420 



VI. " Notes of Researches on the Poly-Ammonias." No. XVII. 

 Mixed Triammonias containing Monatomic and Diatomic 

 Radicals. By A. W. HOFMANN, LL.D., F.R.S. Received 

 July 29, 1861. 



Diethylene-triamine and triethylene-triamine, a short history of 

 which I laid before the Royal Society some weeks ago, are the first 

 terms of a group of a series of triatomic nitrogen-bases, whose con- 

 struction and composition may be varied almost ad infmitum. 

 Similar compounds, there can be no doubt, will be produced by all 

 the homologues of ethylene. With the exception of a few experi- 

 ments on the action of ammonia on dibromide of methylene, I have 

 not hitherto entered upon this part of the inquiry. Not less numerous 

 is the series of triatomic bases derived from the ethylene-triamines by 

 the further substitution of either monatomic or diatomic radicals for 

 the remaining hydrogen-equivalents. I have satisfied myself that 

 the ethylenated triammonias are powerfully acted upon by the iodides 

 of methyl and ethyl, and likewise by dibromide of ethylene. I have 

 not examined in detail the substances produced in these reactions, 

 but I have had occasion to glance at the ethylated derivatives of the 

 ethylene-triamines when studying the diatomic bases generated by 

 the action of dibromide of ethylene upon the ethylafced monamines. 



In a former note I have pointed out that the action of dibromide 

 of ethylene on ethylamine gives rise to the formation of 



Ethylene-diethyldiamine (C 2 H 5 ) 2 



H a 

 and 



Diethylene-diethyldiamine /Q^^ } N a . 



These two compounds constitute the chief part of that portion of 

 the volatile bases derived from ethylamine which, after several recti- 

 fications, passes over below 200. The bases boiling above 200 are 

 a mixture which, dissolved in hydrochloric acid, yields with dichlo- 

 ride of platinum a splendidly crystallized platinum-salt. By nume- 

 rous crystallizations this salt may be separated into one which is 

 difficultly soluble in water, and another which is far more soluble. 



