Mr Levy, Some New Platinocyanides. 
159 
Some Neiu Platinocyanides. By L. A. Levy, Clare College. 
(Communicated by Dr Fenton.) 
[Read 11 March 1907.] 
In the course of an investigation of the properties of platino- 
cyanides — more particularly with respect to their fluorescence — it 
has been necessary to prepare salts of bases whose constitution 
renders the gradual substitution of hydrogen by alkyl and other 
groups possible. By this means the effect of various atomic 
groupings can be estimated. To this end the platinocyanides 
of hydrazine and hydroxylamine were prepared and, as their pro- 
perties proved interesting, they were described in a paper 
published in the Journal of the Chemical Society, Jan. 1906. In 
continuation of this work, the following salts have been prepared : 
Guanidine Platin ocyanide. 
Guanidine (a base whose hydrogen atoms are readily substi- 
tuted) platinocyanide was prepared by double decomposition 
between the calculated quantities of guanidine carbonate and 
barium platinocyanide. After filtering off the precipitated 
barium carbonate and evaporating in a desiccator, long silky 
white needles, which are very soluble in water, are obtained. 
0'0569 of salt on ignition gave 0 0265 of platinum. 
Pt = 46-57 °/ 0 . 
Pt calculated for (CN 3 H 5 ) 2 H 2 Pt (CN) 4 = 46‘54 °/ 0 . 
The white crystals are therefore probably anhydrous. 
The salt does not appear to present any points of interest. 
* Nitron ’ Platinocyanide. 
Nitrogenous bases such as hydrazine and hydroxylamine yield 
interesting platinocyanides. The ‘ nitron ’ (diphenylendoanilodi- 
hydrotriazole C 20 H 1(; N 4 ) salt was prepared to see if it exhibited any 
interesting properties. It was prepared by adding, to an acetic 
acid solution of nitron, the calculated quantity of hydroplatinocyanic 
acid in aqueous solution. A buff-coloured amorphous precipitate, 
insoluble in water, was immediately produced. This was washed 
free from acetic acid, dried and dissolved in absolute alcohol. 
Shining grey lamellar crystals were deposited. 
0T612 of the salt on ignition gave 0 0350 of Pt. 
Pt = 217 %. 
Pt calculated for (C 20 H 1G N 4 ) 2 Pt (CN) 4 = 21T. 
A difference in weight of one milligram corresponds to 1'3 % Pt, 
and hence great accuracy is not to be expected. The substance 
does not exhibit any interesting properties. 
