H. L, Wheeler — Double Halides of Antimony, etc. 269 



Aet. XL. — On the Double Halides of Antimony with 

 Rubidium • by H. L. Wheeler 



The investigations of the double halides of antimony and 

 rubidium have hitherto been confined to the chlorides, and the 

 following salts have been described : 



1 : 1 Rubidium Antimony Chloride, RbCI . SbCl 3 

 5:3" « " 5RbCl . 3SbCl 3 



23:10 " " " 23RbCl. 10SbCl 8 



6 : 1 " " 6RbCl.SbCl, 



The first three of these compounds were described by Remsen 

 and Saunders.* These investigators, after a careful study of 

 the subject came to the conclusion that the salt 6RbCl . SbCl s 

 described by Gocleffroyf does not exist. 



It has been shown by the author of the present article that 

 the 8 : 2 type of double salts is probably the only one formed 

 by the combination of the arsenic halides with those of caesium 

 and rubidium. J Moreover, since this type was observed by 

 Schaeffer§ in the case of the double halides of antimony with 

 sodium, potassium, and ammonium, and, since Remsen and 

 Saunders obtained the salt 3CsCl . 2SbCl 3 it seemed probable 

 that this type of double halides would exist with rubidium 

 and antimony. A thorough re-examination of the chlorides 

 has therefore been undertaken and the investigation has been 

 extended to the bromides and iodides. As a result of this 

 investigation the following compounds have been obtained : 



RbC1.2SbCl 3 .H 2 

 RbCI. SbCl,. 

 3RbCl . 2SbCI 3 . 3RbBr. 2SbBr, 3RbI .2SbI 3 



23RbCl . 1 0SbCl 3 (?) 23RbBr . lO.SbBr, (?) 



The first chloride, RbCI. 2SbCI, . H a O, is a new type of 

 antimony rubidium halides, which Remsen and Saunders did 

 not obtain. The second, 1 : 1, confirms the results of these 

 investigators, while the series of 3 : 2 salts, which includes a 

 chloride, bromide, and iodide, corresponds to the type expected 

 from analogy. The difference between the percentage compo- 

 sition required for the 3 : 2 chloride and that required for the 

 5 : 3 formula of Remsen and Saunders is small, and it is to be 

 noticed that these authors do not consider their formula as 

 definitely established. They say, " The analytical results ob- 

 tained from different samples varied considerably and it does 



* Am. Chem. Jour., xiv. 155. f Berichte, viii, 9. 



% This Journal, HI, xlvi, 88. § Pogg. Ann., cix, 611. 



