Abstract
The distribution of complexes of type [Pt(SnCl 3) n Cl 4− n ] 2− ( n = 1–4) and [Pt(SnCl 3) 5] 3− between 1.5–3.5 M hydrochloric acid and 4-methyl-2-pentanone is discussed in detail. Platinum can be quantitatively extracted into the organic phase from hydrochloric acid solutions containing tin(II) chloride when the mole ratio Sn 2+: Pt 2+ > 5. In the presence of sufficient tin(II) chloride, the [Pt(SnCl 3) 5] 3− anion is the predominant species extracted into the organic phase. Similar results pertain to starting solutions of either Ptcl 2− 4 or PtCl 2− 6, although Pt 4+ is rapidly reduced to Pt 2+. Small amounts of Co 2+, Ni 2+, Fe 3+ and Cu 2+ do not interfere.
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