Neptunyl fluoride is an inorganic compound of neptunium, oxygen, and fluorine with the chemical formula .
Synthesis Neptunyl fluoride can be obtained by the reaction of the hydrated trioxide with gaseous HF and by direct fluorination of at 350 °C or at 225 °C.
Physical properties The compound forms a pink solid of hexagonal crystal system, spatial group R3m. Soluble in water, insoluble in common organic solvents.
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