Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (04): 312-318.doi: 10.3866/PKU.WHXB19940406

• ARTICLE • Previous Articles     Next Articles

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

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