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Californium(II) iodide is a binary inorganic compound of californium and iodine with the formula CfI
₂.

Synthesis

It can be produced by reducing californium triiodide with hydrogen in a quartz thin tube at 570 °C:

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.

Californium diiodide has two crystal structures, one is CdCl
₂-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 CdI
₂-type with lattice parameters a = 455.7 ± 0.4 pm and c = 699.2 ± 0.6 pm. Californium diiodide has an absorption band in the wavelength range from 300 to 1100 nm, which proves the existence of Cf(II).

References

1. "WebElements Periodic Table » Californium » californium dioxide". webelements.com. Retrieved 11 April 2023.
2. Stuart, Sam (11 September 2013). XXIVth International Congress of Pure and Applied Chemistry: Plenary and Main Section Lectures Presented at Hamburg, Federal Republic of Germany, 2–8 September 1973. Elsevier. p. 117. ISBN 978-1-4832-7868-1. Retrieved 11 April 2023.
3. Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 2826. ISBN 978-0-412-30120-9. Retrieved 11 April 2023.
4. Wild, J. F.; Hulet, E. K.; Lougheed, R. W.; Hayes, W. N.; Peterson, J. R.; Fellows, R. L.; Young, J. P. (1 January 1978). "Studies of californium(II) and (III) iodides". Journal of Inorganic and Nuclear Chemistry. 40 (5): 811–817. doi:10.1016/0022-1902(78)80157-2. ISSN 0022-1902. Retrieved 11 April 2023.

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