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Electron transfer, charge stabilization and charge recombination in naphthalenediimide-tryptophan immobilized on silica particles

Paper ID Volume ID Publish Year Pages File Format Full-Text
28633 44082 2006 4 PDF Available
Title
Electron transfer, charge stabilization and charge recombination in naphthalenediimide-tryptophan immobilized on silica particles
Abstract

N,N′-Bis(2-phosphonoethyl)-1,4,5,8-naphthalenediimide (DPN) derivatives containing Ac-Trp (DPN-W) and Ac-Trp-Ala-Ala (DPN-AAW) were prepared on silica-gel solid supports by using a combined zirconium phosphonate and Fmoc-solid phase peptide synthesis strategy. A photophysical study of these particles revealed that the tryptophan (W) residue was subject to less polar surroundings on the DPN-AAW than in the DPN-W particle and a much more intense DPN fluorescence emission was observed on DPN-AAW than on DPN-W. The transient spectra of the particles showed the presence of DPN radical anion and Trp radical cation on the DPN-AAW but no signal was obtained for DPN-W. This finding is indicative of a very fast charge transfer between DPN and the tryptophan moiety that is followed by charge recombination on DPN-W and by charge stabilization on DPN-AAW.

Keywords
Naphthalenediimide; Tryptophan; Charge transfer; Silica particles
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Electron transfer, charge stabilization and charge recombination in naphthalenediimide-tryptophan immobilized on silica particles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 180, Issues 1–2, 15 May 2006, Pages 218–221
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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