726 
ME. P. GrEIESS ON A NEW SEEIES OE BODIES IN 
barium-salt of a new acid which I will call tetrasulphodiphenylenic acid; the soluble 
portion contains another new acid, for which the name trisulphodiphenylenic acid may 
be adopted. 
I will first endeavour to give a brief description of the former. The barium-salt of 
this acid, obtained as before mentioned, being only very slightly soluble in water, could 
not well be purified by recrystallization ; I preferred therefore to convert it into the 
ammonium-salt, which served me as a starting-point for the preparation of all the saline 
compounds presently to be described. The ammonium-salt is readily obtained by 
decomposing the barium-salt with a solution of carbonate of ammonium. The mixture 
is heated for a short time, the insoluble carbonate of barium filtered off, and the filtrate 
concentrated on a water-bath till the ammonium-salt crystallizes out on cooling. One 
recrystallization from alcohol renders it in the form of perfectly pure white prisms. 
Barium-salt of Tetrasulphodiphenylenic Acid , € 12 H 6 , -S 4 H 2 Ba 4 0 15 . 
To a rather concentrated boiling solution of the ammonium-salt chloride of barium is 
added, when this salt is precipitated as white needles or prisms ; the crystals are allowed 
to subside, and, after the mother-liquor has been separated by filtration, repeatedly 
washed with cold water ; in this manner they are obtained quite pure. The substance 
employed for the following analyses was dried between 150° and 160°. 
I. 0*612 grm. gave 0*4055 grm. of carbonic acid and 0*070 grm. of water. 
II. 0*365 grm., decomposed by nitric acid, gave 0*4327 grm. of sulphate of barium, 
corresponding to 16*28 per cent, of sulphur. 
III. 0*2845 grm., treated with sulphuric acid, gave 0*177 grm. of sulphate of barium 
= 34*14 per cent, of barium. 
IV. 0*6185 grm., treated as before, gave 0*4327 grm. of sulphate of barium= 34*77 
per cent, of barium. 
These numbers lead to the formula 
Calculated. 
144 18*14 
8 1*00 
128 16*21 
274 34*51 
240 31*35 
794 100*00 
Dried over sulphuric acid, the salt retains four molecules of water of crystallization. 
0*452 grm., dried as above, lost between 150° and 160° 0*037 grm. of water. 
€ 12 H 8 Ba 4 S 4 O 15 +4H 2 0. 
€ 12 
h 8 
$4 
Ba 4 
Ci 2 H 8 S 4 Ba 4 0 15 . 
Pound. 
r \ 
I. II. III. IY. 
18-07 
16-28 
34*14 34*77 
