Californium(II) iodide
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| ImageFile =
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| IUPACName =
| OtherNames = Californium diiodide
| Section1 = {{Chembox Identifiers
| CASNo = 49774-08-5
| PubChem =
| ChemSpiderID =
| EINECS =
| DTXSID =
| SMILES = [Cf+2].[I-].[I-]
| StdInChI = 1S/Cf.2HI/h;2*1H/q+2;;/p-2
| StdInChIKey = VNDYPDFEICMTGA-UHFFFAOYSA-L
}}
| Section2 = {{Chembox Properties
| Cf=1|I=2
| Appearance = dark purple solid
| Density = g/cm3
| Solubility = insoluble
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| Section4 = {{Chembox Structure
| CrystalStruct = cubic
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| Section7 = {{Chembox Hazards
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|Section6={{Chembox Related
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Californium(II) iodide is a binary inorganic compound of californium and iodine with the formula {{chem|Cf|I|2}}.{{cite web |title=WebElements Periodic Table » Californium » californium dioxide |url=https://www.webelements.com/compounds/californium/californium_dioxide.html |publisher=webelements.com |access-date=11 April 2023}}
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Synthesis
It can be produced by reducing californium triiodide with hydrogen in a quartz thin tube at 570 °C:{{cite book |last1=Stuart |first1=Sam |title=XXIVth International Congress of Pure and Applied Chemistry: Plenary and Main Section Lectures Presented at Hamburg, Federal Republic of Germany, 2–8 September 1973 |date=11 September 2013 |publisher=Elsevier |isbn=978-1-4832-7868-1 |page=117 |url=https://books.google.com/books?id=dTIXBQAAQBAJ&dq=Californium+diiodide&pg=PA117 |access-date=11 April 2023 |language=en}}
::{{chem2|2CfI3 + H2 -> 2CfI2 + 2HI}}
Physical properties
The compound forms a dark purple solid. At slightly higher temperatures, it melts and reacts with the silica in the thin tube, producing CfOI.{{cn|date=September 2023}}
Californium diiodide has two crystal structures, one is Cadmium(II) chloride-type crystal structure, stable at room temperature, with lattice parameters a = 743.4 ± 1.1 pm and α = 35.83 ± 0.07°; the other is metastable, of {{chem|Cd|I|2}}-type with lattice parameters a = 455.7 ± 0.4 pm and c = 699.2 ± 0.6 pm.{{cite book |last1=Macintyre |first1=Jane E. |title=Dictionary of Inorganic Compounds |date=23 July 1992 |publisher=CRC Press |isbn=978-0-412-30120-9 |page=2826 |url=https://books.google.com/books?id=9eJvoNCSCRMC&dq=Californium+diiodide&pg=PA2826 |access-date=11 April 2023 |language=en}} Californium diiodide has an absorption band in the wavelength range from 300 to 1100 nm, which proves the existence of Cf(II).{{cite journal |last1=Wild |first1=J. F. |last2=Hulet |first2=E. K. |last3=Lougheed |first3=R. W. |last4=Hayes |first4=W. N. |last5=Peterson |first5=J. R. |last6=Fellows |first6=R. L. |last7=Young |first7=J. P. |title=Studies of californium(II) and (III) iodides |journal=Journal of Inorganic and Nuclear Chemistry |date=1 January 1978 |volume=40 |issue=5 |pages=811–817 |doi=10.1016/0022-1902(78)80157-2 |url=https://www.sciencedirect.com/science/article/abs/pii/0022190278801572 |access-date=11 April 2023 |language=en |issn=0022-1902|url-access=subscription }}
References
{{reflist}}
{{Californium compounds}}
{{Iodides}}
{{Actinide halides}}
Category:Californium compounds
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