DE. A. W. HOEMANN ON THE PHOSPHOEHS-BA8ES. 
525 
Cj4 H34 Asg Big — . 
(C 2 H 4 )" 
(C2H,)3As-^" 
B12 
yielded, when debrominated, the powerful alkali 
^14 ®36 -^^2 ^2 “ 
H. 
O 
2* 
Treated with acids, this alkali produces a series of fine salts, amongst which the 
di-iodide deserves to be mentioned ; it equals in beauty the corresponding diphospho- 
nium-compound. I have fixed the composition of the series by the analysis of the 
platinum-salt and gold-salt. 
Platinum-salt . — Pale yellow crystalline precipitate, similar to the diphosphoniuni- 
compound, difiicultly soluble in water, soluble in boiling concentrated hydrochloric acid, 
from which it crystallizes on cooling. 
I. 0’8610grm. of platinum-salt (not recrystallized), treated with sulphuretted hydro- 
gen, &c., gave 0‘2220 grm. of platinum. 
II. 0 '4885 grm. of platinum-salt (crystallized from hydrochloric acid), analysed in 
the same manner, gave 0T265 grm. of platinum. 
The formula 
^14 ^34 -^®2 ^^2 ^^6 — 
/p TT y^(^2 ^ 5)3 
^ ^^CgHg)3AsJ 
Cl.g,2PtCl2 
requires the following values : — 
Theory. 
A 
Experiment. 
A 
( 
I 
I 1 
I. II. 
I equiv. of Diarsonium . . 
. 352-0 
46-17 

2 equivs. of Platinum . 
. 197-4 
25-89 
25-78 25-89 
6 equivs. of Chlorine . 
. 213-0 
27-94 
I equiv. of Platinum-salt 
. 762-4 
100-00 
Gold-salt . — The dichloride obtained after separating the platinum in the two preceding 
analyses by means of sulphuretted hydrogen, was precipitated by trichloride of gold. 
Yellow slightly crystalline precipitate, soluble in hydrochloric acid, from which it 
separates in golden-coloured plates. 
0-5859 grm. of the salt, treated with sulphuretted hydrogen, &c., gave 0-2220 grm. of 
gold. 
The formula 
requires 
^14 ^34 ■'^^2 -^^2 — 
(C 2 H 4 )" 
{C,IL,},A,1 
(Cg Hg )3 As_ 
Clg, 2 Au CI 3 
Theory. 
1 equiv. of Diarsonium . 
. 352 
34-18 
2 equivs. of Gold . . 
, . 394 
38-25 
8 equivs. of Chlorine . . 
. 284 
27-57 
1 equiv. of Gold-salt . . 
. 1030 
100-00 
Experiment. 
37-89 
