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<p>Naked eye optical chemosensors have gained considerable attraction by researchers due to their low cost, selectivity, sensitivity and rapid on the spot detection properties. In this work, a Schiff base “4-(4-(dimethylamino)benzylidene)amino-1,5-dimethyl-2-phenyl-3H-pyrazol-3-one” (DMAB-AAP) was studied for its visual sensing properties to detect heavy metals ions however, it shows discriminating color changes from colorless to lemon yellow and greenish yellow for ferrous (Fe<sup>2+</sup>) and lanthanum (La<sup>3+</sup>) ions, which is consistent to red shift from 362&#xa0;nm to 421&#xa0;nm and 438&#xa0;nm having limit of detection <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:8.201\times\:{10}^{-7}\)</EquationSource> </InlineEquation> M and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:4.911\times\:{10}^{-7}\)</EquationSource> </InlineEquation> M, respectively, in the UV–Vis. absorption spectrum of DMAB-AAP. Moreover, stoichiometric binding of DMAB-AAP with Fe<sup>2+</sup> and La<sup>3+</sup> was found to be in 1:1 ratio. The LOD of DMAB-AAP for ferrous ions is significantly lower than WHO tolerable limits (5µM) in drinking water. Importantly, as no other Schiff base has been reported for colorimetric sensing of lanthanum, therefore, the LOD of DMAB-AAP for lanthanum ions is found comparable with various electrochemical methods.</p> Graphical Abstract <p></p>

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Efficient Colorimetric Naked-Eye Detection of Lanthanum (La3+) and Ferrous (Fe2+) Ions Using Pyrazole-Based Schiff Base

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Hafiz Muhammad Junaid,
  • Madeeha Batool

摘要

Naked eye optical chemosensors have gained considerable attraction by researchers due to their low cost, selectivity, sensitivity and rapid on the spot detection properties. In this work, a Schiff base “4-(4-(dimethylamino)benzylidene)amino-1,5-dimethyl-2-phenyl-3H-pyrazol-3-one” (DMAB-AAP) was studied for its visual sensing properties to detect heavy metals ions however, it shows discriminating color changes from colorless to lemon yellow and greenish yellow for ferrous (Fe2+) and lanthanum (La3+) ions, which is consistent to red shift from 362 nm to 421 nm and 438 nm having limit of detection \(\:8.201\times\:{10}^{-7}\) M and \(\:4.911\times\:{10}^{-7}\) M, respectively, in the UV–Vis. absorption spectrum of DMAB-AAP. Moreover, stoichiometric binding of DMAB-AAP with Fe2+ and La3+ was found to be in 1:1 ratio. The LOD of DMAB-AAP for ferrous ions is significantly lower than WHO tolerable limits (5µM) in drinking water. Importantly, as no other Schiff base has been reported for colorimetric sensing of lanthanum, therefore, the LOD of DMAB-AAP for lanthanum ions is found comparable with various electrochemical methods.

Graphical Abstract