Chemistry:Californium(III) bromide
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| IUPAC name
Californium(III) bromide
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3D model (JSmol)
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| Properties | |
| Br3Cf | |
| Molar mass | 491 g·mol−1 |
| Appearance | green solid |
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| Monoclinic, mS16 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Californium(III) bromide is an inorganic compound, a salt with a chemical formula CfBr3. Like in californium oxide (Cf2O3) and other californium halides, including californium(III) fluoride (CfF3), californium(III) chloride, and californium(III) iodide (CfI3), the californium atom has an oxidation state of +3.
Properties
Californium(III) bromide is shown to crystallize in both the AlCl3 and FeCl3 type structures. In the former structure, the californium ion is six coordinated and the three independent Cf-Br bond lengths are 279.5±0.9 pm, 282.7±1.1 pm, and 282.8±0.8 pm.[1]
Californium(III) bromide partially decomposes into californium(II) bromide under high temperature.[2]
- [math]\ce{ 2 CfBr3 ->[\Delta T] 2 CfBr2 + Br2 }[/math]
In the radioactive decay of berkelium-249 to californium-249, the oxidation number and crystal structure are preserved. The six-coordinate berkelium(III) bromide (AlCl3-type monoclinic structure) decays to produce a six-coordinate californium(III) bromide, whereas an eight-coordinate berkelium(III) bromide (PuBr3-type, orthorhombic structure) produces an eight-coordinate californium(III) bromide.[3]
See also
References
- ↑ Burns, John H.; Peterson, J.R.; Stevenson, J.N. (March 1975). "Crystallographic studies of some transuranic trihalides: 239PuCl3, 244CmBr3, 249BkBr3 and 249CfBr3". Journal of Inorganic and Nuclear Chemistry 37 (3): 743–749. doi:10.1016/0022-1902(75)80532-X.
- ↑ Young, J. P.; Vander Sluis, Kenneth L.; Werner, G. K.; Peterson, J. R.; Noé, M. (December 1975). "High temperature spectroscopic and X-ray diffraction studies of californium tribromide: Proof of thermal reduction to californium(II)". Journal of Inorganic and Nuclear Chemistry 37 (12): 2497–2501. doi:10.1016/0022-1902(75)80878-5.
- ↑ Young, J. P.; Haire, R. G.; Peterson, J. R.; Ensor, D. D.; Fellows, R. L. (1980-08-01). "Chemical consequences of radioactive decay. 1. Study of californium-249 ingrowth into crystalline berkelium-249 tribromide: a new crystalline phase of californium tribromide". Inorganic Chemistry 19 (8): 2209–2212. doi:10.1021/ic50210a003.
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