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Bis-thiosemicarbazone functions as a selective chemosensor with the lowest LOD for Hg ions in water-rich medium: implications for on-site detection and logic gate experiments
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DOI：10.1039/D6RA02561G.png)
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Abstract
En 中文
In this investigation; a mesitylene-anchored bis-thiosemicarbazone (TOMH); with the potential to chelate a metal ion via S; S donor atoms; was used as a chemosensor for the selective detection of mercury ions in an aqueous medium from mixtures with several metal ions (Ag; Al; Ba; Bi; Ca; Cd; Co; Cr; Cs; Cu; Fe; K; Li; Mg; Mn; Na; Ni; Pb; Th; and Zr). Electronic absorption spectroscopy revealed the composition of the identified species to be Hg(S; S-TOMH)·(NO3)2 (TOMHN). The spectroscopic (1H NMR; 13C NMR; and FT-IR); theoretical (DFT and TD-DFT) and structural techniques confirmed the bonding of TOMH to Hg through S donor atoms (Hg–S: 2.484–2.490 Å and S–Hg–S bond angle: 160.1°); while the nitrates are non-bonded. The TOMH chemosensor has the lowest limit of detection (LOD: 10.97 nM) for Hg ions in a water-rich medium (90% H2O : 10% DMSO) among thiosemicarbazones or closely related S donor chemosensors. It exhibits multiple applications; such as on-site detection of Hg using filter paper strips; formation of TOMH–Hg–EDTA-supported INHIBIT logic gate; and enhanced antimicrobial activity of TOMHN relative to TOMH or Hg(NO3)2 alone.
Keywords:
mercury detection
thiosemicarbazone
chemosensor
water-rich medium
LOD
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