Neptunium (V) fluoride

Crystal structure
	__ Np 5+ __ F -
Crystal system	tetragonal
Space group	I 4 / m (No. 87)
Lattice parameters	a = 653.58 (18) pm ; c = 445.62 (14) pm
General
Surname	Neptunium (V) fluoride
other names	Neptunium pentafluoride
Ratio formula	NpF 5
Brief description	light blue solid
External identifiers / databases
Wikidata	Q1977884
properties
Molar mass	332.04 g mol −1
Physical state	firmly
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 (V) fluoride is a chemical compound made up of the elements neptunium and fluorine . It has the formula NpF ₅ and belongs to the fluoride class of substances .

presentation

Neptunium (V) fluoride was prepared by reacting a solution of NpF ₆^- with the Lewis acid boron trifluoride (BF ₃ ) in anhydrous hydrogen fluoride (HF). The purity of the NpF ₅ was determined by its Mössbauer spectrum , which only showed the presence of Np ^V.

properties

Neptunium (V) fluoride is a light blue solid. It crystallizes in the tetragonal crystal system with the lattice parameters a = 653.58 (18) pm and c = 445.62 (14) pm. NpF ₅ has the same structure as α-UF ₅ . Photochemical irradiation of neptunium hexafluoride (NpF ₆ ) results in an amorphous material which is believed to be NpF ₅ .

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 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.
↑ 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.
↑ ^a ^b ^c J. G. Malm, CW Williams, L. Soderholm, LR Morss: Preparation, Chemical Reactions, and some Physical Properties of Neptunium Pentafluoride , in: Journal of Alloys and Compounds , 1993 , 194 (1), pp. 133-137 ( doi : 10.1016 / 0925-8388 (93) 90658-A ).
↑ Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, p. 107.

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 ).
Linfeng Rao, Guoxin Tian, Yuanxian Xia, Judah I. Friese: Thermodynamics of Neptunium (V) Fluoride and Sulfate at Elevated Temperatures , LBNL-59805 ( PDF ).

[HOWI_1969-1] 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.

[NV-2] 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.

[NPF5-3] J. G. Malm, CW Williams, L. Soderholm, LR Morss: Preparation, Chemical Reactions, and some Physical Properties of Neptunium Pentafluoride , in: Journal of Alloys and Compounds , 1993 , 194 (1), pp. 133-137 ( doi : 10.1016 / 0925-8388 (93) 90658-A ).

[Gmelin-4] Gmelin's Handbook of Inorganic Chemistry , System No. 71, Transurane, Part C, p. 107.