Art. 10. — Iv. Matsuuo 



If the two chlorine atoms of this compouiul are rephieed hy 

 water, we are able to produce the triaquotriammine cobaUic salt 

 (I). Tlius, wlien the dichro-salt is dissolved in a consideralile 

 quantity of water, acidified witli hydrocldoric acid, and evaporated 

 in vacuo, (hu'k violet crystals separate, analysis of which satisfies 

 the formula [Co (NH,)/(H,0)h] CI, not [Co (NH,)3 (H^O), CI] CI, HA 

 Thus, 0.2032 gr. of the substance gives 0.1138 gr. C0SO4; 

 0.1353 gr. of the salt gives 0.2150 gr. AgCl. 



Calculated Obtaineil 



Co 21,3 % 21,8 % ■ ^ 



CI 39,31% 39,32% 



When the salt is heated at a temperature of 100-1 lO^'C for 

 one liour it does not change in weight, vvliich suggests that there 

 is no water of crystallization. The absorption spectra of this salt 

 were compared with those of the other isomer; the great diver- 

 gence between them indicates the différent configurations. 



Thus I was able to obtain one of the isomers of triaquotriam- 

 mine cobaltic salts, verifying also both of their configurations. 

 As the eis and consecutive triaquotriammine col>altic salt was. 

 prepared by the action of water U})on [Co (NOjjg (NHj^]^ tlie 

 constitution of the latter must be as follows : '' 



NE, 



NO, 



TJie trans-tiiaquotriammine cobaltic salt is not stabli« in 

 water; at first the solution is bhiish violet in colour, l)ut afterwards 

 it shows exactly the same colour as the solution of the eis and 

 consecutive, i.e. reddish violet. The same reaction takes place in 

 the case of the diaquodiethylenediamine cobaltic salts. Wlien the 

 trans-salt stands for a long time in water or when it is warmed for 



