Contributions to the history of the phosphorus-bases / by Augustus William Hofmann.
- August Wilhelm von Hofmann
- Date:
- 1861
Licence: Public Domain Mark
Credit: Contributions to the history of the phosphorus-bases / by Augustus William Hofmann. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![product of the reaction was treated with water, which extracted a soluble bromide from the ethylene-compound unacted upon. On evaporation, a beautiful bromide wras left, which, being copiously soluble in boiling, and sparingly soluble in cold alcohol, could be readily recrystallized from absolute and even from common alcohol. In water this substance is excessively soluble; it is therefore scarcely crystallizable from an aqueous solution. Analysis, as might have been expected, proved this salt to be the analogue of the bromethylated triethylphosphonium-salt. It contains C8 H19 As Br2 = [(C2 H4 Br) (C2 H5), As] Br. The bromide of bromethyl-triethylarsonium, the composition of which is sufficiently established by the analysis of the corresponding platinum-salt (see below), can be obtained in beautiful crystals. Their form—the rhombic dodecahedron—is identical with that of the corresponding bromethyl-triethylphosphonium-compound, wdiich the crystals resemble also in their general habitus. I quote the following from Sella’s examination:— “ System monometric. Forms observed:— 11 0 (Fig. 79). Angles. Calculated. Obser i'ed. 11 0, T1 0 o / = 90 0 O 90 / 8 110, 101 = GO 0 60 0 110, Oil II 05 O o 60 8 No influence on polarized light.” Fig. 79. Platinum-salt.—The solution of the previous salt, converted by treatment with chlo- ride of silver into the corresponding chloride, yields with dicliloride of platinum splendid needles of a double salt, difficultly soluble in cold and even in boiling water. I. 09695 grm. of salt, treated with sulphuretted hydrogen, &c., gave 02040 grm. of platinum. II. 1*2175 grm. of salt of a new preparation, analysed in the same manner, gave 0-2545 grm. of platinum. III. 1-2815 grm. of salt of the last preparation gave 0-2715 grm. of platinum. The formula C8II19 Br As Pt Cl.j = [(C2 H4 Br) (C, 115)3 As] Cl, Pt Cl2 requires the following values:—](https://iiif.wellcomecollection.org/image/b21309024_0120.jp2/full/800%2C/0/default.jpg)
