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Updated: May 6, 2026

Dynamic Electrochemical Measurement of Chloride Ions
Published on: February 5, 2016
Colorimetric and luminescent sensors for chloride: hydrogen bonding vs deprotonation
Robert B P Elmes1, Peter Turner, Katrina A Jolliffe
1School of Chemistry (F11), The University of Sydney , NSW 2006, Australia.
Abstract:
The synthesis and photophysical properties of four squaramide based fluorescent anion sensors (1-4) are described. These luminescent compounds showed selectivity for Cl(-) over various other anions with concomitant changes in both their UV/visible and fluorescence properties upon Cl(-) addition, attributed to initial H-bonding followed by NH deprotonation in the presence of excess Cl(-), signaled by a color change. The nature of the electron withdrawing aryl substituents is directly related to the H-bonding ability/acidity of the squaramide protons and can be used to tune the deprotonation behavior.
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