()X AMMONIACAL PLATINUM BASES. 15 



| Br 

 2 N H 3 . O . N 2 

 o p t ) NH,~NH, 



ö ' ri2 \ XH,"NH 2 )• 

 I 2NH 3 .O.N0 2 

 l Br 



D. COMPOUNDS OF PATOSAMMINE. 



The second basis of Reiset. 



Ti"— Pt" i ^"3 



K rt INH3 



1. Chloride R CL was prepared by Reiset 2 ) by heating the dry chloride of pla- 

 todiammine and by precipitating the sulphate of the basis with mnriatic acid. The 

 compound may easily be prepared by heating the dry and finely pulverised chloride of 

 platodiaramine at a teinperature, at which vapours of sal ammoniac commence to be 

 visible. Large quantities of ammonia are given np and the white colour of the chlo- 

 ride of platodiammine is changed into yellow. After cooling the powder is washed 

 with water, which dissolves undecomposed chloride of platodiammine and leaves the 

 chloride of platosammine, which is almost insoluble in cold water, as a 3^ellow powder. 

 The chloride may be obtained in a perfectly pure state by dissolving it in boiling 

 water and cooling off the solution, or more easily by transforming the rough chloride 

 into nitrate with the aid of nitrate of silver and precipitating the solntion with hydro- 

 chloric acid. 



The chloride has a sulphur-yellow colour, and seems, when examined in the mi- 

 croscope to crystallise in very small rhombohedrons. According to my determination 

 1 part of the chloride can be dissolved in 130 parts boiling water and in 4472 parts 

 water of <)° 3 ) 



Analysis : 

 0,39i5 gr. gave 0,2575 gr. metallic platinum and 0,3660 gr. chloride of silver = 0,0905 

 gr. chlorine. 



Found 

 Cleve Reiset Theory 



Platinum 65,27 65, ni 64,84 197,88 — 65,35 



Chlorine 22,94 — — 70,92 — 23,42 



Hydrogen — — — 6,oo 



Nitrogen — — — 28, oo 



202,8.» 



') Cleve K. Yet.-Ak. Handl. Bd 7 N:o 7 p. 19. 



2 ) Reiset Ann. de Chim. et de Phys (3) 11. 1844 p. 427—28—31. 



3 ) I have found in the solution a verv small qvantity of the chloride of platomonodiammine. 



4 ) Peyrone Ann Ch. u. Pharm. 61, 1847 p. 180 states that the chloride is soluble in 140 parts boiling wa- 

 ter, which may be regarded as closely agreeing with my observation, as the chloride is precipitaded at the 

 slisjhtest eoolim? of the solution. 



