1887.] 



On Antimony Pentachloride. 



385 



chloric acid collected was 4' 7 grams, while 8*5 grams should have 

 been found had the reaction taken place according to the equation — 



(COOH) 2 + SbCl 5 = SbCl 3 + C0 2 + CO + 2H01. 



This reaction was, however, impossible, owing to the small quantity 

 of carbon dioxide given off. The quantity of hydrochloric acid found 

 indicated that two molecules of antimony pentachloride had reacted 

 with one of oxalic acid. The tabular crystals from the chloroform 

 solution melted at from 148 "5° to 149°, decomposing at a somewhat 

 higher temperature. The values found by analysis corresponded to 

 the formula Sb 2 Cl 8 C 2 4 . 



1. 0*4860 gram substance gave 0'2637 Sb 2 S 3 . 



2. 0-2647 „ „ 0-1421 Sb 2 S 3 . 



3. 0-1444 „ „ 0-2670 AgCl. 



4. 0-2261 „ „ 0-4174 AgCl. 

 5.0-8117 „ „ 0-1960 C 2 4 Ca + H 2 0. 

 ^.0-2522 „ „ 0-0589 C 2 4 Ca + H 2 0. 



7. 0-2956 „ „ 0-0415 C0 2 and 0-0160 H. 2 1 Combustion with 



8. 0-8777 ,, „ 0-1162 C0 2 and 0-0162 H 2 J lead chromate. 



Calculated Found. 



lur ( ^ 



Sb 2 Cl 8 C 2 4 . 1. 2. 3. 4. 5. 6. 7. 8. 



Sb . . 39-61 38-93 38-52 — — 



01... 46-10 — — 45-74 45-64 — — — — 



O . . . 3-89 — — — — — — 3-83 3-61 



C 2 4 14-28 _____ 14-47 14-07 — — 



H... 0-0 — — — — — — 0-59 0-20 



The compound, Sb 2 Cl 8 C 2 4 , is formed according to the equation — 

 (COOH) 2 + 2SbCl 5 = C 2 4 Sb 2 Cl 8 + 2HC1. 



Proceeding exactly as described above, but taking one molecule of 

 oxalic acid to two of antimony pentachloride, i.e., twice the quantity, 

 almost the entire product is soluble in chloroform. 



37'2 grams SbCl 5 dissolved in 55 grams CHC1 3 and 

 5 - 5 grams (COOH) 2 gave 



4*3 grams of HC1, the calculated quantity being 

 4' 8 grams. 



It is necessary to have a good return-flow condenser in order to 

 avoid a considerable quantity of chloroform distilling into the 

 weighed water, used for collecting the hydrochloric acid. On mixing 

 Sb 2 Cl 8 C 2 4 with warm water, it is decomposed, setting oxalic acid 

 free. This may be easily determined after removing the antimony 

 from the acid solution. The following constitutional formula seems 



2 f 2 



