| In this paper,we studied the Briggs Rauscher chemical oscillation system composed of H2SO4-Malonic acid(MA)-KIO3-[Nil](Cl O4)2-H2O2,and distinguished the optically active isomers,inorganic anions and isomers by using the disturbance of the system to be measured.This method is simple,fast,easy to operate,and low cost,so it has good application value and prospect.The introduction part of this paper introduces the content of nonlinear science,as well as the branch of nonlinear science,that is nonlinear dynamics,including the occurrence conditions,history and research topics of nonlinear chemical dynamics.Chemical oscillations,chemical waves,chemical chaos,Turing and speckle patterns are introduced in the research topics of nonlinear chemical dynamics,with emphasis on chemical oscillations.At the same time,the reaction mechanism,development background and prospect of BR oscillation system in chemical oscillation are described in detail.In chapter 2,the Briggs Rauscher nonlinear chemical oscillation system was established with a novel macrocyclic nickel complex[Ni L](Cl O4)2(where L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene)as catalyst to quantitatively distinguish the optically active isomers.The catalyst[Ni L](Cl O4)2was synthesized in the laboratory and its structure was characterized by infrared analysis and elemental analysis.First,a Briggs-Rauscher system has been established.When two kinds of optical isomers(R-binaphthol,S-binaphthol)solution with same concentration were added respectively in the oscillation system,different perturbation responses appear.According to the different influences(of the R-Naphthol and S-Naphthol)on the oscillation pattern,these two isomers were distinguished from each other.In concentration range of 1.25×10-6-6.25×10-6mol/L,there is a good linear relationship between the concentration of the analytes and the disturbance(inhibition time).The possible oxidation products of the two isomers in the system were characterized by cyclic voltammetry(CV),infrared spectroscopy(IR)and other characterization techniques,and a reasonable explanation of the perturbation behavior was given based on FCA and NF models.In the third chapter,the Briggs-Rauscher chemical oscillator is used to distinguish the halogen anions.The quantitative analysis and qualitative detection of four halogen anions by electrochemical method were realized for the first time using a Briggs-Rauscher oscillator.At the same time,in the 5.0×10-5mol/L-2.375×10-4mol/L concentration range,solutions of halogen anions containing the same amount of F-,Cl-,Br-,I-were added respectively in the oscillating system.It can be observed that the impact of each analyte on the system are different,so distinguishing four kinds of halogen ions can be realized on the basis of their different perturbation effects.At the same time,the relationship between the inhibition time(tin)and the concentration of the ions is linear.Finally,according to the cyclic voltammetry test,mass spectrometry analysis and other test means,the possible oxidation products were confirmed and reasonable explanation on perturbation mechanism of the four halogen anions(F-,Cl-,Br-,I-)are given.In chapter 4,using the macrocyclic complex[Ni L](Cl O4)2as catalyst,the differentiation of galangin and its isomer baicalein was studied by using the B-R chemical oscillation system(MA-H2SO4-H2O2-KIO3-[Ni L](Cl O4)2).Specifically,analyte samples with the same concentration(galangin and baicalein solutions)were added into the two oscillating systems respectively,and the qualitative analysis of the differentiated samples was realized according to the different effects of the samples on the oscillating behavior.Through cyclic voltammetry test and based on FCA and NF model,a reasonable explanation was given for the disturbance behavior.It was speculated that the analyte(galangin and baicalein)might react with the intermediate HOO·to form final products. |
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