32 



P. T. CLEVE, 



I 



ML . I 



3. lodide Pti NH x was obtained by the action of iodine, dissolved in alcohol. 

 Ii " 



on the iodide of platosammine. The iodide is a black uncrystalline powder. 



Analysis : 

 0,5140 gr. gave 0,1370 grms metallic platinum and 0,0500 gr. iodide af silver 



0,3513 



gr. iodine. 



The formula requires: 



Theory 



Platinuni 197,88 — 26,74 



Iodine 508,oo — 68,66 



Amrnonia 34,oo — 4,60 



739,88 100,oo 



Experiment 



26,65 

 68,34 



5,01 (loss) 

 100,oo 



Pt 



The iodide when boiled with liquid ammonia yields a brownish powder containing 



37,40 p. et. platinum. The product is very likely the anhydro-iodide of diplatindiammine. 



i 



2NII 3 I 

 NH 3 ~NH 2 

 NH 5 "NH 2 + zri 2 u 

 2NH I 

 I 



This compound contains 37, oo p. et. platinum. 



The action of a concentrated solntion of hydrate of potassium upon the iodide 

 is very interesting, but I have not yet so completely finished the researches, as to be 

 perfectly sure of the chemical composition of the substances, which are produced by 

 this reaction, or that of their derivates. Being uncertain whether I can get any op- 

 portunity of continuing these researches, I shall here describe what I have observed, 

 believing that this may possibly be of some use for farther investigations. 



When the black iodide is boiled with a strong solution of potassic hydrate its 

 colour soon changes to a bright yellow; little or no ammonia is given off during this 

 operation. The composition of this product seems to vary with the strength of the 

 solution, or perhaps, with the eluration of the reaction. I have analysed the yellow, 

 well washed product, from four different preparations and obtained: 



Platinum 50,97 



Iodine 33,97 



Nitroeren ■ — 



51,19 



7,64 



3 

 63,92 



15,02 



4 



59,4 



The two first analyses agree with the formula 



i 



NH, 



Pt 



NH : 



NH; 

 NH; 



I 



>0 



>0 



+ 2H,0 



