Dipole moments and spectral features of some phenol–diethylamine complexes

Abstract

The dipole moments of molecular complexes of two types, AB and A₂B₂, formed between phenol derivatives with diethylamine in benzene solution have been determined. The polarity of the hydrogen bond, Δµ, in AB complexes depends on the pK_a of the phenol and confirms the generality of the Δµ against pK_a sigmoid curve. A₂B₂ complexes change their structure from chain to cyclic when the proton-donor properties of the phenol increase.