194 PROFESSOR LETTS AND N. COLLIE ON THE 
Crystallised Salt. 
(1) 26-055 grms. lost at 110° 2:03 grms. water = ‘7°7 per cent. 
 :2)*,  B'2892 6 5 35 258 Toul] ig 
obra Calculated for 
I, IL. (C,H,),PC1,2H,0. 
Water, rer 8:0 oe 
Crystallised from Chloroform. 
42015 grms. lost at 110° ‘8938 erm. chloroform = 21:2 per cent. 
Calculated for 
Obtained. (C,H,),PC1,CHCI, . 
Chloroform, PALEY AT 
Chloroplatinate of Tetrabenzyl-Phosphonium—tThis compound is easily 
formed on mixing aqueous or alcoholic solutions of chloride of platinum and 
chloride of tetrabenzyl-phosphonium. In the former case a light orange 
precipitate is produced, which appears to be amorphous to the naked eye. In 
the latter, if the two solutions are boiling and dilute, a distinctly crystalline 
precipitate is produced of a darker colour. 
The chloroplatinate is very insoluble, almost absolutely so in water, and 
is only very slightly soluble in alcohol. 
The composition of the salt was determined by a combustion with chromate 
of lead and oxide of copper—as in all chloroplatinates of phosphines and 
phosphoniums the determination of chlorine and platinum is very tedious and 
uncertain. 
If attempts are made to determine platinum by the weight of the residue 
left on ignition, the results are often as much as 2 per cent. too high, owing to 
the formation of phosphide of platinum. Precipitation by sulphuretted hydrogen 
we have found to be always incomplete with chloroplatinates of benzyl- 
phosphines 
Hormann’s methodt gave us results which were too low. We could, in fact, 
discover no process for estimating the platinum in this salt, or the chlorine, 
and were in consequence obliged to fix its composition by an organic analysis. 
The results of this are as follows :— 
‘348 grm. gave “711 of carbonic anhydride = 55:7 per cent. carbon. 
348 =, ~,, ‘1508 of water =  4°8 per cent. hydrogen. 
Obtained. Calculated for {(C,H,),PCl},PtCl, . 
Carbon : : : 55°7 : . 560 
Hydrogen . 7 : 48 F : 5 dee 47 
* Tn this experiment the salt was heated for a whole day, and probably some of it volatilised. 
+ Trans. Roy. Soc. Lond., vol. exlvii. p. 575. 
