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Spectrophotometric determination of rhenium using 2-pyridyl thiourea

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Abstract

The reagent 2-pyridyl thiourea produces a reddish brown complex with rhenium in hydrochloric acid medium in the presence of tin(II) chloride. The complex shows absorption maxima at 405 nm, obeys Beer's law for a range of 1–16 ppm of rhenium. The sensitivity and molar absorptivity is found to be 0.0115μg cm−2 and 1.603×104 1 mol−1 cm−1 respectively showing an improvement over other sulphur-nitrogen bearing ligands. Composition found by Job's and mole ratio method, indicates that the complex contains metal and reagent in the ratio 1∶2. Stability constant and stepwise formation constants of the complex have been evaluated by Harvey-Manning's method (logK overall=8.825), Leden's method (logK overall=8.3096), Rossotti-Rossotti's method (logK overall=8.653) and Yatsimirskii's method (logK overall=8.740). The relative error per 1% absolute photometric error is found to be 2.7%.

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Authors and Affiliations

  1. Department of Chemistry, Jadavpur University, 700 032, Calcutta, India

    Gayatri Dutta & Bimanesh Sur

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  1. Gayatri Dutta
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  2. Bimanesh Sur
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Dutta, G., Sur, B. Spectrophotometric determination of rhenium using 2-pyridyl thiourea. Mikrochim Acta 88, 359–369 (1986). https://doi.org/10.1007/BF01206730

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  • DOI: https://doi.org/10.1007/BF01206730

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