A New Spectrophotometric Reagent for Fe(III): 2-(2,3-Dihydroxy-4-oxocyclobut-2-enylidene) Hydrozinecarbothiamide and Its Application in Real Samples

<table>Determination of the stoichiometry of Fe(III)-ligand complex by the Job method of continuous variations: <svg height="16.5375" id="M15" style="vertical-align:-4.68874pt" version="1.1" viewbox="0 0 40.287498 16.5375" width="40.287498" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,16.5375)">
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<tspan style="font-size: 8.75px; " x="0" y="0">F</tspan>
<tspan style="font-size: 8.75px; " x="4.8311038" y="0">e</tspan>
</text>
<text transform="matrix(1,0,0,-1,-54.89,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">(</tspan>
</text>
<text transform="matrix(1,0,0,-1,-51.98,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">I</tspan>
<tspan style="font-size: 8.75px; " x="2.9144161" y="0">I</tspan>
<tspan style="font-size: 8.75px; " x="5.8288321" y="0">I</tspan>
</text>
<text transform="matrix(1,0,0,-1,-43.24,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">)</tspan>
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</g>
</g>
</svg> = <svg height="14.6" id="M16" style="vertical-align:-3.13504pt" version="1.1" viewbox="0 0 18.9125 14.6" width="18.9125" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.6)">
<g transform="translate(72,-60.32)">
<text transform="matrix(1,0,0,-1,-71.95,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">C</tspan>
</text>
<text transform="matrix(1,0,0,-1,-63.61,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">𝐿</tspan>
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</g>
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</svg> = 10<sup>−4</sup> M; pH = 3; <svg height="10.325" id="M17" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 9.0375004 10.325" width="9.0375004" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.325)">
<g transform="translate(72,-63.74)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝐼</tspan>
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</svg> = 0.02.</table>

Journal of Chemistry

fig6

Figure 6

Figure 6: A New Spectrophotometric Reagent for Fe(III): 2-(2,3-Dihydroxy-4-oxocyclobut-2-enylidene) Hydrozinecarbothiamide and Its Application in Real Samples 

Figure 6 | A New Spectrophotometric Reagent for Fe(III): 2-(2,3-Dihydroxy-4-oxocyclobut-2-enylidene) Hydrozinecarbothiamide and Its Application in Real Samples 