Potassium fluoride

Potassium fluoride (KF) is an ionic compound made of potassium cations and fluoride anions. It is a white, water-soluble solid.

Ionic bonding: Chemical bonding driven by electrostatic attraction between oppositely charged ions. Potassium fluoride’s crystal lattice is held together by attraction between K⁺ and F⁻.
Fluoride chemistry: The chemistry of compounds containing fluorine in the −1 oxidation state. KF is a convenient inorganic source of fluoride for reactions.
Potassium: A soft, highly reactive alkali metal with atomic number 19. Potassium atoms form K⁺ ions by losing their single outer electron.
Potassium chloride: An ionic compound with formula KCl, composed of potassium cations and chloride anions. Replacing fluoride with the larger chloride ion changes lattice and solution properties.
Fluoride ion: The negatively charged ion F⁻, formed when a fluorine atom gains one electron. Fluoride is the anion that potassium fluoride releases when it dissolves.
Nucleophilic substitution: A reaction in which a nucleophile replaces a leaving group attached to an electrophilic atom. Fluoride from KF can replace leaving groups in suitable organic substrates.
Fluorine: A highly reactive halogen with atomic number 9 and the greatest electronegativity of any element. Fluorine forms F⁻ ions by gaining one electron.
Potassium bromide: An ionic compound with formula KBr, composed of potassium cations and bromide anions. Its bromide ions are larger and less strongly hydrated than fluoride ions.
Potassium ion: The positively charged ion K⁺, formed when a potassium atom loses one electron. Potassium is the cation paired with fluoride in the compound.
Deoxofluorination: The replacement of oxygen-containing functional groups with fluorine in organic molecules. Potassium fluoride can act as a fluoride source in some deoxofluorination reagents and procedures.

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Caesium fluorideCompared with: It is a less costly alkali-metal fluoride, though its solubility and reactivity differ.