88 P. T. CL EVE, 



Some compounds of palladiura containing triethylphosphine and triéthylarsine are 

 also known by Cahours & Gal x ) Their formulas appear to be: 



J2P(C 2 H 6 ) 3 .C1 /2As(C 2 H 5 ) 3 .Cl 



Pd lci Pd lcl 



D. Ammoniacal compounds of Iridium. 



According to Skoblikoff 2 ) diatoraic Iridium gives with ammonia two radicles cor- 

 responding with platodiammine and also, in all probability, with platosammine. Com- 

 pounds of a radicle containing tetra-atomic iridium and corresponding with platindi- 

 aminine are likewisc known by .the same author. Mr Claus 3 ) has deseribed ammonia 

 compounds of hexatomic di-iridium. 



The compounds of iridosammine of Mr Skoblikoff are prepared from the chlo- 

 ride Ir . 2NPL . CL, which was obtained by the action of hydrochloric acid upon the 



chloride of iridosdiammine, consequently from Irj 2NH by the loss of 2NH 3 . From the 

 analogy with the compounds of platinum I think it very likely that the iridosammine 



i \' rj 



has the formula Ii'|kh J . The chloride Ir2NH 3 . Cl 2 mixed with sulphuric acid gives the 

 sulphate of iridosammine, but Skoblikoff states that when treated with nitric acid it 



i • 111 • t |2NH 3 .0N0 2 rr, • t • i i • i t 



also gives the cnloromtrate D'|2xii. .ono •'■" 1S hitter reaction cannot be explamed it 



Ici 



the chlorides formula is In NH 3 C ] w hich does not contain diammonia. The formula is 



consequently somewhat doubtful. 



TIIK AMMONIACAL COMPOUNDS OF IRIDIUM ARE DERIVED FROM THE 



FOLLOWING RADICLES: 



1. Iridosammine (Skoblikoff) Irj NH 3; =R 



2. Iridosdiammine (Skoblikoff) Ir^Nti ~^ 



3. Iridid-diammine (Skoblikoff) Itwh 3 = ^ 



f2NH, 



VI 3NH 



4. Diiridid-di-triammine (Claus) ItWnh 3 = R. 



12NH, 



I. Compounds of iridosammine. 



1. Chloride RC1, 



2. Sulphate R . S0 4 



II. Compounds of iridosdiammine. 



1. Chloride RC1, 



2. Sulphate R . SO t 



3. Nitrate R . 2N0 3 (not analysed). 



1 ) Cahurs & Gal, Journ. of Pr. Ch. N. F. 2 187 p. 460. 



2 ) Skoblikoff Ann. dur Ch. u. Fharm. 84. p. 275. 1852. 



;i ) Claus Beiträge zur Ch. der Platin-Metnlle Dorpat. 1854. p. 90. 



