Californium (IV) fluoride

Crystal structure
__ Cf 3+      __ F -
Crystal system	monoclinic
Space group	C 2 / c (No. 15)
General
Surname	Californium (IV) fluoride
other names	Californium tetrafluoride
Ratio formula	CfF 4
Brief description	light green solid
External identifiers / databases
CAS number 42845-08-9 Wikidata Q1026975
properties
Molar mass	327.07 g mol −1
Physical state	firmly
Hazard and safety information
Radioactive
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 (IV) fluoride is a fluoride of the artificial element and actinoid californium with the empirical formula CfF ₄ . Californium occurs in this salt in the +4 oxidation state.

presentation

Californium (IV) fluoride can be prepared from californium (III) oxide Cf ₂ O ₃ by reaction with elemental fluorine at 400 ° C:

${\displaystyle {\ce {2\ Cf_{2}O_{3}\ +\ 6\ F_{2}\ {\xrightarrow {400\ ^{\circ }C}}\ 4\ CfF_{3}\ +\ 3\ O_{2}}}}$

Alternatively, the fluoride is also formed by the β-decomposition of berkelium (IV) fluoride ( ²⁴⁹ BkF ₄ ).

properties

Californium (IV) fluoride is a light green ion compound consisting of Cf ⁴⁺ and F ^- ions. It crystallizes in the monoclinic crystal system in the space group  C 2 / c (No. 15) and twelve formula units per unit cell . Its crystal structure is isotype with uranium (IV) fluoride .

Californium (IV) fluoride releases elemental fluorine when heated and forms californium (III) fluoride :

${\displaystyle {\ce {2 CfF4 ->[\Delta T] 2 CfF3 + F2}}}$

safety instructions

Classifications according to the CLP regulation are not available because they only include chemical hazard and play a completely subordinate role compared to the hazards based on radioactivity . The latter also only applies if the amount of substance involved is relevant.

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 ).

Individual evidence

1. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1969.
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.
3. ^ ^{A b} J. E. Macintyre, FM Daniel, VM Stirling: Dictionary of inorganic compounds , Chapman and Hall, CRC Press, 1992, ISBN 978-0-412-30120-9 , p. 2826.
4. ^ LB Asprey, RG Haire: On the Actinide Tetrafluoride Lattice Parameters , in: Inorg. Nucl. Chem. Lett. , 1973 , 9  (11), pp. 1121-1128 ( doi: 10.1016 / 0020-1650 (73) 80017-0 ).
5. ^ RA Penneman, RR Ryan, A. Rosenzweig: Structural systematics in actinide fluoride complexes , in: Structure & Bonding , 1973 , 13 , pp. 1-52. doi: 10.1007 / 3-540-06125-8_1 .
6. ↑ HO Haug, RD Baybarz: Lattice parameter of the actinides tetra fluoride UF ₄ , BkF ₄ , and CfF ₄ , in: Inorg. Nucl. Chem. Lett. , 1975 , 11  (12), pp. 847-855 ( doi: 10.1016 / 0020-1650 (75) 80112-7 ).
7. ↑ CT. P. Chang, RG Haire, SE Nave: Magnetic Susceptibility of Californium Fluorides , in: Physical Review B , 1990 , 41  (13), pp. 9045-9048 ( doi: 10.1103 / PhysRevB.41.9045 ).