View source for Californium(III) bromide

{{Chembox
| Name           = Californium(III) bromide
| ImageFile      = Cf_bromid.jpg
| OtherNames     =
| IUPACName      = Californium(III) bromide
| SystematicName =
| Section1={{Chembox Identifiers
| index1_label=<sup>249</sup>Cf
| CASNo = 28064-96-2
| CASNo1 = 24297-29-8
| ChemSpiderID = 28548254
| PubChem1= 185562
| SMILES = [Br-].[Br-].[Br-].[Cf]
| StdInChI=1S/3BrH.Cf/h3*1H;/p-3
| StdInChIKey = NJIJEQJUGGORBI-UHFFFAOYSA-K
 }}
| Section2       = {{Chembox Properties
| Appearance = green solid
| Cf=1 | Br=3
}}
|Section3={{Chembox Structure
| CrystalStruct = [[Monoclinic]], [[Pearson symbol|mS16]]
}}
}}

'''Californium(III) bromide''' is an [[inorganic compound]], a salt with a [[chemical formula]] CfBr<sub>3</sub>. Like in [[californium(III) oxide]] (Cf<sub>2</sub>O<sub>3</sub>) and other californium halides, including californium(III) fluoride (CfF<sub>3</sub>), [[californium(III) chloride]], and californium(III) iodide (CfI<sub>3</sub>), the californium [[atom]] has an [[oxidation state]] of +3.

== Properties ==
Californium(III) bromide is shown to crystallize in both the [[Aluminum chloride|AlCl<sub>3</sub>]] and [[Iron(III) chloride|FeCl<sub>3</sub>]] 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.<ref>{{cite journal |last1=Burns|first1=John H.|last2=Peterson|first2=J.R.|last3=Stevenson|first3=J.N.|date=March 1975|title=Crystallographic studies of some transuranic trihalides: <sup>239</sup>PuCl<sub>3</sub>, <sup>244</sup>CmBr<sub>3</sub>, <sup>249</sup>BkBr<sub>3</sub> and <sup>249</sup>CfBr<sub>3</sub>|url= |journal=Journal of Inorganic and Nuclear Chemistry|volume=37|issue=3|pages=743–749|doi=10.1016/0022-1902(75)80532-X|access-date=}}</ref>

Californium(III) bromide partially decomposes into californium(II) bromide under high temperature.<ref>{{cite journal |last1=Young|first1=J. P.|last2=Vander Sluis|first2=Kenneth L.|last3=Werner|first3=G. K.|last4=Peterson|first4=J. R.|last5=Noé|first5=M.|date=December 1975|title=High temperature spectroscopic and X-ray diffraction studies of californium tribromide: Proof of thermal reduction to californium(II)|url= |journal=Journal of Inorganic and Nuclear Chemistry|volume=37|issue=12|pages=2497–2501|doi=10.1016/0022-1902(75)80878-5|access-date=}}</ref>

:<chem>2 CfBr3 ->[\Delta T] 2 CfBr2 + Br2</chem>

In the radioactive decay of [[berkelium]]-249 to californium-249, the oxidation number and crystal structure are preserved. The six-coordinate berkelium(III) bromide (AlCl<sub>3</sub>-type monoclinic structure) decays to produce a six-coordinate californium(III) bromide, whereas an eight-coordinate berkelium(III) bromide ([[Plutonium(III) bromide|PuBr<sub>3</sub>]]-type, orthorhombic structure) produces an eight-coordinate californium(III) bromide.<ref>{{cite journal |last1=Young|first1=J. P.|last2=Haire|first2=R. G.|last3=Peterson|first3=J. R.|last4=Ensor|first4=D. D.|last5=Fellows|first5=R. L.|date=1980-08-01|title=Chemical consequences of radioactive decay. 1. Study of californium-249 ingrowth into crystalline berkelium-249 tribromide: a new crystalline phase of californium tribromide|journal=Inorganic Chemistry|volume=19|issue=8|pages=2209–2212|doi=10.1021/ic50210a003}}</ref>

== See also ==
* [[Californium]]
* [[Californium compounds]]

== References ==
{{Reflist}}

{{Californium compounds}}
{{Bromides}}
{{Actinide halides}}

[[Category:Californium compounds]]
[[Category:Actinide halides]]