A Comprehensive Treatise on Inorganic and Theoretical Chemistry

392 INORGANIC AND THEORETICAL CHEMISTRY
iodide, RI2[Pt(NHa)4(OH)I]I2 ; and L. A. Tschugaeff, platinic diiodotetramminoiodide,
[Pt(NH3)4I2]I2.
W. J. Pope and S. J. Peachey prepared trimethyl platinic iodide, (CHs)8PtI,
by the action of Grignard's reagent—magnesium methyliodide—on hydrochloroplatinic
acid : PtCl4+3(CH3)MgI=(CH3)3PtI+2MgCl2-bMgI2. When heated
with a mixture of benzene, alcohol, and cone, ammonia, it forms trimethyl platinic
diamminoiodide, Pt(CH3)(NHg)2I.
Several mixed halides have been reported. H. Kammerer dissolved platinum
with 4 gram-atoms of iodine in aqua regia, evaporated the soln. on a water-bath
and allowed it to cool over sulphuric acid ; the brick-red, deliquescent prisms of
platinic dichlorodiiodide, PtCl2I2, which are formed melt below 100°. Potassium
or ammonium chloride precipitates the chloroplatinate whilst iodides remain in
soln. ; potassium iodide colours the soln. deep red ; and iodine chloride forms
platinic chloride and iodine. W. W. Mather reported platinic chlorotriiodide,
PtClI3, to be formed by evaporating to dryness a mixture of hydrochloroplatinic
acid and hydriodic acid, and heating the residue to 149° when hydrogen chloride
and iodide, and iodine chloride escape. H. Topsoe added that if too large an excess
of hydriodic acid is employed some hydroiodoplatinous acid is formed. The black
powder gives off iodine and iodine chloride when heated between 205° and 315°, and
spongy platinum remains. The salt is insoluble in water, and behaves towards
sulphur dioxide, alkali sulphites, and ammonia like platinic iodide ; it is sparingly
soluble in alcohol, and forms a red soln. with potash lye, from which sulphuric
acid precipitates the chlorotriiodide unchanged. P. T. Cleve, and O. Carlgren and
P. T. Cleve prepared platinic chloroiodotetramminochloride, LPt(NH3)4ClIJCl2,
by the action of hydrochloric acid on the nitrate or sulphate of the diiodohexammino-
/x-diamine.
C. Enebuske prepared platinic dichlorodiiodobismethylsulphine, [Pt{(CH3)2S}2-
Cl2I2J ; H. Londahl, platinic dichlorodiiodobisbutylsulphine, LPt{(C4H9)2S}2Cl2I21,
with iso- and secondary butyl; J. Petren, platinic dichlorodiiodobisethylselenine,
[Pt{(C2H5)2Se}2Cl2I2], and platinic chlorotriiodobisethylselenine, [Pt{(CaH5)2Se}2-
ClI31 ; and A. Cahours and H. Gal, platinic dicMorodiiodobisethylphosphine,
[Pt{P(C2H5)3>2Cl2T2J.
The platinic bromoiodides are represented by platinic dibromodiiodomethylsulphine,
[Pt{(CH3)2S}2Br2I2 ], prepared by C. Enebuske ; J. Petren
described platinic tribromoiodobisethylselenine, [Pt{(C2H5)2Se}2Br3IJ, platinic
dibromodiiododiethylselenine, LPt{(C2H5)2Se}2Br2I2], platinic bromotriiododiethylselenine,
LJM(C2Hs)2Se)2BrI31, platinic dibromodiiododiethylsulphinodi
ethylselenine, tPt{(C2H6)2S}{(C2H5)2Se>Br2I2J ; and G. Wallin, platinic dibromodiiodobisamidoacetate,
[Pt(NH2.CH2.COOH)0Br2L>J. J. Petren i>repared platinic
diiododinitritoethylsulphinoethylselenine, LPt{(C2H5)2S}{(C2H5)2Se}(N02)2I2].
REFERENCES.
1 E. H. Archibald and W. A. Patrick, Journ. Amer. Chem. Soc, 34. 369, 1912 ; I. Bellucci,
Oazz. Chim. Ital., 33. i, 147, 1893 ; AUi Accad. Lincei, (5), 11. i, 8, 1902 ; W. Biltz, Zeit. anorg.
Chem., 115. 241, 1921 ; C. W. Blomstrand, Journ. prakt. Chem., (2), 38. 357, 1888 ; C. H. D. Boedeker,
Die Jieziehungen zunachen Dichte und Zusammenaetzung bei /eaten und liquidert Stoffen,
Leipzig, 1860 ; A. Cahotirs and H. Gal, Compt. Bend., 70. 902, 187O ; O. Carlgren and P. T. Cleve,
Zeit. anorg, Chem., 1. 68, 1892 ; G. Clementi, Nuovo Cimento, (2), 2. 192, 1855 ; P. T. Cleve,
Svenska A lead. HandL, 7. 7, 1868 ; 10. 9, 1872 ; R. Iu. Datta, Journ. Chem. Soc., 103. 427, 1913 ;
Journ. Amer. Chem. Soc., 35. 1187, 1913; R. L. Datta and T. Ghosh, ib„ 86. 1019, 1914;
H. D. K. Drew, F. W. Pinkard, W. Wardlaw and E. G. Cox, Journ. Chem. Soc., 988, 1932 ;
C. Enebuske, Journ. prakt. Chem., (2), 38. 365, 1888 ; Lunda Arsakr., (2), 22. 37, 1887 ; F. Field,
Chem. News, 43. 75, 18O, 1881 ; S. G. Hedin, Om Pyridinena Plotinbaaer, Lund, 1886 ; Acta
Univ. Lund, (2), 22. 3, 1887 ; E. Herlinger, Zeit. Kriat., 62. 154, 1925 ; P. Jez, Journ. Phya.
Rod., (6), 8. 244, 1927 ; Compt. Rend. Polonaise Soc. Phya., 7. 21, 1926 ; S. M. Jorgensen, Journ.
prakt. Chem., (2), 16. 355, 1877 ; (2), 33. 507, 1886 ; H. Kammerer, Liebig'a Ann., 148. 329,1868;
R. J. Kane, Phil. Trana., 142. 299, 1842 ; Dublin Journ. Med. Chem., (3), 211, 1833 ; Journ. Chim.
Med., (J), 9. 26, 1833 ; R. Klement, Zeit. anorg. Chem., 164. 195, 1927 ; A. R. Klien, Ueber die