ON AMMONIACAL PLATINUM B ÅSES. 107 



Only one aniraoniacal-compound of inanganese is known, wiz: Mn|2 NH 3 fS0 2 1 ). 

 Of the electro-negative metals (tin, antimony, bismuth and arsenic) are also known 

 some few ammoniacal compounds. 



These compounds are: 



Sn, 2NH ;! , Cl 4 (Rose) 



Sn, 2NH 3 I 2 ? (Rammelsbekg) 



Sn, 2(C e H T N).Cl,(H. Schiff) Sb, 2C 6 H 7 N, 1, (Schiff), 



Bi, 3(C t; H 7 N), Cl 3 (Schiff) Sb, 3C fi H 7 N, Cl 3 (Schiff) 



R . rnw O Sb, NH 3 , C1 3 (Rose) 



Bi, C G H 7 \ |C1 (Schiff) ^ ^^ a (Schiff) 



Nearly related to the aramonia-metal-derivates are the compounds between the 

 chlorides of tin, titanum, gold, iron, antimony, etc. and hydrocyanic acid, aceto-nitrile, 

 chloride of cyauogen, etc, '"') all belonging to the type of ammonia. 



In organic chimistry real analogies with the ammonia-metal bases are rare. The 



Cholinc whose formula according Streckkk :! ) is C 2 H 4 | N(CH) H and perhaps some of 

 the aminonio-derivates of ethylene seem to have an atomical eomposition, elosely re- 

 sembling that of the ammoniacal metal-compounds. 



From this rewiew of all known ammoniacal corapoimds of different metals it will 

 be seen that: 



l:o. The highest number of molecules of ammonia, which occur united toge- 

 ther in ammoniacal compounds, is 4. Tetrammines of calciuin and strontinm and per- 

 haps of cuprosum, are as yet, the only ones known. 



2:o. Triammines are formed by calciuin, magnesium, cobalt, nickel, zinc, cad- 

 mium, sih r er, rhodium and iridium. Copper scarcely seems likely to form triammines. 



3:o. Diamuiines are produced by most metals, as by platinum, tin, chronium etc. 

 If mereury forms diammines or only monammines, i> for the present impossible t<> 

 decide. 



4:o. Consecpiently, as a rule, the most positi\e metals seem to have the power 

 to unite the greatest number of molecules of ammonia, but more negative metals, such 

 as platinum, form the most stable amoniacal compounds. 



J ) Rose, Pogg. Ann. 20. p. 148. 1830. 2 ) Sce. Klein, Ann. Ch. Pharm. 78. p. 86. Wöhler, Ann. Cli. 

 Pharm. 73. p. 226. Henke, Ann. Ch. Pharm. 106. p. 281. :i ) Streckeu, Ann. Ch. Pharm. 148. p. 77. IHtis 



