Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received October 2, 2025
Revised November 19, 2025
Accepted November 23, 2025
Available online March 25, 2026
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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An Environmentally Applicable Thiourea-based Colorimetric Chemosensor for Monitoring ClO-
https://doi.org/10.1007/s11814-025-00613-y
Abstract
We developed a thiourea-based colorimetric chemosensor, NQH ( N -(naphthalen-1-yl)-2-(quinoline-2-yl)hydrazine1-carbothioamide),
that could selectively recognize ClO⁻. NQH responded to ClO⁻ through a desulfurization reaction,
resulting in a color change from colorless to yellow. Detection limit of NQH for ClO⁻ was 5.61 μM, and it functioned
eff ectively over a wide pH range (3–10). The probe NQH showed low interference when combined with other analytes.
NQH enabled practical detection in real water samples (tap, drinking, and river) and could be implemented in a test strip
and smartphone-based quantitative systems for on-site analysis. NQH showed reliable recoveries for ClO⁻ quantifi cation
in real water samples by using a smartphone-based spike-and-recovery method. The desulfurization reaction mechanism
for the colorimetric detection of ClO⁻ was elucidated using electrospray ionization mass spectrometry (ESI-MS), nuclear
magnetic resonance (NMR) titration, and density functional theory (DFT) calculations.
