34 



Platinum 36,02 



Iodine 57,79 



But the coincidence may perhaps only have been accidental, when, 011 another occasion, 

 I obtained in the same manner a black precipitate containing only 32,61 p. et. plati- 

 num, which agrees with the formula Pt 2 . 4NH 3 . I (; . 



The yellow produet obtained by boiling the iodide Pt . 2NH 3 . I 4 with alkali was 

 treated with hydroiodic acid, when it was transformed to a black, uncrystalline powder, 



I 1 



NH., 1 

 vi I 3 



having the composition of the formula Pt.!* 3 or the iodide of diplatin-ammine 



fm,. 



Found Calculated 



Platinum 32,69 32,29 



Iodine 61,64 62,12 



For the preparation of the iodide of diplatin-ammine I employed the yellow io- 

 dide which contained 63,92 p. et. platinum. 



The iodide of the diplatinammine thus obtained is a black uncrystalline powder. 

 1 have not tried to prepare compounds of the new base. 



When the iodide of diplatinammine was boiled with a solution of potash-lye a 

 yellow powder was obtained, which was treated with hydro-iodic acid, first boiled with 

 the acid for a short time, and then left for 12 hours with an excess of the acid. 



The black uncrystalline powder thus obtained gave by analysis 36,79 p. et. pla- 

 tinum. It was again treated with hydroiodic acid and gave by analysis 



Platinum 36, 02 



Iodine 57,70 



X 



The jodide of the unknown base tetra-platinammine. Pt 4 8NH ?i . I 10 requires 



Platinum 36,02 



Iodine 57,79 



The produet was afterwards boiled with a very concentrated hydroiodic acid and 

 the produet, thus treated, contained only 30,7 p. et. platinum. From these facts it may 

 be inferred either that the coincidence of the numbers found by the analysis with those 

 calculated from the formula was accidental, or else, as I consider more probable, that 

 the black powder really was the iodide of tetraplatin-ammine, but that the connection 

 between the atoms of platinum was broken off by the action of hydrojodic acid by a 

 reaction, similar to that which this acid sometimes has upon combined atoms of car- 

 bon. When the supposed iodide of tetra platine-ammine was boiled with soda-lye a 

 yellow powder was obtained. It was well washed and treated with hydroiodic acid. 

 The black powder thus prepared gave according to the analysis: 



