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Synthesis and photophysical properties of fluorescence sensing ester- and amidoamine-functionalized 1,8-naphthalimides

Paper ID Volume ID Publish Year Pages File Format Full-Text
27768 44042 2008 10 PDF Available
Title
Synthesis and photophysical properties of fluorescence sensing ester- and amidoamine-functionalized 1,8-naphthalimides
Abstract

Novel ester- and amidoamine-functionalized 1,8-naphthalimides have been synthesized based on a convergent approach. Their basic photophysical properties in both protic and aprotic organic solvents of different polarity have been determined and discussed. Depending on the solvent polarity the fluorescence maxima are in the spectral range 480–550 nm, the fluorescence quantum yields vary from 0.23 to 0.46, the fluorescence lifetimes are long, in order of 9 ns. Absorption and fluorescence characteristics of the dyes as a function of pH were investigated in water/ethanol (4:1, v/v) solution. The starting 1,8-naphthalimide, containing primary amino receptor at the 1,8-naphthalimide 4-amino moiety, did not show significant changes in the emission properties as a function of pH. On the contrary the ester- and amidoamine-functionalized 1,8-naphthalimides were found to display sensitive fluorescence signal amplification over a wide pH scale, which has been ascribed to a photoinduced electron transfer from the tertiary amine receptor to the fluorophore 4-amino donor. From the changes in the fluorescence intensity pKa values of 4.42 and 4.86 for ester- and amidoamine-functionalized 1,8-naphthalimides, respectively were determined, making the synthesized compounds of potential use as pH chemosensing materials.

Keywords
1,8-Naphthalimide; Fluorescence; pH sensing; Photoinduced electron transfer (PET)
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Synthesis and photophysical properties of fluorescence sensing ester- and amidoamine-functionalized 1,8-naphthalimides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 193, Issues 2–3, 25 January 2008, Pages 129–138
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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