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Formation and Extraction of Niobium(V) Complex with Xylenol Orange in the Presence of a 4-Pyridone Derivative

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Abstract

Xylenol orange (XO) is a suitable reagent for the spectrophotometric determination of niobium in a weakly acidic medium. The present study shows that the addition of 3-hydroxy-2-methyl-1-phenyl-4-pyridone (HX) influences the complex formation as well as the spectroscopic properties of this colored system. To prevent formation of niobium(V) hydrolyzed species in water, tartaric acid was used when preparing the niobium stock solution. The red-violet colored complex formed by heating niobium(V) with xylenol orange (XO) in the presence of HX at pH=3 has a maximum absorption wavelength at 565 nm. The complex can be extracted by a chloroform solution of tetraphenylphosphonium (TPP) chloride. The optimum reaction conditions and other parameters for complex formation have been evaluated. The mechanism of extraction is probably based on the formation of the associated ion pair between the tetraphenylphosphonium cation and the mixed Nb(V)-XO-HX anion. The extracted complex in chloroform showed a maximum absorbance at 585 nm with the corresponding molar absorption coefficient being 3.72×104 L⋅mol−1⋅cm−1, and obeys Beer’s law in the range 3×10−6 to 3×10−5 mol⋅L−1.

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  1. Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000, Zagreb, Croatia

    A. Gojmerac Ivšić, N. Galić & V. Tomišić

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  1. A. Gojmerac Ivšić
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  2. N. Galić
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  3. V. Tomišić
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Correspondence to A. Gojmerac Ivšić.

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Gojmerac Ivšić, A., Galić, N. & Tomišić, V. Formation and Extraction of Niobium(V) Complex with Xylenol Orange in the Presence of a 4-Pyridone Derivative. J Solution Chem 38, 149–158 (2009). https://doi.org/10.1007/s10953-008-9363-2

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