Curium (III) iodide

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Crystal structure
Crystal structure of curium (III) iodide
__ cm 3+      __ I -
Crystal system

hexagonal

Space group

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

Lattice parameters

a = 744 pm
c = 2040 pm

General
Surname Curium (III) iodide
other names

Curium triiodide

Ratio formula CmI 3
Brief description

colorless solid

External identifiers / databases
CAS number 14696-85-6
Wikidata Q1144608
properties
Molar mass depending on the isotope: 619–631 g · mol −1
Physical state

firmly

density

6.37 g cm −3

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 .

Curium (III) iodide is an iodide of the artificial element and actinide curium with the empirical formula CmI 3 . In this salt , curium occurs in the +3 oxidation state. Since all isotopes of curium are only artificially produced, it has no natural occurrence.

presentation

Can contribute to the synthesis of curium (III) iodide , elemental Curium and iodine to the reaction are brought.

A second synthetic route is given by the reaction of curium (III) chloride with ammonium iodide .

properties

Curium (III) iodide is a colorless ionic compound consisting of Cm 3+ and I - ions. It crystallizes in the hexagonal crystal system in the space group R 3 (space group no. 148) with the lattice parameters a  = 744  pm and c  = 2040 pm and six formula units per unit cell . Its crystal structure is isotype with bismuth (III) iodide . Template: room group / 148

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.

Individual evidence

  1. ↑ Gregg J. Lumetta, Major C. Thompson, Robert A. Penneman, P. Gary Eller: Curium , in: Lester R. Morss, Norman M. Edelstein, Jean Fuger (ed.): The Chemistry of the actinides and transactinide element element , Springer, Dordrecht 2006; ISBN 1-4020-3555-1 , pp. 1397-1443 ( doi : 10.1007 / 1-4020-3598-5_9 ).
  2. ^ Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, p. 154.
  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. ^ GT Seaborg, RA James, A. Ghiorso: The Transuranium Elements , in: Natl. Nucl. En. Ser. , 1949 , Div. IV, 14B, McGraw-Hill, New York, pp. 1554-1571.
  5. ↑ a b L. B. Asprey, TK Keenan, FH Kruse: Crystal Structures of the Trifluorides, Trichlorides, Tribromides, and Triiodides of Americium and Curium , in: Inorg. Chem. , 1965 , 4  (7), pp. 985-986 ( doi: 10.1021 / ic50029a013 ).

literature

  • Gregg J. Lumetta, Major C. Thompson, Robert A. Penneman, P. Gary Eller: Curium , 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. 1397-1443 ( doi : 10.1007 / 1-4020-3598-5_9 ).