Californium(III) bromide

Californium(III) bromide
Names
	IUPAC name Californium(III) bromide
Identifiers
CAS Number	28064-96-2; 249Cf: 24297-29-8;
3D model (JSmol)	Interactive image;
ChemSpider	28548254;
PubChem CID	249Cf: 185562;
	InChI InChI=1S/3BrH.Cf/h3*1H;/p-3 Key: NJIJEQJUGGORBI-UHFFFAOYSA-K;
	SMILES ...;
Properties
Chemical formula	Br3Cf
Molar mass	491 g·mol−1
Appearance	green solid
Structure
Crystal structure	Monoclinic, mS16
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

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]

{\ce {2 CfBr3 -> 2 CfBr2 + Br2}}

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]

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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[1] 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.

[2] 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.

[3] 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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[2]

[3]

Properties

See also

References