ON AMMONIACAL PLATINUM BASES. 9 



B. COMPOUNDS OF PLATINDIAMMINE. 



Platindiammine, or the base of Gros, is a tetra-atomic basis. Of the four units 

 of affinity of its radicle, two belong to platinum and two to diammonia united with 





b 



platinum. The radicle may be written thus Pt 7, .-,/,, a' a" and b' b" expressing 



its four units of affinity. The chemical funetions of a' a" and b' b" are very different. 

 When a radicle (chlorine, hydroxyl, oxygen and acid radicles etc.) is united to a' or a" 

 it becomes very firraly fixed and cannot generally be easily exchanged by donble de- 

 coinposition, but when those radicles are united with b' or b" they may be exchanged 

 by double decomposition almost as easily as if they were combined with ammonium or 

 potassiuni. 



The numerous compounds of platindiammine may be arranged in several groups, 

 accordins to the different radicles combined with a' or a". 



I. Chloro-platindiammine R == Pt 



Cl 



2 N H, 

 2 X H 3 



Cl 



1. Chloride R Cl 2 ') 



2. Chlor opiat Lnate R CLTCl, Pt Cl 2 2 ) or R Cl 6 Pt + H, O 3 ). 



3. Chlproplatinite R CLTCL Pt 4 ). 



4. Sulphocyanate 2 R (Cy S), + 3 H, O ? "'). 



5. Nitrate R . 2 N 3 G ). 



6. Sulphate R . S 4 ')■ 



7. Oxalate R . C 2 4 8 ). 



8. Chromate a. R . Cr O, :l ). 



b. R.0 2 .Cr 2 5 l0 ). 



II. Bromo-platindiammine R == Pt 



1. Bromide R Br, 1X ). 



2. Nitrate R.2N0 3 iJ ). 



3. Sulphate R . S 4 13 ). 



4. Oxalate R . C, 4 14 ). 



Br 



2 X H 3 

 2 N H, 

 Br 



') Geos Ann. CL u. Pharm. 27, 1838, p. 249. Gerhardt Ann. Cli. u. Pharm. 76 p. 312. 1850. 2 ) Cleve 



Am. Plåt. För. p. 47. 3 ) Gerhardt 1. c. p. 314. Grimm Ann. C Ii. u. Pharm. 99 p. 73 1856. 4 ) Reiset 



Ann. de Ch. et de Phys. (3) 11. 1844 p. 429. Cleve 1. c. 27 & 47. 5 ) Cleve 1. c. p. 57. 6 ) Gros 



1. e. p. 245. Cleve 1. c. p. 77. Hadow 1. c. p. 345. 7 ) Gros 1. c. p. 250. Cleve 1. c. p. 91. 



8 ) Gros 1. c. p. 252. Cl. 1. c. p. 93. 9 ) Cl. 1. c. p. 94. I0 ) Cl. 1. c. p. 99. ll ) Cl. 1. c. p. 48. 

 l2 ) Cl. \. c. p. 86. 13 ) Cl. 1. c. p. 92. M ) Cl. 1. c. p. 94. 



K. Vet. Akad. Handl. B. 10. N:o 9. 9 



