Abstract
This work presents the development of a quinoxaline and rhodamine conjugate system that acts as a colorimetric chemosensor for hydrogen sulfate (HSO4−) ions in methanol media. This sensor has been characterized both theoretically and experimentally. The detection limits for HSO4− are small as 0.71 µM and 3.8 µM for the absorption and emission experiments, respectively. The effectiveness of the probe in recognizing HSO4− both in gel and solid phase is evaluated as well. Thus, this works presents a simple strategy to detect the environmental HSO4− pollutant event at tiny concentrations.
Highlights
The exponential increase of environmental pollution has forced researchers to rethink the modes of identification of the hazards through quick yet accurate methods [1,2]
It is notable that HSO4− dissociates at high pH to generate toxic sulfate (SO24− ), which can cause skin and eye irritations and even respiratory paralysis or other severe disorders [24,25,26,27,28,29]
The resulting product is fully characterized by FTIR, 1H, 13C NMR, ESI−MS
Summary
The exponential increase of environmental pollution has forced researchers to rethink the modes of identification of the hazards through quick yet accurate methods [1,2]. In this framework, the emergence of fluorescent/colorimetric chemosensors for cations/anions/. Among the various anions that need to be detected, hydrogen sulfate (HSO4− ). Accurate and easy detection of HSO4− is essential to monitor and control several hazardous effects. Colorimetric detection is one of the most preferable alternatives as it allows an easy and rapid detection by the naked eye without any expensive instruments. QRH, selective detection of the anion in methanol.
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