The Research And Application Of Briggs-rauscher Chemical Oscillating System

In some autocatalysis reactions, the concentration and colour change periodically in nonequilibrium environment. The phenomenon is widespread in some areas such as chemistry, physics, biology, therefore the chemical oscillating is regarded as a hot topic. The chemical oscillating system gives some important theory and makes contributions solving some problems about the mineral exploration, atmospheric dynamics and chemical analysis. At present the chemical oscillating system made a great progress in pharmaceutical analysis, bioscience and other fields. The exploration about chemical oscillation system mainly focuses on finding new organic substrates or new catalyze, the mechanism, the application and computer simulation. In this paper, we discuss a new BR oscillating system catalyzed by a new macrocyclic nickel complexes - NiL (CIO4)2 and the organic substrate is the malonic acid. The ligand L in the complex is 5,7, 7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. In the paper the new application of the BR chemical system is discussed which can distinguish cyclohexane-1,3-dione from 1,4-cyclohexanedione. The intermediate products when cyclohexane-1,3-dione from 1,4-cyclohexanedione injected into the system were explored. A new method to detect hesperetin and caffeic acid is proposed also. The paper was separated into four parts:1、The history about the oscillating systemIn the first part we introduce some history about chemical oscillating system and the common type of chemical oscillating system was mentioned also. Characteristics and advantages of the new oscillating system compared to the common oscillating system are mentioned. The importance is the application about the oscillating system in the some areas.2、To distinguish the cyclohexane-1,3-dione from 1,4-cyclohexanedione by the new BR oscillating system.Firstly the catalyst tetraaza-macrocyclic metal complexes- [NiL] (CIO4)2 was synthesized according to the literature. Then the system KIO3-NiL-MA-H2SO4-H2O2 was set up. It is known that the isomeride is hard to separate. The chapter introduce a new method by using the new BR system to distinguish the cyclohexane-l,3-dione from 1,4-cyclohexanedione. Some ions which disturb the chemical oscillating system also explored in experiment. And the method has its advantages such as the high sensitivity and lower limit.3、To detect the hesperetin by the new BR oscillating systemWhen the hesperetin was injected into the new BR oscillating system, some disturbance can be observed. We define the inhibition time as a parameter to discuss the influence. As a result, when the concentration of hesperetin is during 1.5×10-6 to 1.58×10-4M there is a linear relationship between the concentration and the inhibition time. In order to find the optimum condition to test the hesperetin the control variable method was used. And through the method of cyclic voltammetry, we can explore the mechanism about the system.4、To detect the caffeic acid by the new BR oscillating systemWhen the caffeic acid was injected into the new BR oscillating system, there exists perturbation in the system. We define the inhibition time as a parameter to discuss the influence. As a result, when the concentration of caffeic acid is during 1.5 ×10-6～2.0×10-5M there is a linear relationship between the concentration of caffeic acid and the inhibition time. In order to find the optimum condition to test the the control variable method was used. And through the method of cyclic voltammetry, we can explore the mechanism about the system.