A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 267
platinous nitrosodichlorodiamminohydrochloride, Pt(NHs)2CI2-NO-IICl, at the
temp, of boiling naphthalene until a soln. of the product in soda-lye gives no green
precipitate with hydrochloric acid. The greyish-yellow product is not attacked
by cold water, but it is attacked by hot -water. The soln. in boiling water deposits
on cooling platinous cis-dichlorodiammine, and hydrochloric acid added to the
nitrate precipitates platinic dichlorotetramminochloride. Silver nitrate removes
half the combined chlorine as silver chloride. The product may be a mixture of
cw?-[Pt(NH3)2Cl2] and [Pt(NH3)4Cl2]Cl2. L.. Tschugaeff and I. Tscherniaeff
prepared platinous dichlorohydroxydiammine, PtCl2( OH) (NH3) 2, by oxidizing
Peyrone's salt with ammonium persulphate ; by the cautious reduction of
PtCl2(OH)2(NHg)2 with zinc dust; or by heating a mixture of PtCl2(NH2)2 and
PtCl2(OH)2(NH3)2 with slightly acidulated water.
P. Klason 7 regarded trichloroamminoplatinous acid, H[Pt(NH3)Cl3J-H2O,
as the parent of a series of trichloroamminoplatinites. S. M. Jorgensen prepared
ammonium amminotrichloroplatinite, NH4[Pt(NH3)Cl3].H2O, by treating the
platinous tetramminochloride with ammonium chloroplatinite, filtering off the
platinous tetramminochloroplatinite, concentrating the soln. on a water-bath
until crystals of platinous cis-dichlorodiammine appear, and evaporating the
filtered soln. in the cold over cone, sulphuric acid. P. Klason obtained it by
heating platinous cwr-dichlorodiammine with JV-HCl on a water-bath, precipitating
the hydrochloroplatinous acid by adding the theoretical quantity of platinous
tetramminochloride, evaporating the soln. to dryness, in vacuo, and recrystallizing
the product from the aq. soln. According to S. M. Jorgensen, the salt furnishes
orange-red, rhombic bipyramidal crystals resembling those of the potassium salt.
They effloresce and slowly lose their water over cone, sulphuric acid ; they are
rehydrated over water, and dehydrated at 98°. The aq. soln. furnishes crystals
of platinous tetramminochloride, and of platinous trichloroammino-tetramminoplatinite,
[Pt(NH3)Cl3]2[Pt(NH3)4], and the reaction is almost quantitative. When
the salt is treated with mercaptan, P. Klason obtained platinous bissulphinoammine,
[Pt(NH3{(C2H5)2S}2]2 ; and also a derivative of platinous chlorosulpbinoammine,
namely, 4[Pt(NH3)Cl{(C2H5)2S}][Pt(NH3)Cl2]. The salt forms complexes :
I Pt(NH3)Cl3M Pt(NHg)4]; [Pt(NH3)Cl3MPt(C2H5NH2)4] : and [Pt(NH3)Cl3J2-
[Pt(C5H5N)41. H. Ley and K. Ficken prepared potassium dichloroalaninoplatinite,
K[Pt(C3H6O2N)Cl21, and also potassiumdicWoroglycineplatinite, K[( PtC2H4O2N)Cl2I.
A. Cossa prepared potassium ammmotrichloroplatinite, K[Pt(NH3)Cl3 ].H20,
by the action of ammonia on potassium chloroplatinite ; and by the action of
theoretical proportions of potassium chloroplatinite on [Pt(NH3)Cl3J2[Pt(NH3)4],
and separating the [Pt(NH3)4[PtCl4 simultaneously formed. The orange-red or
reddish-yellow crystals, according to S. M. Jorgensen, are rhombic bipyramids
with the axial ratios a : b : o—1-262O : 1 : 0-8231. There is no marked cleavage.
The optic axial angle 2K—64° ; the double refraction is negative ; and the indices
of refraction for Na-light are a=1*5438, and /2—1-5754. The pleochroism is :