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.
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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 |
| Structure | |
| 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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Properties edit
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]
![{\displaystyle {\ce {2 CfBr3 ->[\Delta T] 2 CfBr2 + Br2}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/062d1518dc82fcbfc0ee0fe5d9e89f34653c012d)
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 edit
References edit
- ^ 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.