4 P. T. CLEVE, 



composed of the double chloride of protochloride of platinum with the chloride of Gros 

 (Am. Plåt. för. p. 46). In 1868 I published in the Transactions of the Roy:l Acad. of Sciences 

 of Stockholm 1 ) two memoirs, containing new contributions to the history of the amrao- 

 nia-platinura-componnds. In the first of those papers I described the products, which 

 arise by the action of salts of silver on the broraosulphate of the basis of Gros 



f Br 



Pt l 4nh 3 .so 4 . I fonnd that one equ. sulphate of silver gives with the bromosulphate 



\ Br 



[Br 



the compound Pt 4nh 3 .so 4 

 \ o \ 

 t o I s ° 2 + 2 H 2 °> which is a normal salt of the base of Gros. 



Pt 4 NH 3 . S0 4 

 I Br 



When two equ. of the sulphate of silver act upon the bromosulphate the compound 

 (Pt4NH 3 {o, so, )-2 ^2 i S0 2 + 3 H 2 O is obtained. In this sulphate only 2 / 3 of the sulphu- 

 ric acid is precipitable by salts of barium, and I obtained by double decomposition a 

 series of compounds containing sulphuric acid not precipitable by the chloride of ba- 

 rium. In these compounds I supposed a new base »Sulphatodiplatinamin» with the 

 equivalent formula (Pt 2 4 NH 3 , 4 S0 3 H) O H O. — By the reaction of acetate of sil- 

 ver on the bromosulphate I obtained a series of salts belonging to the base of Gros, 

 which all contain acetic acid and may be represented by the general formula 



f OH 



Pt \ 4nh 3 .x 2 , in which X = O + the radicle of a mono-basic acid. 

 | o . c 2 h 3 o 



In the latter of the two papers I described the derivates of the products, which 

 are obtained by the action of ammonia on the jodide or joclonitrate of the basis of 

 Gros. The derivates of those jodosalts are to be regarded as compounds of a new 



platinum-basis with the equ. formula Pt 2 i 4NH .2o.2Ho or the atomic formula 



( OH 

 VI I 2NH 3 .OH 

 j 2NH,.OH 

 "*S \ 2NH 3 .OH 

 I 2NH,.OIl 

 \ OH 



In his work entitled »Die Chemie der Jetztzeit» published in 1869 Professor 

 Blomstrand exposed his views on the atomical structure of the ammonia-metal-com- 

 pounds. With Claus, Genth & Gibbs and Braun he regards them as additional com- 

 pounds of ammonia with metals, but in opposition to Claus, Genth and Gibbs, he 

 assumes that the ammonia is not an inactive copula but united with the metal to an 

 active chemical radicle. This theory which closely agrees with the opinion of Braun 2 ), 

 seems to me the best of all the many different efforts to explain the chemical nature 

 of the ammonia-metal-compounds and I have not hesitated to give up the opinion, 

 maintained in my former publications, that the ammoniacal metal-compounds contain 



') Om några derivator af den Gros'ska Platinabasen l:sta afdelningen B 7 N:o 6, 2:dra afdeln. B 7 N:o 7. 

 2 ) Ann. Ch. u. Pharm. 142. 1867 p. 55 (note). 



