450 



Prof. A. Wurtz. 



[Mar. 30, 



This chloroplatinate forms magnificent orange-red crystals of 

 cliDorhombic aspect. It is quite soluble in hot water, and the con- 

 centrated boiling solution, when it cools, becomes cloudy, by depositing 

 oily drops which finally transform themselves into crystals. Decom- 

 posed in aqueous solutions by sulphuretted hydrogen, it furnishes a 

 chloride whose solution is colourless, and does not crystallise after 

 being evaporated during several days in the vacuum. Decomposed 

 by oxide of silver and water it furnishes a caustic soluble base, which 

 attracts the carbonic acid of the air. 



These reactions permit no doubt as the character of the new base, 

 which is a sort of aldehydine neurine. 



Action of the Ethylene Ghlorhydrin upon ot-Collidine. 



In order to obtain the a-collidine quaternary base corresponding to 

 neurine the method just indicated was employed. The reaction is, 

 however, more rapid than in the previous case; and after heating 

 for a few hours the oily layer disappears, excepting a few black drops 

 which still float on the liquid. The liquid on being extracted with 

 ether, evaporated in the vacuum, and finally treated by platinum 

 chloride, furnishes a crystalline orange-yellow precipitate less soluble 

 in water, and much less stable than the preceding one. The analyses 

 of this salt, dried over sulphuric acid, gave the following results ; — 



Experiment. 



, ■ » v Theory. 



i. n. 



Carbon 31-23 3223 



Hydrogen 4*16 .... 4'32 



Platinum 26*32 2616 .... 26*48 



The solution of this salt in hot water becomes of a deeper brown-red 

 colour the more concentrated it becomes. On boiling it decomposes. 

 Its solution in a large quantity of hot water, on cooling deposits 

 orange-red crystals tinged with brown. These crystals give the 

 following numbers when analysed : — 



Experiment. 



f * , Theory. 



I. II. III. 



Orange crystals from 

 the mother-liquor. 



Carbon 30*39 31-56 .... 32'23 



Hydrogen 4*09 4'18 .... 431 



Platinum 27*48 .... 27*02 .... 26*33 .... 26-48 



These crystals do not possess exactly the composition of the 

 chloroplatinate, (C 10 H 16 !N"OCl) 3 PtCl 4 , which must therefore be altered 

 by the actio?i of boiling water. In fact, the solution became deeply 



