物理化学学报 >> 1994, Vol. 10 >> Issue (04): 312-318.doi: 10.3866/PKU.WHXB19940406

研究论文 上一篇    下一篇

铁(III)卟啉催化β-胡萝卜素分解动力学研究

阮文娟, 朱志昂, 黄小群, 陈荣悌, 江冬青   

  1. 南开大学化学系,南开大学中心实验室,天津 300071
  • 收稿日期:1992-08-03 修回日期:1993-01-15 发布日期:1994-04-15
  • 通讯作者: 朱志昂

Kinetic Study on Porphinatoiron(III) Catalyzing Decomposition of β-Carotene

Ruan Wen-Juan, Zhu Zhi-Ang, Huang Xiao-Qun, Chen Rong-Ti, Jiang Dong-Qing   

  1. Department of Chemistry, Nankai University, Tianjin 300071; Central Laboratory, Nankai University, Tianjin 300071
  • Received:1992-08-03 Revised:1993-01-15 Published:1994-04-15
  • Contact: Zhu Zhi-Ang

摘要:

使用BeckmannDU-8B紫外可见分光光度计研究了以氯合四-间三甲苯基卟啉铁(Ⅲ)(FeTMPCl)为催化剂,间氯过氧化苯甲酸(mCPBA)为氧化剂,咪唑(I_m)、2-甲基咪唑(MeI_m)、2-乙基-4-甲基咪唑(EMI_m)为轴向配体,催化β-胡萝卜素(β-cte)氧化分解为维生素A的动力学规律,提出了反应机理,研究了温度、催化剂浓度、氧化剂浓度及轴向配体对反应速率的影响,应用Gauss-Newton-Marquardt方法求得各基元反应的有关动力学参数.

关键词: 氯合四-间三甲苯基卟啉铁(III), 氧化分解, 反应机理, β-胡萝卜素

Abstract:

A spectrophotometric study of the kinetics of β-carotene oxidative decom-position to vitamin A is reported in this paper. Meso-tetramesityl-porphinatoiron (Ⅲ) chloride (FeTMPCl) was used as catalyst and m-chloroper-benzoic acid (mCPBA) as oxidant in dichloromethane. The reaction mechanism was postulated. The experimental data were simu lated with IBM-PC computer. The kinetic parameters of the elementary steps were obtained. The activation enthalpy △~≠H_m and activation entropy △~≠S_m and standard molar enthalpy change ΔH_m and standard molar entropy change ΔS_m of the elementary steps were calculted. The effect of various ligands on the rate of reaction was also examined.

Key words: meso-tetramesitylporphinatoiron(III) chloride, Oxidative decomposition, Reaction mechanism, β-Carotene