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Valence isomerization in dendrimers by photo-induced electron transfer and energy transfer from the dendrimer backbone to the core

Paper ID Volume ID Publish Year Pages File Format Full-Text
28939 44107 2007 9 PDF Available
Title
Valence isomerization in dendrimers by photo-induced electron transfer and energy transfer from the dendrimer backbone to the core
Abstract

A series of poly(aryl ether) dendrimers with a norbornadiene (NBD) group attaching to the core (Gn-NBD), generations 1–4, were synthesized and characterized, and their photophysical and photochemical properties were examined. The fluorescence of the dendrimer backbone is quenched by the norbornadiene group as a result of the electron transfer and energy transfer from the dendrimer backbone to the norbornadiene group in Gn-NBD. Selective excitation of the dendrimer backbone results in an isomerization of the norbornadiene group to the quadricyclane (QC) group. The intramolecular electron transfer and energy transfer efficiencies are ca. 0.93, 0.73, 0.54, 0.30 in dichloromethane, and ca. 0.90, 0.70, 0.55, 0.34 in tetrahydrofuran for generations 1–4, respectively, with the rate constant ca. 1010 s−1. The light-harvesting ability of these dendritic molecules is demonstrated by the enhanced valence isomerization rate of NBD to QC with increasing generation.

Keywords
Dendrimers; Photo-induced electron transfer and energy transfer; Light-harvesting; Norbornadiene; Valence isomerization
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Valence isomerization in dendrimers by photo-induced electron transfer and energy transfer from the dendrimer backbone to the core
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 185, Issue 1, 1 January 2007, Pages 67–75
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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