Wang Yan
1992
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Journal
Spectroscopy and Spectral Analysis
Abstract
IR spectroscopy has been used to study the hydrogen-bonding behavior of ortho substituted benzoic acids. Carboxyl dimers, which exist in the solid state o-halogen benzoic acid and benzoic acid, dissociate partially in the melt form, but some dimers still exist. In the solid and liquid states, the o-ethoxybenzoic acid has intramolecular H-bonding structure, shown by the identity of the spectra in the two states. By comparing the similarity and difference of spectra of o-methoxy and o-ethoxy benzoic acids in the melt form and in CCl_4, we concluded that o-methoxybenzoic acid in the solid state exists as carboxyl dimers, the carboxyl dimers dissociate at melting and the hydrogen of carboxyl group forms H-bonding with oxygen atom of the methoxy group in the liquid state.