Neptunium (III) chloride

Crystal structure
	__ Np 3+ __ Cl -
Crystal system	hexagonal
Space group	P 6 3 / m (No. 176)
Lattice parameters	a = 740.5 pm ; c = 427.3 pm
Coordination numbers	Np [9], Cl [3]
General
Surname	Neptunium (III) chloride
other names	Neptunium trichloride
Ratio formula	NpCl 3
Brief description	green solid
External identifiers / databases
Wikidata	Q1977871
properties
Molar mass	343.41 g mol −1
Physical state	firmly
density	5.58 g cm −3
Melting point	800 ° 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 .

Neptunium (III) chloride is a chemical compound made up of the elements neptunium and chlorine . It has the formula NpCl ₃ and belongs to the chloride class .

presentation

Neptunium (III) chloride can be produced by reducing neptunium (IV) chloride (NpCl ₄ ): with hydrogen at 450 ° C and with ammonia gas at 350 to 1000 ° C.

{\ displaystyle {\ ce {2 NpCl4 + H2 -> 2 NpCl3 + 2 HCl}}}

properties

Neptunium (III) chloride is a green solid that melts at 800 ° C. It crystallizes in the hexagonal crystal system in the space group P 6 ₃ / m (No. 176) with the lattice parameters a = 740.5 pm and c = 427.3 pm and two formula units per unit cell . Its crystal structure is isotype with uranium (III) chloride . In the structure, the neptunium atoms are each surrounded by nine chlorine atoms, resulting in a three-way, trigonal prism as a coordination polyhedron . Template: room group / 176

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

↑ ^a ^b ^c C. Keller: The chemistry of Neptunium , in: Fortschr. chem. Forsch. , 1969/70 , 13/1 , p. 69.
^ ^A ^b 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. 1969.
↑ ^a ^b Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, pp. 129–135.
↑ 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.

literature

Zenko Yoshida, Stephen G. Johnson, Takaumi Kimura, John R. Krsul: Neptunium , 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. 699-812 ( doi : 10.1007 / 1-4020-3598-5_6 ).
C. Keller: The chemistry of neptunium , in: Fortschr. chem. Forsch. , 1969/70 , 13/1 , pp. 1–124 ( doi: 10.1007 / BFb0051170 ).

[Keller-1] C. Keller: The chemistry of Neptunium , in: Fortschr. chem. Forsch. , 1969/70 , 13/1 , p. 69.

[HOWI_1969-2] A ^b 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. 1969.

[Gmelin-3] Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, pp. 129–135.

[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.