Californium (II) iodide

Crystal structure
	__ Cf 2+ __ I -
Crystal system	rhombohedral
Lattice parameters	a = 743.4 ± 1.1 pm
General
Surname	Californium (II) iodide
other names	Californium diiodide
Ratio formula	CfI 2
Brief description	deep purple solid
External identifiers / databases
Wikidata	Q1026963
properties
Molar mass	504.89 g mol −1
Physical state	firmly
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Californium (II) iodide is an iodide of the artificial element and actinoid californium with the molecular formula CfI ₂ . It is a deep purple solid and could be produced in microgram quantities under high vacuum . It is produced from californium (III) iodide (CfI ₃ ) by reduction with highly pure hydrogen (H ₂ ) at 570 ° C in a quartz capillary:

{\ displaystyle {\ ce {2 CfI3 + H2 -> 2 CfI2 + 2 HI}}}

At slightly higher temperatures it melts and reacts with the silicon dioxide of the glass walls, whereby u. a. CfOI educates.

It has two crystalline modifications: a rhombohedral structure of the CdCl ₂ type which is stable at room temperature with a = 743.4 ± 1.1 pm and α = 35.83 ± 0.07 °, and a trigonal , metastable structure of CdI ₂ -Type ( polytype 2H) with a = 455.7 ± 0.4 pm and c = 699.2 ± 0.6 pm. The optical spectra show absorption bands in the wavelength range from 300 to 1100 nm, which confirm the presence of Cf (II).

Individual evidence

↑ ^a ^b ^c J. F. Wild, EK Hulet, RW Lougheed, WN Hayes: Preparation of Californium Diiodide , Symposium Commemorating the 25th Anniversary of the Discovery of Elements 97 and 98; January 20, 1975; Berkeley, USA.
↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.
↑ ^a ^b ^c ^d J. F. Wild, EK Hulet, RW Lougheed, WN Hayes, JR Peterson, RL Fellows, JP Young: Studies of Californium (II) and (III) Iodides , in: J. Inorg. Nucl. Chem. , 1978 , 40 (5), pp. 811-817 ( doi: 10.1016 / 0022-1902 (78) 80157-2 ).

literature

Richard G. Haire: Californium , in: Lester R. Morss, Norman M. Edelstein, Jean Fuger (Eds.): The Chemistry of the Actinide and Transactinide Elements , Springer, Dordrecht 2006; ISBN 1-4020-3555-1 , pp. 1499-1576 ( doi: 10.1007 / 1-4020-3598-5_11 ).

[CfI2-1] J. F. Wild, EK Hulet, RW Lougheed, WN Hayes: Preparation of Californium Diiodide , Symposium Commemorating the 25th Anniversary of the Discovery of Elements 97 and 98; January 20, 1975; Berkeley, USA.

[NV-2] The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.

[STUDIES-3] J. F. Wild, EK Hulet, RW Lougheed, WN Hayes, JR Peterson, RL Fellows, JP Young: Studies of Californium (II) and (III) Iodides , in: J. Inorg. Nucl. Chem. , 1978 , 40 (5), pp. 811-817 ( doi: 10.1016 / 0022-1902 (78) 80157-2 ).