516 
DE. A. W. HOFMAIslS’ OX THE PHOSPHOEUS-BASES. 
These numbers correspond to the formula 
Ci2H3oPNPt,Cle = 
a„ 2PtCL 
Theory. 
I ^ 
1 equiv. of Phosph ammonium 
219-0 
34-79 
2 equivs. of Platinum . . 
197-4 
31-37 
6 equivs. of Chlorine . . . 
213-0 
33-84 
1 equiv. of Platinum-salt . . 
629-4 
100 00 
Experiment. 
A 
II. 
31-77 31-68 
Action of TeIMETHYLAMINE on the BeOMIDE of BEOMETIIYL-TEIETHYLPHOSPHONIUir. 
Ethylene-teimethyl-teiethylphosphammonium-compounds. 
As to the preparation and properties, I may refer to the preceding paragraphs. It is 
only necessary to quote the analysis of the platinum-salt, which crystallizes in beautiful 
needles. 
I. 0-4768 grm. of platinum-salt gave 0-3715 grm. of carbonic acid and 0-1907 grm. 
of water. 
II. 0-7485 grm. of platinum-salt, when fused with carbonate of sodium. See., gave 
0-2415 grm. of platinum and 1-0580 grm. of chloride of silver. 
The formula 
requires 
C,iH,3PNPt,Cl6 
(C2H3)3PT' 
(CH3)3NJ 
C\,, 2PtCl2 
Theory. Experiment. 
( 
( — 
I. 
^ 
II. 
Cji 
132 
21-45 
21-29 
H28 
28 
4-55 
4-45 
P 
31 
5-04 
N 
14 
2-27 
ptj 
197-4 
32-08 
32-26 
Cle 
213 
34-61 
34-96 
615-4 
100-00 
The examination of this compound has induced me to perform an experiment which 
may here be briefly mentioned. The action of trimethylamine on dibromide of ethylene 
gives rise to the formation of a beautifully crystallized salt, the bromide of bromethyl- 
trimethylammonium, of which I have already given a fugitit e sketch in the ‘ Pro- 
ceedings of the Eoyal Society ’ *. I was curious to ascertain whether the dibromide, 
generated by the union of trimethylamine with the bromide of hvom.et\\j\-triethyl-])]ws- 
phonium, could likewise be formed by submitting the bromide of broniethyl-f/-/iEcf//y/- 
* Proceedings of the Eoyal Society, vol. ix. p. 293. 
