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[4] If excess acids are removed, PtCl 4 crystallizes from aqueous solutions in large red crystals of pentahydrate PtCl 4 ·5(H 2 O), [5] which can be dehydrated by heating to about 300 °C in a current of dry chlorine. The pentahydrate is stable and is used as the commercial form of PtCl 4. Treatment of PtCl 4 with aqueous base gives the [Pt(OH ...
PtCl 4 2− + 2 PPh 3 → cis-PtCl 2 (PPh 3) 2 + 2 Cl −. The anti-cancer drug Cisplatin can similarly be prepared: [1] PtCl 4 2− + 2 NH 3 → cis-PtCl 2 (NH 3) 2 + 2 Cl −. Enedithiolates displace all four chloride ligands to give bis complexes. [3] Reduction gives colloidal platinum of potential interest for catalysis. [4]
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Chloropentammineplatinum chloride is an inorganic compound with the formula [PtCl(NH 3) 5]Cl 3. It is a chloride salt of the coordination complex [PtCl(NH 3) 5] +. It is a white, water soluble solid. The compound is prepared by treating potassium hexachloroplatinate with aqueous ammonia: [1] K 2 PtCl 6 + 5 NH 3 → [PtCl(NH 3) 5]Cl 3 + 2 KCl
Ammonium hexachloroplatinate is used in platinum plating. Heating (NH 4) 2 [PtCl 6] under a stream of hydrogen at 200 °C produces platinum sponge. Treating this with chlorine gives H 2 [PtCl 6]. [2] Ammonium hexachloroplatinate decomposes to yield platinum sponge when heated to high temperatures: [2] [5] 3(NH 4) 2 PtCl 6 → 3Pt(s) + 2NH 4 Cl ...
Pt 4+ (aq) + 6 Cl − (aq) → [PtCl 6] 2− (aq) Experimental evidence reveals that the reaction of platinum with aqua regia is considerably more complex. The initial reactions produce a mixture of chloroplatinous acid (H 2 [PtCl 4]) and nitrosoplatinic chloride ([NO] 2 [PtCl 4]). The nitrosoplatinic chloride is a solid product.
Magnus's green salt is the inorganic compound with the formula [Pt(NH 3) 4][PtCl 4]. This salt is named after Heinrich Gustav Magnus, who, in the early 1830s, first reported the compound. The compound is a linear chain compound, consisting of a chain of platinum atoms. It is dark green, which is unusual for platinum compounds.
PtCl 4 → PtCl 2 + Cl 2. Transformations such as this are "driven" by entropy, the free energy gained upon the release of a gaseous product from a solid. Upon heating to still higher temperatures, PtCl 2 releases more chlorine to give metallic Pt. This conversion is the basis of the gravimetric assay of the purity of the PtCl 2 product.