Ammonium tetrafluoroberyllate

Crystal structure
__ N 3−       __ H +       __ Be 2+       __ F -
General
Surname	Ammonium tetrafluoroberyllate
other names	Ammonium tetrafluoridoberyllate Ammonium fluoroberyllate Diammonium tetrafluoroberyllate Beryllium diammonium tetrafluoride
Ratio formula	(NH 4 ) 2 [BeF 4 ]
Brief description	white solid
External identifiers / databases
CAS number 14874-86-3 EC number 238-948-4 ECHA InfoCard 100.035.393 Wikidata Q4456665
properties
Molar mass	121.08 g mol −1
Physical state	firmly
safety instructions
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 .

Ammonium fluoroberyllate , correct according to IUPAC Ammonium tetrafluoridoberyllate is a chemical compound of beryllium from the group of fluorobberyllates .

Extraction and presentation

Ammonium fluoroberyllate can be obtained by reacting ammonium fluoride with beryllium hydroxide.

${\displaystyle \mathrm {4\ NH_{4}F+Be(OH)_{2}\longrightarrow (NH_{4})_{2}[BeF_{4}]+2\ NH_{4}OH} }$

properties

Ammonium fluoroberyllate is a colorless solid that crackles when heated, then melts and develops fumes of ammonium fluoride. It crystallizes orthorhombically in the space group Pnma (space group no. 62) . The crystal structure consists of tetrahedral ammonium ions and also tetrahedral anions [BeF ₄ ] ²⁻ .

Individual evidence

1. ↑ ^{a b c} Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 243.
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ A. Garg, S. Srivastava: Ammonium Tetrafluoroberyllate (II) . In: Acta Crystallographica , 1979 , B35 , pp. 1429-1432 ( doi : 10.1107 / S0567740879006609 ).