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Uranyl Platinocyanide, UO2.Pt(CN)4

Uranyl Platinocyanide, UO2.Pt(CN)4.4(or 5)H2O, has been prepared by double decomposition of solutions of uranyl sulphate and barium platinocyanide. The green, filtered solution, upon evaporation at room temperature in a desiccator, deposits red crystals possessing a strong green metallic reflection.

If, however, the solution is concentrated on the water-bath, a yellow crystalline substance is obtained, which passes into the red-green form on cooling. Probably these changes are consequent upon variation in hydration.

The temperature of transformation of the red-green hydrate to the yellow salt is 39° C.

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