58 P. T. CLEVE, 



|nh ~NH I 

 The formula Pt 2 < NH *~ NH *p0 2 requires: 



lo ' 1 



Theory Experiment 



1 2 



Platinum 70,75 69,95 70,77 



Sulphur 5,78 5,63 5,55 



Summary. From these facts we may conclude that by the action of the hydrate 

 of sodium upon the chloride of platosemidiammine anhydro-hydrate of a condensed 

 base of platinum the diplatosemidiammine is formed: 



/OH 



,|nh 3 -nh 2 



1 L -'|NH 3 -~~NH 2 +n 2^ 

 lOH. 



This hydrate gives the following salts, with acids: 



(Cl |ON0 2 i o v 



JNH 3 -NH 2- JnH 3 ~NH 2 JnH 3 ~NH 2 | 



rr '2|NH 3 ~NH 2 > rt '2|NH 3 ~i\H 2 > rt 2 |NH 3 ~NH 2 | ÖU *> 

 Ici 10N0 2 lo I 



whieh are all black insoluble powders. The chloride is slowly decomposed by hydro- 



chloric acid in two mol. chloride of platosemidiammine. 



By the action of nitromuriatic acid the l^drate yields the anhydro-chloride of 



diplatinsemidiammine 



,ci 2 

 nh-nh 2 



r c -''lNH,~NH, + n.U. 



»0] 2 



The amidogen is monovalent in all these compounds. 



G. COMPONDS OF PLATINSEMIDIAMMINE. 



(Platinaoxid-ammoniak Cleve.) 



R=P t p~ NH 3 

 rci 2 

 1. Chloride, Pt<NH 3 ~NH 3 ci. The chloride is easily obtained by treating the chlo- 

 ride of platosemidiammine with chlorine, or by boiling it with nitro-muriatic acid. The 

 chloride is a heavy lemon-coloured powder. Examined with the microscope it seems 

 to consist of small rhombic or hexagonal tablets, and sometimes it forms flat needles 

 or twin-crystals. It is with difficulty soluble in water. I have found one part of the 

 chloride to require 65 parts boiling water and 300 parts water of 0° for solution. The 

 chloride does not contain water. When heated to 160° it assumes an olive-green co- 

 lour, but its weight does not change at this temperature, at 210° it becomes dark- 

 green,'*. and slowly decomposes at 240°. 



