Promethium (III) chloride

Crystal structure
	__ Pm 3+ __ Cl -
Crystal system	hexagonal
Space group	P 6 3 / m (No. 176)
Lattice parameters	a = 739 pm ; c = 421 pm
Coordination numbers	Pm [9], Cl [3]
General
Surname	Promethium (III) chloride
other names	Promethium trichloride
Ratio formula	PmCl 3
Brief description	purple solid
External identifiers / databases
EC number	237-420-0
ECHA InfoCard	100.034.004
PubChem	3014783
Wikidata	Q1652677
properties
Molar mass	253.27 g mol −1 ( 147 μm)
Physical state	firmly
density	4.19 g cm −3
Melting point	655 ° C
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
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 .

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.

[Weigel_588_589-1] Weigel: Die Chemie des Promethiums , pp. 588-589.

[HOWI_1942-2] 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.

[Gmelin_C4b_181-3] Gmelin's Handbook of Inorganic Chemistry , System No. 39, Part C 4 b, p. 181.

[NV-4] 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.

[5] Gmelin's Handbook of Inorganic Chemistry , System No. 39, Part C 6, pp. 61–62.

[Gmelin_C5_31-6] Gmelin's Handbook of Inorganic Chemistry , System No. 39, Part C 5, p. 31.