312 



on cooling in small needle-shaped crystals. Its composition was 

 found to be — ■ 



Expt. Calculation. 



100-00 213-2 



This corresponds with the formula C^^H^ PtN + HCl, which is 

 that of a hydrochlorate of platosopyridine corresponding to the hy- 

 drochlorate of platosamine. By treatment with nitrate and sulphate 

 of silver the salts of these acids are produced. 



The picoline platinum salt decomposes very slowly, but after eight 

 or ten days' boiling a platinopicoline is produced. If a little pico- 

 line be added to the solution, the change is complete in a few hours. 

 The bihydrochlorate is insoluble in water, and the double compound 

 containing that substance in combination with the original salt, and 

 of which the formula is 



C,2 H- N H CI Pt Cl,-^C-2 H. Pt N 2H CI, 



crystallizes in grains, and is much less soluble than the correspond- 

 ing pyridine compound. The properties of these substances will be 

 afterwards fully described. 



The platinochloride of ethylopyridine is very slowly decomposed 

 by boiling, but eventually a substance is deposited which as yet has 

 given only discordant results. A small quantity of pyridine appears 

 to promote the decomposition, but the most remarkable effect is pro- 

 duced by the addition of ammonia. The solution in this case is 

 completely decolorized by a few minutes' boiling, and it then gives 

 a white precipitate on the addition of carbonate of ammonia. The 

 substance so obtained is very sparingly soluble in water, and almost 

 insoluble in alcohol. Analysis showed it to be Raewski's carbonate, 

 the sesquihydrochlorocarbonate of diplatinamine. The action of 

 ammonia is readily explained by the equation 



Cj, Hj, N H CI + Pt CI2 + 2HN2 = N2 H^ Pt HCl + C,, H^ N HCl. 



