A Comprehensive Treatise on Inorganic and Theoretical Chemistry

384 INORGANIC AND THEORETICAL CHEMISTRY
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§ 25. Platinous Iodide
G. van Praagh and E. K. Rideal * assumed that platinum subiodide, or platinum
monoiodide, PtT, is formed when iodine attacks platinum at a high temp.—vide
supra, the action of iodine on platinum. J. L. Lassaigne prepared platinous iodide,
or platinum diiodide, PtI2, by warming platinous chloride with an aq. soln. of
potassium iodide for 15 minutes, and drying the washed product. G. Clementi
found it difficult to prepare this salt. H. Topsoe added that if the digestion is too
short, the metathesis is incomplete, and if too long, some platinous iodide is converted
into platinum and platinic iodide. W. Peters recommended treating platinous
iodide with hydriodic acid of sp. gr. 1 *96, and drying the product at 100° ; and
L. Ramberg, dissolving a mol. of potassium chloroplatinite in about 5 times its
weight of boiling water, and adding 2 mols. of potassium iodide in a (1 : 4)-soln.,
warming the mixture twice on a water-bath for a short time, allowing the soln. to
stand over night, washing the product with water, and drying at 90°.
The soft black powder, said J. L. Lassaigne, sticks to the fingers like lampblack
; it is tasteless, odourless, and stable in air. R. Klement gave 6*403 for the
sp. gr. at 25°/4°, and 70*1 for the mol. vol. When heated to the b.p. of mercury,
it gives off iodine, and leaves spongy platinum behind. Water, and cold hydrochloric
acid have no action on the salt ; cold, aq. hydriodic acid, of sp. gr. 1-038,
acts on it forming platinum and platinic iodide which passes into soln. ; a hot,
aq. soln. of potassium iodide acts similarly, but the greater part of the platinous
iodide remains undecomposed. Cone, sulphuric and nitric acids have no action on
the salt. When digested with aq. ammonia, a dark yellowish-green powder is
formed, which, when heated, gives off water, ammonium iodide, and ammonia.
W. Peters said that the salt absorbs dry ammonia—vide infra. J. Li. Lassaigne
found that alcohol has no action on platinous iodide, when the salt is digested with
potash lye or soda lye, part of the platinous oxide which is formed separates as a
black powder, and part passes into soln.
W. Peters obtained orange-red platinous hexamminoiodide, PtI2.6NH8, by