Actinium (III) fluoride

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Crystal structure
Crystal structure of actinium (III) fluoride
__  Ac 3+      __  F -
Crystal system

hexagonal

Space group

P 3 c 1 (No. 165)Template: room group / 165

Lattice parameters

a = 741 pm
c = 755 pm

Coordination numbers

Ac [9], F [3]

General
Surname Actinium (III) fluoride
other names
  • Actinium fluoride
  • Actinium trifluoride
Ratio formula AcF 3
Brief description

white solid

External identifiers / databases
CAS number 33689-80-4
Wikidata Q3074510
properties
Molar mass 284.02 g mol −1
Physical state

firmly

density

7.88 g cm −3

Hazard and safety information
Radioactive
Radioactive
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 .

Actinium (III) fluoride is a chemical compound of the elements actinium and fluorine .

presentation

Actinium (III) fluoride can be prepared either in solution or by solid reaction. In the first case, hydrofluoric acid is added to an Ac 3 solution at room temperature and the product is precipitated.

In the other case, actinium metal is treated with hydrogen fluoride at 700 ° C in a platinum apparatus.

properties

Physical Properties

Actinium (III) fluoride is a white solid. It crystallizes trigonally in the space group P 3 c 1 (space group no. 165) with the lattice parameters a  = 741  pm and c  = 755 pm and six formula units per unit cell . Template: room group / 165

Chemical properties

The conversion of actinium (III) fluoride with moist ammonia at 900–1000 ° C yields the oxyfluoride AcOF.

While lanthanum oxyfluoride is easily formed by heating lanthanum (III) fluoride in air at 800 ° C in about an hour, a similar treatment of actinium (III) fluoride does not yield AcOF and only results in a melt of the original substance.

safety instructions

Classifications according to the GHS regulation are not available because they only include chemical hazard, which plays 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

  1. ^ A b W. H. Zachariasen: Crystal Chemical Studies of the 5 f Series of Elements. XII. New Compounds Representing Known Structure Types. In: Acta Crystallographica . 2, 1949, pp. 388-390, doi : 10.1107 / S0365110X49001016 .
  2. Gerd Meyer, Lester R. Morss: Synthesis of lanthanide and actinide compounds. Springer, 1991, ISBN 0-7923-1018-7 , p. 71 ( limited preview in Google book search).
  3. ^ A b c Sherman Fried, French Hagemann, WH Zachariasen: The Preparation and Identification of Some Pure Actinium Compounds. In: J. Am. Chem. Soc. 72, 1950, pp. 771-775, doi : 10.1021 / ja01158a034 .
  4. ^ A b c Gerd Meyer, Lester R. Morss: Synthesis of lanthanide and actinide compounds. Springer, 1991, ISBN 0-7923-1018-7 , pp. 87-88 ( limited preview in Google book search).
  5. 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.