ON AMMONIACAL PLATINUM BASES. 83 



thus corresponding with the chloride of platinammine. This chloride, with the tetra- 

 chloride of platinum and chlorhydrate of pyridine, gives a eonipound, to which Mr. 

 Blomstrand assigns the formula: 



|nH 5 C 8 C1~CiL fCl.~Cl NH fi 

 I ML, C\ Cl~ClP MCl.~Cl.XrL 



IC1 



This forinula is very remarkable and it has no analogies among the chloro- 

 platinates. 



Compounds of pyridine corresponding to the compounds of platosammine also 

 exists, \\/.: 



the chloride Pt{™^|Cl 2 



the chloride PtjJJJq^O, . Cr 2 . 

 H. Picoline-compound Mr. Anderson also obtained a compound of picoline: 



p |nc„il Cl~Cllp |C1~C1 (NH 8 ( 

 •■ •'jNCgHjCl^Clp tjd^Cl.fXH, C 3 ) 



I consider this atomical formula somewhat uncertain, because double chlorides 

 of four-atomic platinum, in which all the four atoms of chlorine are trivalent, are 

 otherwise unknown. 



IV. Bases of platinum, which instead of ammonia or ammonia-bases contain 

 compounds of the type of ammonia or other diatomic compounds. 



M. Hofman ') first gave an account of the cxistence of bases of platinum contai- 

 ning triethylphosphine, triethyl-arsine or triethvl-stibine, the chlorides of which have 

 the formulas 



Pt2P(C,H 5 ) 3 .Cl, 

 Pt2As(C 2 H 6 ) 3 .Cl 2 

 Pt2Sb(C 2 H 5 ) 3 . Cl 2 

 Some time ago some interesting compounds belonging to the same group of com- 

 pounds of platinum were described by Cahours and Gal 2 ), who by the action of te- 

 trachloride of platinum upon triethylphosphine obtained a yellow chloride Pt2P(C 2 H 5 ) 3 

 . Cl 2 , soluble in an excess of triethylphosphine, and thus forming the chloride Pt4P 

 (C 2 H 5 ) 3 . Cl 2 , which, by the loss of 2 mol. P(C 2 H 5 ).j, is transformed to a white compo- 

 und Pt2P(C 2 H 3 ) 3 . CL, isomeric with the chloride first obtained. It is exactly the same 

 series of metamorphoses, as that, which takes place by the action of ammonia upon the 



■ -)| I TT pl 



protochloride of platinum, when the chloride of platosemidiammine Pt{ C] is for- 



f2NH Cl 

 med first; this dissolved in ammonia yields the chloride of platodiammine Pt o XH 3 ' C] 



and by the loss of ammonia this yields the chloride of platosammine Pt{ XII 3 ' CI The 



*) Hovman Ann. der Ch. u. Phavm. CLII p. 357. 1857. 



2 ) Cahouks and Gal Journ. f. p. Ch. (X. F.) 2. p. 213 and p. 460 1870. Kolbe 1. c. p. :217 



