Spectrophotometric determination of association equilibrium constants of certain phenol substitution derivatives with triethylamine

A spectrophotometric technique was used to determine the association equilibrium constants of phenol, o-isopropylphenol, p-tert-butylphenol, 3,4-, 2,5-, 2, 6-dimethylphenols, and thymol with triethylamine (in an n-heptane medium). The ultraviolet spectra recorded serve as proof of the formation of a hydrogen bond between the hydrogen atoms of the hydroxyl group and the nitrogen atom of triethylamine in these systems (phenol-triethylamine-n-heptane).