on the Ammonia'Cohalt Bases. 99 



By adopting G erbardt^s view of the constitution of tlic sesqiii- 



oxyds, Eogojski reduces the formula of chlorid of Luteocobalt, 



6NII3 .C02CI3, for the form 2NII3.C0CI in which co represents 



, cobalt with f of its usually received equivalent. To this body 



he gives the name Dicobaltinaniinj and considers it analogous to 

 to the chlofids of Diplatosamin and Palladiamin 2NH3.PtCl 

 and 2XII3 .PdCl. This view applies very well to several other 

 salts of Luteocobaltj as for example, the broraid, iodid, nitrate, 

 and chlorplatinate, the formulae of which become 



2Nn3 . coBr or X:2n6co, HBr 



f 2NH3.C0I or N2II5CO, HI 



^ 2NII3 . coO, XO5 or N2H5C0, no, XOa 



rH3,coCl+PtC]5-f2HO or NaHoco, HCl-i-PtCb+2H0, 



"We have remarlced already that the compound 6NH3 .C02CI3 





L 

 ft 



} 



:S 



I 



+6NH 



es the formula 



€14-2NH3,coO, SO3, or NaHsco, HCI-I-SO4H3 



has no real existence, but is merely a mixture of the chlorid and 

 sulphate which are Lsomoriihous salts, Rogojsld's parallel be- 

 tween this and the sulphate of Gros's base, which according to 

 Gerhardt's view has the formula 



NsHipta, 2lIC14-X2U4pt2, SO4H2 



is consequently illusory. 



On the other hand, moreover, it must be remembered that 

 Uogoj ski's view applies only to the compounds of Luteocobalt, 

 and fails entirely to reduce the formulae of tlie other cobalt bases 

 to more simple expressions, since it requires us, in these cases, 

 to admit fractions of equivalents. Thus the formula of the 

 chlorid of Purpureocobalt becomes on this view 



f 



must 



3X|H5coCl-l-2PtCl9. 



Even in the case of those compounds of Luteocobalt which 

 contain water, Rogojski's view ceases to give simple expressions, 

 since in the majority of these the number of equivalents of 

 water is not divisible by three. The difficulty becomes still 

 greater in the case of the compounds of Xanthocobalt We 

 have, therefore, no hesitation in rejecting Rogojski's theory as 

 too limited in its application. 



We consider the ammonia-cobalt bases as conjugate com- 

 pounds of sesquioxyd, sesquichlorid, &c., of cobalt, the five or 

 six equivalents of ammonia, or of ammonia and deutoxyd of 

 nitrogen, forming the conjunct, and serving to give to the sesqai- 

 compound of cobalt the degree of stability which it possesses in 



& 



