Author/Authors :
Hofkens، نويسنده , , J. and Latterini، نويسنده , , L. and De Belder، نويسنده , , G. and Gensch، نويسنده , , T. and Maus، نويسنده , , M. and Vosch، نويسنده , , T. and Karni، نويسنده , , Y. and Schweitzer، نويسنده , , G. and De Schryver، نويسنده , , F.C. and Hermann، نويسنده , , Akwasi A. and Mullen، نويسنده , , K.، نويسنده ,
Abstract :
The photophysical properties of a dendrimer (1) bearing eight peryleneimide chromophores on a polyphenylene core 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.
