Tetrafluoroborates

Tetrafluoroborate ion

Tetrafluoroborates are chemical compounds that contain the anion BF ₄ ^- . They represent the salts of tetrafluoroboric acid HBF ₄ . The boron is in the +3 oxidation state.

Extraction and presentation

The tetrafluoroborates can result from the reaction with a base .

${\displaystyle {\ce {NaOH + HBF4 -> NaBF4 + H2O}}}$

Sodium hydroxide and tetrafluoroboric acid react to form sodium tetrafluoroborate and water .

${\displaystyle {\ce {CuO + HBF4 -> Cu[BF4]2 + H2O}}}$

Copper (II) oxide and tetrafluoroboric acid react to form copper (II) tetrafluoroborate and water .

properties

The tetrafluoroborates are mostly odorless, white powders. They are readily soluble in water, with the exception of potassium tetrafluoroborate . Many tetrafluoroborate salts are corrosive and in some cases harmful to health or the environment.

use

The salts have various uses. Silver tetrafluoroborate is used as a catalyst for nitration, acylation and sulfonation. Copper (II) tetrafluoroborate is used for the production of copper complexes .

Individual evidence

1. ↑ Herbert W. Roesky: Efficient Preparations of Fluorine Compounds . John Wiley & Sons, 2012, ISBN 1-118-40942-6 , pp. 43 ( limited preview in Google Book search).