1, which could therefore be attributed to excimer-like interactions among neighbouring peryleneimides. The comparative time-resolved polarisation results on 1 and 2 indicate the occurrence of different depolarisation processes in the dendrimer assignable to the rotation of the molecule, a fractional motion maybe of a dendrimer branch and to an intramolecular energy transfer process. (C) 1999 Elsevier Science B.V. All rights reserved.
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页码：1 / 9
页数：9
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