高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (4): 421.

• 论文 •    下一篇

薄层光谱电化学法测定辅酶B12模型化合物的生成速率常数

郑国栋, 孙浩然, 曹锡章   

  1. 吉林大学化学系, 长春, 130023
  • 收稿日期:1991-01-03 出版日期:1992-04-24 发布日期:1992-04-24
  • 通讯作者: 郑国栋
  • 基金资助:

    国家自然科学基金

Measurement of the Formation Rate Constants of-Coenzyme B12 Models by Thin Layer Spectroelectrochemistry

ZHENG Guo-dong, SUN Hao-ran, CAO Xi-zhang   

  1. Department of Chemistry, Jilin University, Changchun, 130023
  • Received:1991-01-03 Online:1992-04-24 Published:1992-04-24

摘要: 用薄层光谱电化学方法和单电位-计时吸收光谱法(SPS-CA),测得钴四苯基卟啉(CoTPP)分别与碘甲烷、苄基氯和氯丁烷形成含σ钴-碳键辅酶B12模型化合物的速率常数为11.09、1.62×102和6.93×10-2mol-1·L·s-1。钴卟啉与这3种卤代烷的反应是二级反应,对各自的反应物Co(Ⅰ)TPP和卤代烷都是一级反应。

关键词: 辅酶B12, 速率常数, 光谱电化学, 卟啉

Abstract: The formation rate constants of coenzyme B12 model compounds produced through the reaction of [Co(I)TPP]- with PhCH2Cl, CH3I, CH3(CH2)3Cl was measured by thin layer spectroelectrochemistry i.e.single potential step chronoabsorptiometry(SPS-CA).Their values are 1.62 × 102 mol-1·L·s-1 for PhCH2Cl, 11.09 mol-1·L·s-1 for CH3Iand 6.93 × 10-2 mol-1·L·s-1 for CH3(CH2)3Cl respectively.These reactions are second order and first order in respect of [Co(I)TPP]- or RX.

Key words: Coenzyme B12, Rate constant, Spectroelectrochemistry, Porphyrin

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