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Chemical compound From Wikipedia, the free encyclopedia
Neptunium(III) bromide is a bromide of neptunium, with the chemical formula of NpBr3.
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Identifiers | |||
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3D model (JSmol) |
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Properties | |||
Br3Np | |||
Molar mass | 477 g·mol−1 | ||
Appearance | green solid[1] | ||
Density | 6.62 g·cm−3[2] | ||
Structure | |||
α-NpBr3: hexagonal β-NpBr3: orthorhombic | |||
α-NpBr3: P63/m (No. 176) β-NpBr3: Ccmm (No. 63) | |||
a = 791.7 pm (α), 411 pm (β), b = 791.7 pm (α), 1265 pm (β), c = 438.2 pm (α), 915 pm (β) | |||
Related compounds | |||
Other anions |
neptunium(III) fluoride neptunium(III) chloride neptunium(III) iodide | ||
Other cations |
uranium(III) bromide plutonium(III) bromide | ||
Related compounds |
neptunium(IV) bromide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Neptunium(III) bromide can be prepared by reacting neptunium dioxide and aluminium bromide:[3]
Neptunium(III) bromide is a green solid. It can crystallize in two crystal systems:
Neptunium(III) bromide also has a green hexahydrate, which is monoclinic.[3]
At 425 °C, neptunium(III) bromide bromide can be further brominated by bromine to form neptunium(IV) bromide.[2]
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