ON AMMONIACAL PLATINUM BASES. 19 



Platinum 56,74 



Carbon 6,69 



Hvdrogen ; 1,81 



Nitrogen 15,89 



Sulphur 18,55 



99,68 



I have prepared the corapound by allowing carbonate of ammonia to act on a 

 solution of platinsulphocyanate of ammonia. The product is soon thrown down in the 

 form of small, brilliant yellow prisms. It contained 57,5! p. et. platinum. This cora- 

 pound is not identical with the sulphocyanate of platosammine, but isomeric. The so- 

 lution of the salt is easily decomposed by heating, when it deposits an amorphous, 

 yellowish precipitate. Muriatic acid dissolves by heating the compound to a yellow 

 solution, which soon deposits a yellowish-red precipitate. When dissolved in nitro- 

 muriatic acid it does not yield crystals of the chloride of platinammine, but orange- 

 coloured rhombical scales, and it seems that several other produets are also formed 

 by this reaction. I dåre not assume that the sulphocyanate belongs to the platose- 

 midiammine series. The sulphocyanate of platosemidiammine resembles closely the 

 compoimd, of which I am treating, but seems to give other produets by the action of 

 nitro-muriatic acid. 



I supposed that the compound might have the formula 



Pt(CyS), + 2(Pt{^ : ^) 



and to test that 1 dissolved in aleoholic sulphocyanate of ammonia the corresponding 

 double chloride in brownish scales, and obtained, by cooling, yellow stellated prisms. 

 The qvantity I prepared was too small for an analysis, for which reason I could only 

 treat it with nitro-muriatic acid. The produets of the reaction were bright four-sided 

 prisms with domatical ends. Those ciystals could not be identical with those, which 

 I obtained by dissolving in nitro-muriatic acid the sulphocyanate prepared directly by 

 ammonia and platin-sulphocyanate of ammonia. I cannot consequently explain the 

 cause of the isomerism of the compound with the sulphocyanate of platosammine. 



7. Sulphocyanate of platosammine and silver R(CyS) 6 2Ag 2 ", is precipitated in the 

 form of a dirty whitish yellow powder on adding nitrate of silver to a warm solution 

 of the sulphocyanate of platosammine. 



Analysis of material dried at 100°: 



0,5000 gr. gave 0,3iio gr. platinum and silver, containing 0,0990 gr. platinum. 



Found Theory 



Platinum 19,80 19,56 



Silver 42,40 42,69 



1 am not quite sure that the analysed product was not a mixture of Ag 2 2CyS 



and PtJ NH3(CyS HAa" 

 ana ^t )NHj(CyS) jAg. 2 . 



