A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 389
colours the salt orange-yellow, but little or no ammonia is evolved ; and acids
yield a black product. P. T. Cleve obtained platinic diiodohexammino-Yz-diimidoiodide,
[I(NH3)3Pt(NH)2Pt(NH3)3lJI2.H20, by boiling platinic diiodotetramminoiodide
with aq. ammonia. The chrome-yellow, rhombic plates furnish silver iodide
when treated "with, silver nitrate ; and nitric acid forms iodonitroxyltetramminonitrate.
S. M. Jorgensen obtained platinic cis-tetraiododiammine, by the action
of potassium iodide on the cis-tetrachlorodiammine. The crystals resemble those
of iodine. P. T. Cleve reported platinic hexaiododiammine, [Pt(NHg)2I4(I2) J, to
be formed by the action of a hot tincture of iodine on the cis-tetraiodotetrammine.
The black powder consists of hexagonal dark purple-red plates. Alkali lye colours
the salt brown, then cinnabar-red, and when heated, ammonia is evolved and the
colour becomes yellow. L. A. Tschugaeff and co-workers prepared platinic hydrazinocarbylaminoiodide.
W. J. Pope and S. J. Peachey described platinic iodotrimethylaminodiammine, [Pt(NH3)j-
(CHa)3NI]; F". G. Mann and W. J. Pope reported platinic dichloro-/S/S /S -triaminotriethylamino-
Iodide, Ll*t]sr(C2H4.]Srn2)3Cl2lI2. R. L. IDatta, platinic bismethylaminehydroiodide, 2CH3NH2.-
HT.PtI4; platinic bisdlmethylaminehydroiodide, 2(CH3)2NH.HT.PtI4; platinic bistrimethylaminehydroiodide,
2(CH3J3N.HLPtI4 ; platinic bistetramethylammoniumiodide, 2(CHg)4NLlHl4;
platinic bisethylaminehydroiodide, 2C2H5NH2.HLPtI4 ; platinic bi sd i ethyl am inehydroiodide,
2(C2HB)2NH.HI.PtT4 ; platinic bistriethylaminehydroiodide, 2(C2H5)3N.HLPtl4 ; platinic bistetraethylammoniumiodide,
2(CaHB)4NLPtT4; platinic bisdipropylaminehydroiodide, 2(C3H 7)2-
NH.HLPtT4 ; and platinic bistetrapropylammoniumiodide, 2(C3H7J4NLPtI4 ; R. IJ. Datta and
T. Ghosh, platinic methylethylpropylphenylammoniumlodide, (CH3)(C2H5)(C3H7)(C0H6)ISIl.
PtI4. A. P. Smirnoff prepared platinic trispropylenediaminoiodide, | Pt(C3He.N2H4)3]I4, in
its racemio, clextro- and laevo-forms. R. L. Datta obtained platinic bisallylaminehydroiodide,
2C3H5NH2-HLPtI4 ; platinic bisanilinehydroiodide, 2C6H6NH ,.HLPtI4 ; and platinic
blspyridinehydroiodide, 2(C5H5N).HLPtI4 ; S. O. Hedin described platinic tetraiodobispyridine,
LPt(C5H5N)2I4J ; S. M. Jorgensen, platinic diiodobispyridinediamminoiodide, LPt(NH3)..-
(C5H5N)2I2]I2, by the action of an excess of a soln. of iodine and potassium iodide on
platinoiis bispyridinediamiriinoohlorido in two forms according as the cis- or trans-platinous
salt is omjiloyod. R. L. Datta, prepared platinic bis-a-picolinehydroiodide, 2C6H7-N.HLPtI4 ;
R. L. Datta and T. Uhosh, platinic bispiperidinehydroiodide, 2C5H11N-HLPtT4 ; and platinic
bisquinol inehydroiodide, 2C9H7N. HLPtI4, with ordinary and iso-qmnolin«. C Wallin
reported platinic tetraiodobisamidoacetate, [Pt(NH2CH2COOH)2I4J ; and platinic diiodobisglycine,
Lrt(NH2.CH2.COO)2I2J.
C. Enobusko described platinic tetraiodobismethylsulphine, LPtI(CH3)aS}gT4l; R. L. Datta,
platinic bistrimethylsulphoniumiodide, 2(CH3)3SLPtI4 ; C. W. Bomatrand, and C Rutlohus,
platinic tetraiodobisethylsulphine, ri*M(C2H5)2S}2L,l; R. L. Datta, platinic bistriethylsulphoniumiodide,
2(C2H5J3SLPtI4; C. Rudelius, and M. Weibiill. platinic tetraiodobis-ipropylsulphine,
[Pt{(C3H7)2S}2I4] ; H. Londahl, platinic tetraiodobis-i-butylsulphineiodide,
[Pt{(C4H9)2S)2I4]l2 ; J. Petren, platinic tetraiodobisethylselenine, IPtI(C2HJ2NeJ2T4I; and
platinic tetraiodoethylselenine, [Pt{(C2H5)2}{(C2H5)2Se}l4j.
According to J. L. Lassaigne, cold, dil. hydriodic acid in contact with platinic
iodide for, say, 24 hrs., forms a red soln. which when evaporated in vacuo, or over
lime yields crystals of hydriodoplatinic acid, H2PtT6.9H2O. J. TJ. Lassaigne thought
that the crystals were anhydrous, but H. Topsoe showed that the solid so formed
is the enneahydrate. J. L. Lassaigne said that the reddish black, deliquescent,
acicular crystals are odourless, and have an astringent, somewhat acidic, taste.
H. Topsoe showed that the six-sided plates are monoclinic, and show twinning.
The faces of the crystals lose their metallic lustre when exposed to air, and acquire
a black film of platinic iodide owing to the loss of hydrogen iodide. J. L. Lassaigne
found that in a dry vacuum, the crystals evolve a little hydrogen iodide, and more
so at 100° ; at a higher temp., hydrogen iodide and iodine are evolved and platinum
remains. The compound is freely soluble in water, and when the wine-red soln. is
diluted with a large proportion of water, platinic iodide is deposited, and more
quickly if the aq. soln. be exposed to sunlight, or, according to H. Topsoe, if heated.
J. Li. Lassaigne said that chlorine decomposes the aq. soln. with the deposition of
iodine, and platinic iodide ; and alkali lye forms alkali iodides. Hydriodoplatinic
acid forms a series of salts, the iodoplatinates. H. I. Schlesinger and R. E. Palmateer
discussed the relative stability of the halogenoplatinates.