Volume 25, Issue 6 pp. 778-783
Full Paper

Naphthalimide as Highly Selective Fluorescent Sensor for Ag+ Ions

Sheng Xu

Sheng Xu

Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, China

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Wei Li

Wei Li

Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, China

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Kong-Chang Chen

Kong-Chang Chen

Tel.: 0086-021-64252288; Fax: 0086-021-64252288

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First published: 14 June 2007
Citations: 17

Abstract

The naphthalimide derivative NA1 was synthesized, which consists of a bis(2-(ethylthio)ethyl)amine group binding cations and naphthalimide unit as chromogenic and fluorogenic signaling subunit. Absorption and emission spectra and the effect of polarity of solvents and pH values were studied. The photo-induced electron transfer (PET) occurred from the donor of bis(2-(ethylthio)ethyl)amine group to the naphthalimide fluorophore. The present study demonstrates that NA1 is a viable candidate as a fluorescent receptor for a new Ag+ ion sensor. This silver ion chemosensor can discriminate Ag+ ion well among heavy metal ions by an enhancement of the fluorescence intensity in ethanol-water (1:9, V:V). And NA1 is also a pH-sensor because the fluorescence of the compound varies with the pH values.

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