506 
DE. A. W. HOPMAXN OX THE PHOSPHOErS-BASES. 
According to Weiss : — 
a:b^:c=l: 0-5445 : 1-1255 ; aoc = 142° 11'. 
Forms observed: — 
CO a: oob : c; a: b : co c; — a: cob : c. 
According to Levy; — 
MM = 83° 13'; MP = 121°38'; 5 : A = 1 : 0-9884. 
Forms observed : — 
P, M, a’. 
Combinations observed : — 
0 01, 110 (Fig. 65). 
Fig. 65. 
The face 101 has not been directly observed, but was found to be a cleavage. There 
is also another cleavage 0 0 1, as distinct and easily obtained as 1 0 1.” 
The dibromide of hexmethylated ethylene-diphosphonium, treated with oxide of silver, 
yields the corresponding hydrate. 
^8 ^24 ^2 ^2 — 
[(C,HJ"(CH3)6PJ 
O 
25 
which forms with acids a series of salts resembling the corresponding ethyl-compounds. 
Of these I have briefly examined the di-iodide and the platinum-salt. 
Bi-iodide — ^The base neutralized with hydriodic acid furnishes a salt crystallized in 
difficultly soluble needles, surpassing in beauty the corresponding body in the ethyl- 
series. 
0-3515 grm. of salt gave 0-3775 grm. of iodide of silver, leading to the formula 
^8 ^22 ^2 ^2 — 
(C2 HJ" 
(CH3)3P7' 
(CH3)3PJ 
I 25 
which requires 
1 equiv. of Diphosphonium 
2 equivs. of Iodine . . . 
1 equiv. of Di-iodide 
Theory. 
( " ^ 
180 41-43 
254 58-57 
IS 100-00 
Experiment. 
57-92 
Platinmmrsalt . — This is an apparently amorphous precipitate, which is nearly insoluble 
in water, dissolves with extreme slowness in boiling hydi-ochloric acid, and separates 
therefrom on cooling in golden-yellow laminae, very much like those of the platinum- 
salt of the hybrid ethylene-trimethyl-triethyl-diphosphonium. It consists of 
^8 ^22 P2 P ^2 ^^6 
(C. 3 H,) 
„(CH3)3P-^" 
CL,,2Pt Cl,. 
(CH3)3PJ 
I. 0-4940 grm. of platinum-salt gave, when precipitated by sulphuretted hydrogen, 
&c., 0-1650 grm. of platinum. 
II. 0-5730 grm. of platinum-salt gave 0-1900 grm. of platinum. 
