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Novel pH tunable fluorescent sensor with dual recognition mode

Paper ID Volume ID Publish Year Pages File Format Full-Text
27945 44051 2008 7 PDF Available
Title
Novel pH tunable fluorescent sensor with dual recognition mode
Abstract

A novel pH fluorescent chemosensor based on 2-hydroxybenzaldehyde 1-naphthoyl hydrazone (SNH) has been synthesized. This sensor has the ability to respond to both low and high pH values at different wavelengths. In acidic media, the fluorescence of SNH enhanced dramatically at shorter wavelength (λem = 380 nm, ϕf = 0.08) while in basic media the fluorescence at longer wavelength (λem = 500 nm, ϕf = 0.02) increased. At intermediate pH values (5–9), is detected the appearance of a weak emission at 460 nm, likely due to a keto-phototautomer associated to an intramolecular excited-state proton transfer. A complex mechanism tunable in the range of pH 1–11 with at least three fluorescent species at λem = 380, 460 and 500 nm is proposed.

Keywords
pH chemosensor; Photoinduced electron transfer; Excited-state intramolecular proton transfer
First Page Preview
Novel pH tunable fluorescent sensor with dual recognition mode
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 199, Issue 1, 5 September 2008, Pages 98–104
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering