Equilibria Between Molecular and Ionic Complexes with an NH…N Hydrogen Bond.Fluorinated Aromatic Amine as a Proton Donor

摘要

Ultraviolet absorption spectra in the range 300-200 K were used to study the composition and structure of complexes formed in solutions by the fluorinated amine (4-CF_3C_6F_4)_2NH as a proton donor with dibutylamine. A program is developed for quantitative analysis of sets of the spectra of equilibrium multicomponent systems, that allow to find spectral and thermodynamic characteristics of the individual components. In the systems in study, 1:1 and 1:2 fluorinated diamine-dibutylamine complexes are formed. The first of them in a molecular complex with an NH…N hydrogen bond, and the second is an ionic proton-transfer complex. The equilibrium constants between the complexes and the free molecules are found, the enthalpies and entropies of formation of both complexes are found, and the spectra of the complexes are measured.