On the Colouring Matters produced from Aniline, 551 



The salt retains a minute quantity of water at 100°, but becomes 

 anhydrous at 130°. At this temperature it contains 



C 20 H 19 N 3 , H CI. 



The salt, like most of the rosaniline-salts, is very hygroscopic, a 

 character which must not be lost sight of in the analysis of these 

 compounds. 



The monacid chloride dissolves more readily in moderately strong 

 hydrochloric acid than in water. If this solution, gently warmed, 

 be mixed with very concentrated hydrochloric acid, it solidifies, on 

 cooling, into a network of beautiful brown-red needles, which have 

 to be washed with concentrated hydrochloric acid and dried in vacuo 

 over sulphuric acid and lime, since water decomposes them with 

 reproduction of the monacid compound. The salt obtained by the 

 action of concentrated hydrochloric acid is the compound with three 

 equivalents of acid, 



C 20 H 19 N 3 , 3H CI. 



Exposed to 100° this salt gradually loses acid, the brown crystals 

 becoming indigo-blue ; and if the exposure be continued until the 

 weight becomes constant, the original green salt with one equivalent 

 of acid is reproduced, which was identified by analysis. 



The two chlorides combine with dichloride of platinum. The 

 compounds thus produced, being uncrystallizable, are not easily ob- 

 tained in a state of purity. From platinum-determinations, which 

 have given only approximative results, I infer that they contain 

 respectively, 



C 20 H 19 N 3 , HC1, PtCl 2 and 



C 20 H 19 N 3 ,3HCl,3PtCl 2 . 



The Hydrohromate of Rosaniline resembles in every respect the 

 hydrochlorate ; it is even more difficultly soluble than the latter ; 

 it contains 



C 20 H 19 N 3 ,HBr. 



Hydriodate of Rosaniline. — Green, very difficultly soluble needles 

 of the composition 



^20 H 10 N 3 , HI. 



Sulphate of Rosaniline is readily obtained by dissolving the free 

 base in boiling dilute sulphuric acid. On cooling, the salt is deposited 

 in green metal-lustrous crystals, which by one recrystallization be- 

 come perfectly pure. At 130°, at which temperature it loses a small 

 quantity of water, the formula of the salt is 



SO, 



C 20 H 19 N 3 ,in 



C 20 H 19 *S» H J 



1* 



The acid sulphate crystallizes with difficulty. I have not ana- 

 lysed it. 



Oxalate of Rosaniline, — The preparation and properties of this 

 salt are similar to those of the sulphate. The salt retains at 100° 

 one equivalent of water, and is at this temperature represented by 

 the formula 



C 20 H lfl N„H 



C 30 



H 19 N 3 , HI p, A I IT A 



H 19 N 8 , H J ^ U ± + W - U ' 



