Uranyl Platinocyanide

Uranyl Platinocyanide is formed by double decomposition between barium platinocyanide and uranyl sulphate. If the solution is crystallised at ordinary temperature, red crystals with strong green metallic reflexion are deposited; but if the solution is evaporated on a water-bath, yellow crystals separate, which turn reddish green on cooling. The latter product changes back to the yellow form at 39° C. The two forms probably represent different degrees of hydration. Unlike most uranyl salts, the platinocyanide does not fluoresce.