摘要
报道了一种利用四氮杂大环配合物催化Briggs-Rauscher(BR)振荡反应测定2,6-二叔丁基-4-甲基苯酚(BHT)的方法,所涉及的体系为H_2SO_4-KIO_3-[NiL](ClO_4)_2-MA-H_2O_2(其中L为四氮杂大环5,7,7,12,14,14-六甲基-1,4,8,11-四氮环杂十四-4,11-二烯,MA表示丙二酸)。通过研究发现,在该体系中加入一定浓度的BHT,会使得振荡体系的周期、振幅等都发生改变,同时体系会产生抑制时间。当BHT浓度在1.95×10^(-7)~6.25×10^(-6)mol/L范围内,抑制时间与加入的BHT浓度呈很好的二次函数关系;当BHT浓度在6.25×10^(-6)~1.56×10^(-5)mol/L范围内,抑制时间与加入的BHT浓度呈很好的一次线性关系。为了达到更好的定量检测效果,对各组分的浓度进行了优化,使得检测效果达到最佳,最后对反应机理进行了探讨。
A new method for the determination of 2,6-di-tert-butyl-4-methylphenol（ BHT） was reported. The method relies on the perturbation effect which is caused by different amounts of BHT on the macrocyclic Ni（ Ⅱ） complex-catalyzed Briggs-Rauscher（ BR） oscillating reaction. The macrocyclic Ni（ Ⅱ） complex is [NiL]（ClO4）2,where L is 5,7,7,12,14,14-hexemethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. Perturbation of the BHT on the BR system resulted in changes in the oscillation amplitude and period of oscillation,being accompanied by an inhibition time. This method relies on the relationship between inhibition time（ tin） and the concentration of BHT. The calibration curve fits a second-order polynomial equation very well when the concentration of BHT is over the range of 1. 95 ×10^-7～ 6. 25 ×10^-6mol/L. When the concentration of BHT is over the range of 6. 25 ×10^-6～ 1. 56 × 10^-5 mol/L,the calibration curve obeys linear equation. The effects of the concentration of components were elucidated. Some aspects of the BHT perturbation mechanism were discussed in detail.
出处
《化学试剂》
北大核心
2017年第5期521-524,557,共5页
Chemical Reagents
基金
国家自然科学基金资助项目(21171002)
