Neptunium tetrabromide is a binary inorganic compound of neptunium metal and bromine with the chemical formula NpBr4.

[1][2][3][4] The compound can be prepared from the reaction of bromine with metallic neptunium: Also, a reaction of aluminum bromide with neptunium(IV) oxide:[5][6] Neptunium tetrabromide forms red-brown hygroscopic crystals of monoclinic crystal system, spatial group P 2/c,[7][8] cell parameters a = 1.089 nm, b = 0.874 nm, c = 0.705 nm, β = 95.19°, Z = 4.

[9] NpBr4 is easily purified by sublimation in a vacuum.

[10] Decomposes under strong heating to form neptunium tribromide: With careful oxidation with antimony(III) oxide, the compound forms neptunium oxidibromide: This inorganic compound–related article is a stub.

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