The vibrational spectrum of a strong O–H ⋯ F hydrogen bond: infrared and Raman spectra of the potassium fluoride–succinic acid adduct

Abstract

The crystalline potassium fluoride–succinic acid adduct contains strong hydrogen bonds, O–H ⋯ F^–. The i.r. spectra of KF·(CH₂CO₂H)₂ and KF·(CH₂CO₂D)₂ in the range 3 500–250 cm^–1, and the Raman spectrum of the protonated adduct between 3 000 and 20 cm^–1 are analysed in terms of the site symmetry in the crystal and are discussed according to current theories of the strong hydrogen bond.