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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28531.0, MPI für Polymerforschung / MPI Polymerforschung
Generation-dependent energy dissipation in rigid dendrimers studied by femtosecond to nanosecond time-resolved fluorescence spectroscopy
Authors:Lor, M.; De, R.; Jordens, S.; De Belder, G.; Schweitzer, G.; Cotlet, M.; Hofkens, J.; Weil, T.; Herrmann, A.; Müllen, Klaus; Van der Auweraer, M.; De Schryver, F. C.
Date of Publication (YYYY-MM-DD):2002-03-14
Title of Journal:Journal of Physical Chemistry A
Journal Abbrev.:J. Phys. Chem. A
Issue / Number:10
Start Page:2083
End Page:2090
Review Status:No review
Audience:Not Specified
Abstract / Description:Intramolecular kinetic processes in a series of second- generation polyphenyl dendrimers with multiple peryleneimide chromophores attached to the para position of the outer phenyl ring were investigated by steady-state and femtosecond to nanosecond time-resolved fluorescence spectroscopy. The results obtained were compared to the ones of the corresponding first- generation dendrimer series. The energy-hopping rate constant, k(hopp), observed from anisotropy decay times was found to be 5 times smaller than that of the first-generation series and scales well with the difference in average distance between the chromophores. In addition to the processes observed in first- generation dendrimers in the ultrafast time domain by fluorescence up-conversion, a second. annihilation process is found in the second-generation multichromophoric dendrimer. The observation of two singlet-singlet annihilation processes in this compound can be explained by the presence of a mixture of constitutional isomers leading to a broader distribution of distances between neighboring chromophores compared to first- generation multichromophoric dendrimers.
Comment of the Author/Creator:Date: 2002, MAR 14
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200 F, B- 3001 Heverlee, Belgium
Identifiers:ISI:000174369800025 [ID No:1]
ISSN:1089-5639 [ID No:2]
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