Cadmium tetrafluoroborate

Structural formula
2
General
Surname	Cadmium tetrafluoroborate
Molecular formula	Cd [BF 4 ] 2
Brief description	colorless salt
External identifiers / databases
CAS number 14486-19-2 EC number 238-490-5 ECHA InfoCard 100.034.975 PubChem 12886773 Wikidata Q5016547
properties
Molar mass	286.02 g mol −1
Physical state	firmly
density	1.6 g cm −3
solubility	very soluble in water and ethanol
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary Caution H and P phrases H: 332-312-302-410 P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Cadmium tetrafluoroborate is an inorganic chemical compound of boron from the group of tetrafluoroborates . It is commercially available as a 50% solution.

Extraction and presentation

Cadmium tetrafluoroborate can be obtained by reacting tetrafluoroboric acid with cadmium , cadmium carbonate or cadmium oxide .

${\displaystyle \mathrm {CdO+2\ H[BF_{4}]\rightarrow Cd[BF_{4}]_{2}+H_{2}O} }$

${\displaystyle \mathrm {CdCO_{3}+2\ H[BF_{4}]\rightarrow Cd[BF_{4}]_{2}+CO_{2}\uparrow } }$

properties

Cadmium tetrafluoroborate is a hygroscopic, colorless and odorless salt that is very soluble in water and ethanol. It crystallizes in the orthorhombic crystal system in the space group Pbca (space group no. 61) with the lattice parameters a = 9.1271, b = 8.746 and c = 13.225 Å and eight formula units in the unit cell . Cd [BF ₄ ] ₂ forms hydrates with 2, 3 or 6 water molecules. All hydrates are solid salts.

use

Cadmium tetrafluoroborate is used to make electroplating baths for high-strength steels, where normal cyanide baths lead to problems with hydrogen embrittlement .

Individual evidence

1. ↑ ^{a b c d} Entry on Cadmium fluoroborate at ChemicalBook , accessed on May 21, 2016.
2. ^ William M. Haynes: CRC Handbook of Chemistry and Physics, 95th Edition . CRC Press, 2014, ISBN 978-1-4822-0868-9 , pp. 54 ( limited preview in Google Book search).
3. ↑ Entry on cadmium compounds in the GESTIS substance database of the IFA , accessed on March 23, 2019 (JavaScript required)
4. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry cadmium compounds, with the exception of cadmium selenosulphide (xCdS.yCdSe) and reaction mass of cadmium sulphide and zinc sulphide (xCdS.yZnS) , Reaction mass of cadmium sulfide and mercury sulfide (xCdS yHgS) as well as the cadmium compounds, which are listed separately in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on March 23, 2019. Manufacturers or distributors can use the harmonized classification and expand labeling .
5. ↑ G. Tavčar, B. Žemva: XeF ₂ as a Ligand in a Coordination Compound with the BF ₄ ^- Anion . In: Inorganic Chemistry , 2005 , 44 , pp. 1525-1529, doi : 10.1021 / ic048684p .
6. ↑ MP Georgiev, M. Maneva: Thermal decomposition and kinetic data of Cd (BF ₄ ) ₂ 6H ₂ O. In: Journal of Thermal Analysis. 47, 1996, p. 1729, doi : 10.1007 / BF01980918 .