Uranyl platinocyanide

It is certainly very remarkable that uranyl platinocyanide should fail to respond to the stimulus of ultra-violet light or to radium radiations. Both the uranyl and the platinocyanide groups can confer the property of fluorescence upon salts containing them, yet when they both occur in the same complex, there is no sign of fluorescence. 

Uranyl Platinocyanide, U02.Pt(CN)4.4(or 5)H20, has been prepared 6 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. 

Fluorescence.—The majority of platinocyanides fluoresce under the stimulus of ultra-violet light1 or of radium radiations, although some salts show no sign of this property. Magnesium, erbium, yttrium, thallium and uranyl salts are cases in point. 

---