The molecular interaction of ethyl bromide with oleic acid (naturally occurring fatty acid) has been studied using standard dielectric methods. The permittivity at static and optical frequency (the sodium D-line) of a mixture of ethylbromide + Oleic acid was measured at three different temperatures. Kirkwood correlation parameters, the excess permittivity, the Bruggeman parameter and excess free-energy were determined for each concentration of the mixture. A negative value of excess permittivity was obtained for a mixture of ethylbromide and Oleic acid at all studied temperatures. Parallel and anti-parallel alignments of dipoles in the mixture were identified.

Keywords: Permittivity; Oleic Acid; Kirkwood correlation factor, H-Bonding