Californium (III) iodide

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Crystal structure
Crystal structure of californium (III) iodide
__ Cf 3+      __ I -
Crystal system

hexagonal

Space group

R 3 (No. 148)Template: room group / 148

Lattice parameters

a  = 758.7  pm
c  = 2081.4 pm

General
Surname Californium (III) iodide
other names

Californium triiodide

Ratio formula CfI 3
Brief description

red-orange solid

External identifiers / databases
CAS number 20758-81-0
Wikidata Q1026970
properties
Molar mass 631.79 g mol −1
Physical state

firmly

Sublimation point

~ 800 ° C

Hazard and safety information
Radioactive
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 (III) iodide is an iodide of the artificial element and actinoid californium with the empirical formula CfI 3 . It is a red-orange solid and could be produced in microgram quantities under high vacuum . It can be represented at 500 ° C from californium (III) hydroxide (Cf (OH) 3 ) and hydrogen iodide (HI):

The triiodide sublimes at ~ 800 ° C without melting. It crystallizes in the trigonal crystal system in the space group  R 3 (No. 148) with the lattice parameters a  = 758.7  pm and c  = 2081.4 pm with six formula units per unit cell . Its crystal structure is isotype with bismuth (III) iodide . The optical spectra of the CfI 3 show absorption peaks which correspond to a prediction which originate from an extrapolation of the corresponding peak positions of the CfCl 3 and the CfBr 3 . Template: room group / 148

Individual evidence

  1. ↑ a b 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.
  2. ↑ a b c 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.
  3. ↑ 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.
  4. ↑ a b c 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