ORGANIC BODIES CONTAINING METALS. 
419 
Examination of Solid Products. 
The capillary extremities of the tubes in which the iodide of ethyl had been exposed 
to the action of tin. were broken off under sulphuretted water and beneath a jar filled 
with the same liquid*; the gases evolved were preserved for eudiometrical investiga- 
tion. The crystalline product of the reaction was then withdrawn from the tubes, 
and after being exposed to a gentle heat for a few minutes to expel the iodide of 
ethyl that had escaped combination, was treated with alcohol, in which the crystals 
readily dissolved, leaving only a small residue of a bright red colour, which proved 
to be protoiodide of tin. The filtered alcoholic solution was then placed over sulphuric 
acid in vacuo, where it soon deposited a large crop of long needle-like crystals, which, 
when freed from the mother-liquor, washed with a small quantity of dilute alcohol, 
dried between folds of bibulous paper, and finally over sulphuric acid in vacuo, yielded 
the following analytical results : — 
I. r6806grm., treated with aqueous solution of ammonia, was immediately de- 
composed, iodide of ammonium being formed, whilst the iodine in the original com- 
pound became, as I shall show below, replaced by oxygen ; this oxide, which is 
almost absolutely insoluble in ammonia, collected on a filter and dried at 100 ° C., 
weighed •7*263 grm. ; decomposed by boiling nitric acid it gave '581 1 grm. peroxide of 
tin. The ammoniacal solution, acidulated with nitric acid and precipitated by nitrate 
of silver, yielded l’8418grm. iodide of silver. After precipitation of the excess of 
nitrate of silver by hydrochloric acid, sulphuretted hydrogen was passed through the 
solution, and the slight precipitate formed was washed, dried, ignited and added to 
the above peroxide of tin, in the weight of which it is included. 
II. T4254grm., burnt with oxide of copper, 2 inches of metallic copper being 
placed in front of the combustion-tube, gave -5858 grm. carbonic acid and *2975 grm. 
water. 
III. T2209grm. gave 0'5008grm, carbonic acid and ’2580 grm. water. 
IV. 2‘0980grms., treated as described in No. I., yielded *9218 grm. of the body 
produced by the action of solution of ammonia, which yielded '7239 grm. peroxide of 
tin. The ammoniacal solution, precipitated by nitrate of silver as in No. I., produced 
2’2883 grins, iodide of silver. 
V. -91 13 grm. gave *3735 grm. carbonic acid and •1908 grm. water-f. 
These numbers show that the crystalline body is a compound of one atom of ethyl, 
one atom of tin, and one atom of iodine. The formula — 
C 4 H 5 Sn I 
* Journal of Chemical Society, vol. ii. p. 267. 
t The substance used in Nos. IV. and V. was produced by the action of light, that used in the other analyses 
by the agency of heat. 
