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A highly selective, colorimetric, and environment-sensitive optical potassium ion sensor

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Abstract

Potassium ions (K+) play vital roles in many biological processes and thus highly selective sensors for K+ are critical for disease diagnosis and health monitoring. Herein, we report a colorimetric K+ sensor (KS7) in which a hemicyanine dye was used as a fluorophore and phenylaza-[18]crown-6 lariat ether (ACLE) was utilized as a K+ ligand. The maximum absorption peak of KS7 shifted hypsochromically by 77 nm (from 515 to 438 nm) with an isosbestic point at 452 nm upon the addition of K+ to its aqueous solution accompanied by a color change from red to yellow. This sensor exhibited a linear response range to K+ from 1 to 200 mM, indicating its wide detection range for cellular, urinary, and environmental potassium ions. Further, this sensor is solvent-sensitive, implying its environmental sensitivity. For the demonstration of its applications, we prepared filter paper-based K+ test strips, which were used to detect K+ in urine conveniently.

Graphical abstract: A highly selective, colorimetric, and environment-sensitive optical potassium ion sensor

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Publication details

The article was received on 22 Jan 2017, accepted on 10 Apr 2017 and first published on 10 Apr 2017


Article type: Communication
DOI: 10.1039/C7CC00598A
Citation: Chem. Commun., 2017, Advance Article
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    A highly selective, colorimetric, and environment-sensitive optical potassium ion sensor

    G. Song, R. Sun, J. Du, M. Chen and Y. Tian, Chem. Commun., 2017, Advance Article , DOI: 10.1039/C7CC00598A

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