The effect of tin(II) chloride on the liquid-liquid extraction of tetrachloroplatinate(II) ions by triphenylphosphine in dichloromethane |
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Authors: | Klaus R. Koch Janet E. Yates |
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Affiliation: | Department of Analytical Science, University of Cape Town, Private Bag, Rondebosch 7700 South Africa |
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Abstract: | The effect of tin(II) chloride on the extraction of tetrachloroplatinate(II) in 1.0–1.5 M HCl into dichloromethane with triphenylphosphine (TPP) is described. Tin(II) chloride dramatically increases the rate and efficiency of platinum extraction. The percentage of platinum extracted depends in a complicated way on the time allowed for extraction, the Pt:Sn(II) ratio, the Pt:TPP ratio, and to a lesser extent to the hydrochloric acid concentration. Tin is initially extracted into the organic phase, probably as [Pt(SnCl3)Cl(PPh3)2], but is subsequently back-extracted into the aqueous phase, as a result of the relatively slow disproportionation reaction: [Pt(SnCl3)Cl(PPh3)2]org + cl? ? [Pt(PPh3)2Cl2]org + SnCl?3. |
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