484 
DE. A. W, HOFMAJs^” ON THE PHOSPHOEUS-BASES. 
I. 0-2660 grm. of mercury-salt gave 0-2390 grm. of the diphosphonium-platinum-salt 
and 0-1255 grm. of sulphide of mercury. 
II. 0-5650 grm. of mercury-salt gave 0-2670 grm. of sulphide of mercury and 0-5515 
gi-m. of chloride of silver. 
These analyses lead to the formula 
Ci4H34P2Hg3Cl, = r(C2HJ 
„(C2H3)3P- 
(C2H3)3P. 
CI3, 3 Hg Cl, 
as seen from the following comparison : — 
Theory. 
Experiment. 
/V 
1 equiv. of Diphosphonium . 264-0 
3 equivs. of Mercury . . . 300-0 
5 equivs. of Chlorine . . . 177-5 
1 equiv. of Mercury-salt . . 741-5 
I. 
II. 
35-60 
35-18 
40-46 
40-64 
40-73 
23-94 
24-14 
100-00 
Tin-salt . — This salt, which is prepared like the mercury-compound, crystallizes from 
water in large well-formed prismatic crystals. According to some determinations, which, 
however, gave only approximate results, the tin-salt appears to have the composition 
(C2H3)3P- 
CI2, 4 Sn Cl. 
(C2H3)3PJ 
Di-iodide and Iodide of Zinc . — On mixing the two solutions, a ci-j'stalline precipitate is 
obtained, which separates in long needles when recrystallized from boiling water. The 
salt, which is apt to assume a yellowish coloration, contains 
V,(C2H5)3P' 
^14 H34 P2 Zn2 14 — 
(C2HJ' 
I2, 2ZnI. 
(C2H3)3PJ 
0-5735 grm. of zinc-salt gave 0-6401 grm. of iodide of silver. 
The above formula requires the following values : — 
Theory. Experiment. 
1 equiv. of Diphosphonium 
. '264 
31-54 
— 
2 equivs. of Zinc 
. 65 
7-77 
— 
4 equivs. of Iodine .... 
. 508 
60-69 
60-31 
1 equiv. of Zinc-salt .... 
. 837 
100-00 
Dihromide and Bromide of Silver . — I have mentioned this salt aheady when describing 
the preparation of the hydrate from the dibromide. When oxide of silver, u hich should 
not be mixed with too much water, is added in small portions to a boiling concentrated 
solution of the dibromide in alcohol as long as it dissolves, the filtered solution deposits 
on cooling white crystals, which contain 
^14 H34 P2 Ag Br3 — 
(C2H4) 
„(C2H5)3P' 
(C2H5)3P. 
61-2, Ag Br. 
