Ammonium hexachloroplatinate IV

The PGM concentrate is attacked with aqua regia to dissolve gold, platinum, and palladium. The more insoluble metals, iridium, rhodium, mthenium, and osmium remain as a residue. Gold is recovered from the aqua regia solution either by reduction to the metallic form with ferrous salts or by solvent-extraction methods. The solution is then treated with ammonium chloride to produce a precipitate of ammonium hexachloroplatinate(IV),... 

When sulfur and Pt sponge are ignited, some pladnum(IIi sulfide is formed. The naturally occurring mineral is called coopente. When heated in air 01 IP. the products are metallic Pt and S. Platinum(IV) sulfide can be made by heating ammonium hexachloroplatinate(IV) or Ptand S at 650°C. When precipitated by H>S from chloroplatinic acid, the compound may exist as PtS2- H2S. 

Hexachloroplatinic(JV) acid (H2[PtCl6 ) yellow precipitate of ammonium hexachloroplatinate(IV)... 

Pfeiffer s application of Werner s theory to crystals and the advent of new experimental techniques led a number of scientists in various countries to use X-ray diffraction to determine crystal structures of coordination compounds. American chemist Ralph W. G. Wyckoff(l 897-1994) chose ammonium hexachloroplatinate(IV) as a crystal that should... 

Inasmuch as ammonium hexachloroplatinate(IV) is employed in the gravimetric determination of platinum and ammonium ion, its pyrolysis has been extensively studied decomposition begins at 185°, producing as intermediates cis- and irans-[Pt(NH3)2Cl2]. Ignition at higher temperatures yields spongy platinum ... 

In aqueous suspension, the ammonium ion in ammonium hexachloroplatinate(IV) is oxidized by chlorine ... 

The methods previously reported for the preparation of tetrachloroplatinic(II) acid1 and platinum(II) chloride are laborious and difficult to control. Platinum(II) chloride has been prepared by the thermal decomposition of ammonium hexachloroplatinate(IV)2 or of anhydrous platinum-(IV) chloride.3 According to a recent report,4 hydrazine sulfate is an effective reducing agent for the preparation of tetrachloroplatinate(II) salts from the corresponding hexachloroplatinate(IV) salts. This procedure has been extended to the preparation of aqueous tetrachloro-platinic(II) acid and solid platinum (II) chloride. 

The following procedure, modified from Gilchrist s method, is intended for the recovery of platinum from residues containing base metals and noble metals (other than those of the platinum group) as well as strong com-plexing agents. A preliminary separation of base metals as hydrated oxides considerably reduces the time required to obtain pme platinum by the precipitation of ammonium hexachloroplatinate(IV). The authors have tested the procedure both with actual laboratory residues and with syn-... 

Ammonium hexachloroplatinate CAS 16919-58-7 EINECS/ELINCS 240-973-0 Synonyms Ammonium chloroplatinate Ammonium hexachloroplatinate (IV) Ammonium platinic chloride Diammonium hexachloroplatinate (2-) Platinate (2-), hexachloro-, diammonium Platinic ammonium chloride Platinic sal ammoniac Platinum ammonium chloride Quaternium-17 Empirical H8ClsN2Pt Formula (NH4)2PtCl6... 

Ammonium hexachloroplatinate (IV). See Ammonium hexachloroplatinate Ammonium, hexadecyl (2-hydroxyethyl) dimethyl-, chloride. See Hydroxyethyl cetyidimonium chloride... 

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