Berkelium (III) chloride

Crystal structure
	__ Bk 3+ __ Cl -
Crystal system	hexagonal
Space group	P 6 3 / m (No. 176)
Lattice parameters	a = 738.2 pm; c = 412.7 pm
Coordination numbers	Bk [9], Cl [3]
General
Surname	Berkelium (III) chloride
other names	Berkelium trichloride
Ratio formula	BkCl 3
Brief description	green hexagonal crystals
External identifiers / databases
Wikidata	Q820865
properties
Molar mass	353.43 g mol −1
Physical state	firmly
Melting point	603 ° 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 .

Berkelium (III) chloride is a chloride of the artificial element and actinoid Berkelium with the empirical formula BkCl ₃ . In this salt , Berkelium occurs in the +3 oxidation state.

properties

Berkelium (III) chloride is a green solid and crystallizes in the hexagonal crystal system in the space group P 6 ₃ / m (No. 176) with the lattice parameters a = 738.2 ± 0.2 pm and c = 412.7 ± 0, 3 pm and two formula units per unit cell . Its crystal structure is isotype with uranium (III) chloride (UCl ₃ ). In the structure, the Berkelium atoms are each surrounded by nine chlorine atoms, resulting in a triple-capped, trigonal prism as a coordination polyhedron . Template: room group / 176

The hexahydrate (BkCl ₃ · 6 H ₂ O) has a monoclinic crystal structure with: a = 966 pm, b = 654 pm and c = 797 pm and β = 93 ° 46 '; Room group: P 2 / n (No. 13, position 2) . Template: room group / 13.2

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 Berkelium (III) chloride at www.webelements.com.
↑ 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.
↑ Joseph Richard Peterson: The Solution Absorption Spectrum of Bk ³⁺ and the Crystallography of Berkelium Dioxide, Sesquioxide, Trichloride, Oxychloride, and Trifluoride , Ph.D. Thesis, October 1967, US Atomic Energy Commission Document Number UCRL-17875 (1967).
↑ JR Peterson, BB Cunningham: Crystal Structures and Lattice Parameters of the Compounds of Berkelium II. Berkelium Trichloride , in: J. Inorg. Nucl. Chem. , 1968 , 30 (3), pp. 823-828 ( doi: 10.1016 / 0022-1902 (68) 80443-9 ).
↑ JR Peterson, JP Young, DD Ensor, RG Haire: Absorption Spectrophotometric and X-Ray Diffraction Studies of the Trichlorides of Berkelium-249 and Californium-249 , in: Inorg. Chem. , 1986 , 25 (21), pp. 3779-3782 ( doi: 10.1021 / ic00241a015 ).
↑ John H. Burns, Joseph Richard Peterson: The Crystal Structures of Americium Trichloride Hexahydrate and Berkelium Trichloride Hexahydrate , in: Inorg. Chem. , 1971 , 10 (1), pp. 147-151 ( doi: 10.1021 / ic50095a029 ).

literature

David E. Hobart, Joseph R. Peterson: Berkelium , 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. 1444-1498 ( doi : 10.1007 / 1-4020-3598-5_10 ).

[webelements-1] Berkelium (III) chloride at www.webelements.com.

[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.

[PETERSON_THESIS-3] Joseph Richard Peterson: The Solution Absorption Spectrum of Bk ³⁺ and the Crystallography of Berkelium Dioxide, Sesquioxide, Trichloride, Oxychloride, and Trifluoride , Ph.D. Thesis, October 1967, US Atomic Energy Commission Document Number UCRL-17875 (1967).

[4] JR Peterson, BB Cunningham: Crystal Structures and Lattice Parameters of the Compounds of Berkelium II. Berkelium Trichloride , in: J. Inorg. Nucl. Chem. , 1968 , 30 (3), pp. 823-828 ( doi: 10.1016 / 0022-1902 (68) 80443-9 ).

[5] JR Peterson, JP Young, DD Ensor, RG Haire: Absorption Spectrophotometric and X-Ray Diffraction Studies of the Trichlorides of Berkelium-249 and Californium-249 , in: Inorg. Chem. , 1986 , 25 (21), pp. 3779-3782 ( doi: 10.1021 / ic00241a015 ).

[6] John H. Burns, Joseph Richard Peterson: The Crystal Structures of Americium Trichloride Hexahydrate and Berkelium Trichloride Hexahydrate , in: Inorg. Chem. , 1971 , 10 (1), pp. 147-151 ( doi: 10.1021 / ic50095a029 ).