696 
MR. P. GRIESS ON A NEW SERIES OP BODIES IN 
The formation of nitrate of diazobromobenzol may be represented by the following 
equations : — 
I. G 6 H 6 BrN, NH0 3 + HN0 2 = 0 6 H 3 BrN 2 , NHO s +2H 2 O. 
Y — V Y - “ J 
Nitrate of bromaniline. Nitrate of diazobromobenzol. 
II. G 12 H 9 Br 2 N 3 +HN0 2 +2NH0 3 =2(G 6 H 3 Br N 2 , NH0 3 )+2H 2 0. 
. v Y ' ^ 7~V ' 
Diazoanrdobromobenzol. Nitrate of diazobromobenzol. 
Sulphate of Diazobromobenzol, G 6 H 3 BrN 2 , -SH 2 0 4 . 
The preparation of this compound from nitrate of diazobromobenzol and sulphuric 
acid corresponds so closely with that of the non-substituted (abromous) sulphate, that 
it may suffice simply to refer to the description already given of the preparation of 
the latter, and I will therefore restrict myself to a few remarks on its properties. 
Sulphate of diazobromobenzol crystallizes in very fine colourless prisms, which are 
very soluble in water, very difficultly soluble in alcohol, and almost insoluble in ether. 
The new body is comparatively stable, and can be crystallized from water without 
suffering the least decomposition, by allowing its solution to evaporate over sulphuric 
acid. Boiling water decomposes the compound, and heat causes it to explode. Its 
formula has been* established by a determination of the sulphuric acid only. 
0377 grm. gave 0-315 grm. of sulphate of barium. 
Calculated. 
-A. 
Found. 
G 6 H 3 BrN 2 
183 
65-12 
— 
SH 2 0 4 
98 
34-88 
35-15 
281 
100-00 
Hydrobromate of Diazobromobenzol, G 6 H 3 Br N 2 , HBr. 
This compound is prepared either by decomposing an aqueous solution of the previous 
salt by means of a sufficient quantity of bromide of barium and spontaneous evaporation 
of the filtrate, or by the action of an ethereal solution of bromine upon an ethereal solu- 
tion of diazo-amidobromobenzol. If prepared by this latter method the new compound 
speedily separates in crystals, on account of its insolubility in ether, and is obtained pure 
by filtering off from the mother-liquor and washing the crystals with ether. Its forma- 
tion may be expressed by the following equation : — 
G 12 H 9 Br 2 N 3 +4Br=G 6 H 3 Br N 2 HBr+G 6 H 4 Br 3 N+HBr. 
Diazoamidobromo- Hydrobromate of diazo- Tribromaniline. 
benzol. bromobenzol. 
The hydrobromate of diazobromobenzol forms pearly white shining scales which 
dissolve very readily in water ; like the hydrobromate of diazobenzol, they are more 
difficulty soluble in alcohol and quite insoluble in ether. In the dry state it can be 
preserved a long time without undergoing decomposition. On heating, it explodes 
