Neptunium (IV) bromide

General
Surname	Neptunium (IV) bromide
other names	Neptunium tetrabromide
Molecular formula	NpBr 4
Brief description	dark red solid
External identifiers / databases
Wikidata	Q1977879
properties
Molar mass	556.66 g mol −1
Physical state	firmly
Melting point	464 ° C
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
Thermodynamic properties
ΔH f 0	−184.5 ± 0.5 kcal mol −1
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Neptunium (IV) bromide is a chemical compound made up of the elements neptunium and bromine . It has the formula NPBR ₄ and belongs to the class of the bromides .

presentation

The representation is achieved by reacting neptunium (IV) oxide (NpO ₂ ) with aluminum bromide (AlBr ₃ ), but better by heating the metal or neptunium (III) bromide (NpBr ₃ ) with excess bromine at 425 ° C.

{\ displaystyle {\ ce {2 NpBr3 + Br2 -> 2 NpBr4}}}

properties

Neptunium (IV) bromide is a dark red solid that melts at 464 ° C. It crystallizes in the monoclinic crystal system with the lattice parameters a = 1089 pm , b = 874 pm, c = 705 pm and β = 94.19 °.

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 Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, pp. 150–151.
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1969.
↑ 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.
↑ C. Keller: Die Chemie des Neptunium , in: Fortschr. chem. Forsch. , 1969/70 , 13/1 , p. 69.

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 ).

[Gmelin-1] Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, pp. 150–151.

[HOWI_1969-2] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1969.

[NV-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.

[Keller-4] C. Keller: Die Chemie des Neptunium , in: Fortschr. chem. Forsch. , 1969/70 , 13/1 , p. 69.