416 



but appearing capable even of forming compounds in which the 



number of dichloride-of-platinum-molecuks diminishes whilst the 



amount of hydrochloric acid remains constant, such as 



B^ U H 5 N 3I 3HC1, 2PtCl 2 , 



R/H.N^SHCI, PtCl 2 . 



Fortunately most of the salts, and more especially the platinum- 

 compounds, crystallize with remarkable facility, so that the above fact 

 being once established, the circumstances were soon determined under 

 which the more important saline compounds could be with certainty 

 reproduced. The separation of the triamines w r as chiefly effected in 

 the form of chlorides, bromides, and iodides, or of platinum-salts 

 and gold-salts. 



Both diethylene-triamine and triethylene-triamine are powerfully 

 alkaline liquids, soluble in every proportion in water and alcohol, 

 almost insoluble in ether. They boil respectively at 208 and 216; 

 but owing to the comparatively small quantities with which I have 

 had to work, these determinations may require some slight corrections. 

 Both bases neutralize the acids completely, giving rise to the forma- 

 tion of well-defined, and in most cases beautifully crystallized salts, 

 which are generally very soluble in water, difficultly soluble in alcohol, 

 insoluble in ether. The aqueous solution of the salts is not precipi- 

 tated by the solutions of the alkalies, owing to the solubility of the 

 bases ; but solid hydrate of potassium separates them in the form of 

 nearly colourless oily liquids, which rapidly attract carbonic acid 

 from the atmosphere. 



The composition of diethylene-triamine was fixed by the analysis 

 of the free base itself, which was found to be anhydrous, 



CH N-^ 



^ rirN 



and of the triatomic chloride, bromide and iodide, which are all re- 

 markable for the facility and beauty with which they crystallize. 

 These salts contain respectively, 



Trichloride of C H N Cl f^ 2 ***)* 1 N l^Cl 



Diethylene-triammonium 4 ic 3 3 ~~ H 8 J 1 3 J 3 " 



Tribromide of c H N Br _ [~(C 2 IT 4 )/ 1 1 ^ ~] " Bj . 



Diethylene-triammonium 4 16 3 3 H 8 J i 3 I 3 ' 



Tri-iodide of r H N T - [~( C 2 n .)>" 1 N l w T 



Diethylene-triammonium Vy 4 11 i6^ 3 1 3 jj 



