Palladium salts, ammino-derivatives

Ammino-derivatives of Ruthenium Halides—Derivatives of Ruthenium Salts containing a Nitroso-group—Ammino-derivatives of Rhodium Salts— Ammino-derivatives of Palladium Salts. 

All three metals of this group give rise to ammino-derivatives the compositions of which, however, differ considerably. The ammino-derivatives of ruthenium mostly contain a nitroso-group as well as ammonia the ammino-derivatives of rhodium salts closely resemble the cobalt -ammines and the ammino-derivatives of palladium salts correspond to the ammino-derivatives of platinum salts. 

Ammonia combines with palladium salts, yielding ammino-com-pounds. These are, however, mostly derivatives of the stable palladous salts. Thus the two principal groups of the ammino-derivatives of palladium are the pallados-ammines or diammino-palladium compounds, 1 Jorgensen, J. prald. Ohem., 1886, 34, 396. 2 Jorgensen, ibid., 1883, 27, 478. 

The first ammino-derivative of palladium was prepared by Vauquclin in 1813.1 Vauquelin s salt, the chloropalladite of tetranunino-palladium, [Pd(NH3)4]PdCl1, corresponds to the green salt of Magnus, the first known compound of the ammino-platinum salts. 

Ammino-derivatives of palladic salts are unknown, but pyridine derivatives containing tetravalent palladium have been described. The substances are easily obtained by the oxidation of dichloro-di-pyridino-palladium. 

Ammonia unites readily with iridium salts, giving rise to complex ammino-derivatives. The first compounds described appear to be ammines analogous to those of palladium and platinum, to which they were compared by Berzelius 8 and Skoblikoff.4 A further series were described by Claus 5 wliich he represented like those of ammino-rhodium salts, as they bore a marked resemblance to these. After Jorgensen had established the constitution of the ammines of rhodium, cobalt, and chromium salts, Palmaer gave similar constitution to the iridium compounds. 

In these the metal is divalent, tetravalent, and trivalent respectively. The ammino-iridous and the ammino-iridic salts correspond to the ammino-derivatives of palladium and platinum, whilst those of the sesqui-salts are analogous to the ammino-derivatives of cobalt, chromium, and rhodium. 

Cobalt, rhodium, and iridium are also characterised by their power of yielding complex ammino derivatives, and in this manner resemble palladium and platinum. These derivatives are a remarkable series of substances entirely distinct in most of their properties from the more usual inorganic salts of the metals in question, and are dealt with separately in Volume X of this Series. 

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See also in sourсe #XX -- [ ]

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