Qualitative Analysis of Two Phenolic isomers of Carvacrol and Thymol by using Briggs-Rauscher Oscillator System

A new technique for identification of two phenolic isomers between carvacrol and thymol was discussed by using their different perturbation effect on Briggs-Rauscher oscillation system. In such system, a macrocyclic complex of [NiL](ClO4)(2) was used as catalyst, which ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. Experimental results proved that the perturbation of equal amount of same concentration two isomers separately into B-R system could temporarily quench the oscillation for period of time prior and regeneration of oscillation. The inhibition is directly proportional to the concentration of isomers. The carvocrol causes inhibition time, while no effect of thymol on the active B-R oscillation is measured. We identified the two phenolic isomers in the range from 1.25 x 10(-6) to 3.23 x 10(-5) mol/L, and correlation coefficient is 0.98755. The FCA mechanism based on HOO center dot radical has been proposed.