Zeise's salt

Kaliumtrichloridoethylenplatinat (II ) hydrate

Yellow solid

Fixed

2.88 g · cm3

220 ° C

Attention

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In the Zeise's salt is a platinum complex with the formula K [ PtCl3 ( C2H4) ] · H2O. It was discovered in 1827 by the Danish chemist William Christopher Zeise and is regarded as one of the first synthesized organometallic compounds.

Representation and extraction

Zeise received the complex by boiling Kaliumtetrachloridoplatinat (II ) ( K 2 [ PtCl 4 ] ) in ethanol. This water then separates from ethanol from under the formation of ethene. This then coordinated to the platinum center and forms the Zeise's salt.

Zeise postulated at that time that the salt formed ethene contained. However, this could not be confirmed until decades later, was brought as Kaliumtetrachloridoplatinat (II ) with ethene to the reaction and the same salt was obtained.

Structure

In Zeise's salt, the central platinum ion is coordinated square-planar. In the solid state the Ethylenligand is perpendicular to this plane, in solution, however, it rotates about the σ - bond to the metal ion. By elimination of the potassium chloride dimer Zeise salt can be obtained.