Identification of two aromatic isomers between 3- and 4-hydroxy benzoic acid by their perturbation on the potential oscillations of a Belousov-Zhabotinsky system |
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Affiliation: | 1. Department of Chemistry, Anhui University, Hefei 230601, People’s Republic of China;2. Institute of Applied Chemistry, East China Jiaotong University, Nanchang 330013, People’s Republic of China |
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Abstract: | A novel method for identification of two aromatic isomers of mono hydroxy benzoic acid (HBA) was reported by using their different perturbation effects on the potential oscillations of a Belousov-Zhabotinsky (BZ) system. In such a system, a macrocyclic complex of Cu [CuL](ClO4)2 was used as catalyst in which ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. To the BZ system, 3-hydroxy benzoic acid (3-HBA) could temporarily quench and regenerate potential oscillations with damping characters after inhibition time (tin) while 4-hydroxy benzoic acid (4-HBA) could only change the oscillation amplitude (ΔA) to give damping oscillations with no inhibition time. Thus, these two isomers of HBA were identified. Reaction mechanisms of BZ have been proposed by FKN model. An explanation of perturbation mechanism is that, although 3-HBA reacted with BrO2 while 4-HBA reacted with BrO3−, they all produced 1,4-quinone. |
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Keywords: | Belousov-Zhabotinsky Perturbation Hydroxy benzoic acid Isomer Identification |
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