A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 253
and L. T. Bourland found the susceptibility to be independent of temp. D. M. Bose
and H. G. Bhar also studied the magnetic properties.
V. Ipateeff and A. Andreevsky observed that hydrogen, at elevated temp, and
press., acting on 3 to 30 per cent. soln. of platinous chloride, precipitates the platinum,
and the proportion of platinum precipitated is the greater, the greater is the initial
cone, of the soln. The addition of acids, and of ferric chloride inhibits the reaction,
but without affecting the influence of the other factors. With 0-01 to 1 per cent,
soln., in the presence of iron and nickel salts, the reduction is complicated and slow,
particularly if mineral acids are present. W. J. Russell found that hydrogen precipitates
the metal from platinum salts at ordinary temp, and press. J. J. Berzelius
said that the greenish-grey powder behaves like a fatty substance in that it is
scarcely wetted by water ; and that the salt is not affected by water ; G. Magnus
also noted that the brown powder is insoluble in "water, but is soluble in the motherliquor.
E. Knoevenagal and E. Ebler observed that no precipitate is formed with
hydrogen dioxide. J. J. Berzelius, and G. Magnus noted that the salt is soluble
in hot hydrochloric acid, and, "with access of air, some hydrochloroplatinic acid
is formed—L. F. Nilson added that some hydrochloroplatinic acid may be
formed with the separation of platinum—vide infra. Potassium iodide colours
soln. of platinous salts a dark reddish-brown, and after a time the soln. is
decolorized as a precipitate of platinous iodide is formed. O. Stelling estimated
platinum by the potentiometric titration of platinous salts with a OliV-soln. of
potassium bromate. H. Rose observed that hydrogen sulphide, and ammonium
sulphide give a brown soln. with a hydrochloric acid soln. of platinous chloride,
and later platinous sulphide is precipitated, and the precipitate dissolves in a large
excess of ammonium sulphide. J. J. Berzelius observed that the dichloride is not
changed by sulphuric acid or by nitric acid ; and that boiling aqua regia converts
it into hydrochloroplatinic acid. H. Rose observed that stannous chloride colours
soln. of platinous salts reddish-brown without forming a precipitate. P. Schottlander
found that a soln. of ammonium chloroplatinite and sodium thiosulphate
furnish platinous thiosulphate, as a white precipitate, when treated with alcohol.
W. Peters observed that in an atm. of ammonia, additive compounds are formed—
vide infra—M. Delepine noted that an ammine is precipitated -when ammonia is
added to the aq. soln. H. Rose observed no precipitate is formed by addition of a
soln. of sodium phosphate. G. Gore said that platinous chloride is insoluble in
liquid ammonia, and E. Divers, that it is insoluble in an ammonia soln. of ammonium
nitrate. P. Schutzenberger prepared the compounds with carbon monoxide
indicated below, and the results were confirmed by W. Manchot. W. Manchot
and E. Enk found that at 140°, platinum dichloride and tetrachloride with carbon
monoxide form platinum dicarbonyldichloride, PtCl2(CO)2 ; and W. Manchot
and G. Lehmann observed that the carbonyl, 2PtCl2.3CO, is also formed.
P. Schutzenberger and C. Fontaine, and A.Rosenheim and W. Lowenstamm prepared
from phosphorus trichloride the complex platinous dichlorobisphosphorotrichloride,
[Pt(PCIa)2Cl2], and platinous dichlorobisphosphorotrihydroxde, [Pt(P(OH)3}2C12] ;
platinous dichlorophosphorotrihydroxide, [Pt(P(OH)3)Cl2], platinous chlorophosphorotrihydroxidodihydrophosphite,
[Pt(P(OH)3)Cl(H2PO3)], and P. Schutzenberger,
platinous dichlorosilverphosphite, [Pt(P(OAg)3)2Cl2J. P. Schutzenberger,
P. Schutzenberger and C. Fontaine, E. Baudrimont, A. Werner, G. Quesneville,
A. Rosenheim and W. Lowenstamm, A. Rosenheim and W. Levy, and D. Cochin
described platinous dichlorophosphorotrichloride, [Pt(PCl3)Cl2J2, and platinous
dichlorophosphorotrichloroplatinite, [Pt(PCl3)Cl2]2.PtCl2.
H. Rose observed that mercuric cyanide does not react immediately with soln.
of platinous chloride ; nor has potassium ferrocyanide or ferricyanide any action.
M. S. Kharasch and T. A. Ashford prepared complex salts with ethylene.
K. A. Hofmann and H. Kirmreuther found that the ethylene halides gradually
reduce soln. of platinous chloride. L. Tschugaeff observed that when platinous
chloride is heated On a water-bath, the tertiary amines precipitate platinum.