on the Ammonia'Cohalt Bases. 105 



which would represent the base which we have described under 

 that name, in which methylamin rephaces ammonia. We have 

 not yet been able to investigate this point with anj degree of 

 thoroughness, and will here only mention, that an experiment 

 made bj adding a solution of piperidin to one of chlorid of co- 

 balt and allowing the solution to stand for soiue time in a half- 

 filled flask, with frequent agitation, led to no decisive result. 

 We selected piperidin for this experiment, because this alkaloid 

 is comparatively easy to prepare, and does not itself oxydize by 

 exposure to the air. 



In the next place, the results of our investigation may be gcn- 

 I eralized by replacing cobalt by other metals. This, as we have 



already remarKed, has been done bv Claus, who obtained am- 

 monia-rhodium and ammonia-iridium bases corresponding to 

 Roseocobaltj and like this, triacid bases. To judge, however, 

 from the imperfect notices of Claus' papers which have hitherto 

 reached us, his compounds are not isomorphous with those of 



Roseocobalt 



We have ourselves made many experiments in this direction, 

 though as yet without interesting results. Iron and manganese 

 promised to aftbrd similar classes of compounds, yet in their be- 

 havior toward ammonia and oxygen tlie proto-salts of these 

 ^ metals exhibit no analogv to those of cobalt. With chromium 



the case may be different, but we cannot as yet pronounce with 

 certainty on this point. Experiments with nickel failed entirely, 

 and yielded only ammonia-salts of the protoxyd. 



The behavior of ainmoniacal solutions of proto-salts of iron 

 and manganese toward the mixture of gases which we haye de- 

 noted by the formula NOx is worthy of notice. When tartaric 

 acid is added to a solution of proto-chlorid of iron or manga- 

 nese, and after the addition of a' large excess of ammonia, a 

 rapid current of ISTOx is passed through the solution, the liquid 

 soon becomes dark colored, and after a time the whole of the 

 Ci iron or manganese is precipitated as a dark brown or nearly 



black flocky substance. The filtrate is free from the metal em- 

 ployed. No ammonia-iron or ammonia-manganese base is, how- 

 ' ever, formed under these circumstances. 



In order to afford a general view of the results of our investi- 

 gation, we will here give a table of the formulae of the bodies 

 ^ which we have analyzed, or whose constitution has been inferred 



^ from analogy of crystalline form, 



' RoseocobalL 



i 



4 



t Chlorid, ... - 5NH3?Coa.C!34.2HO. 



Chlorplatlnale, - - 6NIl3?Co2.Cl3-|-,?PtCl2-|-8nO. (?) 



» 



Sulphate, - - - oNII* . C02 . O3, SSOa-^-SHO. 



I SECOND SERIES, VOL. XXIV, NO. 70. JULY, 1857 



>t 



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