Curium (III) iodide
Crystal structure | |||||||
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__ cm 3+ __ I - | |||||||
Crystal system | |||||||
Space group |
R 3 (No. 148) |
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Lattice parameters |
a = 744 pm |
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General | |||||||
Surname | Curium (III) iodide | ||||||
other names |
Curium triiodide |
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Ratio formula | CmI 3 | ||||||
Brief description |
colorless solid |
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External identifiers / databases | |||||||
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properties | |||||||
Molar mass | depending on the isotope: 619–631 g · mol −1 | ||||||
Physical state |
firmly |
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density |
6.37 g cm −3 |
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Hazard and safety information | |||||||
![]() Radioactive |
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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 .
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
- ↑ 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 ).
- ^ Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, p. 154.
- ↑ 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.
- ^ 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.
- ↑ 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 ).