ON AMMONIACAL PLATINUM BASES. 103 



II. Dichromic-mono-diammine. 



R=Cr 2 <2NH 3 (Dichrome-heptammine Cleve formerly) 

 |2nh 3 



1. Nitrate with nitrate of ammonium 2(R . 6 . 6N0 2 )+2(NH 4 . O. N0 2 )+9H 2 



_ , . „fO,.2NO, 



2. Oxalomtrate R\r\ *n f\ + 2Jd 2 U 



fb.C~A.OHx 



3. Acid oxalate 2(R 4 . 2C 2 2 1+3H.0 



[o.C 2 2 .OH' 



j NH 3 



R=C 2 |2nh 3 (Chrom-triammine Cleve formerly) 

 ' NH 3 . 



Oxalate R . 6 . 3C 2 2 + 3H 2 0. 



jNH 3 



III. Dichromium-monammine R=Cr 2 < NH 3 



Uh 3 

 Only sonie double sulphocyanates are known by Mr Reinecke. They seem to 

 have the general formula 



(CNSR 



|nii,| 



NH 3 

 CNSR 



in which R signifies one atom of a monatomic metallic element. 



P. Ammoniacal compounds of mercury. 



Mercuricum as well as mercurosum are able to form ammoniacal compounds. 

 They have a great tendency to change to amido-mercury compounds. The latter seem 

 to be analogous to the anhydro-compounds of diplatin-diammine. Also some compo- 

 unds of mercury may be regarded as containing mercury united with nitrogen in the 

 radicle, in exact analogy, as I hold, with the radicle in the hyperosmic acid. 



The great nnmber of compounds which contain as radicles ammonia, amide or 

 nitrogen united with mercury, may be arranged in the following manner. 



I. Compounds of Mercuricum Hg". 



(NHa 



a. Ammmes or ammomo-compounds R"=Hg(NH 3 ) 2 or Hgi^r^ 



b. Amido-compounds R'^HgNH_. 



H"g| 



c. Nitrilo-compoiénds R'= u-^fN'" 



