Abstract
A reversible colour change from lemon-yellow to orange was observed for polycrystalline UO 2 (hfa) 2 NH 3 at 100°C (hfa = (1,1,1,5,5,5-hexafluoro-2,4-pentanedione)). The changes in the X-ray powder pattern between −196° and 130°C were followed with a Guinier-Simon focussing camera. The colour change was not due to an α ⇌ β type structural transition as found earlier in α and β- UO 2 (hfa) 2 tmp (tmp = trimethyl phosphate), but was considered to be due to changes in the hydrogen bonding of the ammonia molecules.
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