Promethium (III) chloride
Crystal structure | ||||||||||||||||
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__ Pm 3+ __ Cl - | ||||||||||||||||
Crystal system | ||||||||||||||||
Space group |
P 6 3 / m (No. 176) |
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Lattice parameters |
a = 739 pm |
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Coordination numbers |
Pm [9], Cl [3] |
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General | ||||||||||||||||
Surname | Promethium (III) chloride | |||||||||||||||
other names |
Promethium trichloride |
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Ratio formula | PmCl 3 | |||||||||||||||
Brief description |
purple solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 253.27 g mol −1 ( 147 μm) | |||||||||||||||
Physical state |
firmly |
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density |
4.19 g cm −3 |
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Melting point |
655 ° C |
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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 . |
Promethium (III) chloride is a chemical compound made up of the elements promethium and chlorine . It has the formula PmCl 3 and belongs to the chloride class .
presentation
Promethium (III) chloride is formed from promethium (III) oxide (Pm 2 O 3 ) by heating in a dry stream of HCl at 580 ° C.
properties
Promethium (III) chloride (PmCl 3 ) is a purple solid with a melting point of 655 ° C. It crystallizes in the hexagonal crystal system ( NdCl 3 type ) with the lattice parameters a = 739 pm and c = 421 pm with two formula units per unit cell and thus a calculated density of 4.19 g · cm −3 .
If PmCl 3 is heated in the presence of H 2 O, the pale pink colored promethium (III) oxychloride (PmOCl) is obtained.
safety instructions
Classifications according to the CLP regulation are not available because these 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
- Fritz Weigel: The chemistry of promethium , in: Fortschr. Chem. Forsch. , 1969 , 12 (4), pp. 539-621 ( doi : 10.1007 / BFb0051097 ).
- James E. Huheey: Inorganische Chemie , 1st edition, de Gruyter, Berlin 1988, ISBN 3-11-008163-6 , pp. 873-900.
Individual evidence
- ↑ a b c d e Weigel: Die Chemie des Promethiums , pp. 588-589.
- ^ A b c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1942.
- ↑ a b Gmelin's Handbook of Inorganic Chemistry , System No. 39, Part C 4 b, p. 181.
- ↑ 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.
- ↑ Gmelin's Handbook of Inorganic Chemistry , System No. 39, Part C 6, pp. 61–62.
- ↑ Gmelin's Handbook of Inorganic Chemistry , System No. 39, Part C 5, p. 31.