化学学报 ›› 1993, Vol. 51 ›› Issue (3): 209-215.    下一篇

研究论文

金属离子与卟啉的嵌入反应动力学研究 4: Cu(II)Tβ-N-EAESPyP^4^+生成反应中的动力学盐效应

陈圣云;任建国;秦子斌   

  1. 武汉大学化学系
  • 发布日期:1993-03-15

Studies on kinetics of incorporation of metal ion into porphyrin. pt. 4: Kinetic salt effect in formation reaction of Cu(II) Tβ -N-EAESPyP^4^+

CHEN SHENGYUN;REN JIANGUO;QIN ZIBIN   

  • Published:1993-03-15

在不同离子强度的高氯酸钠水溶液中, 用分光光度法测量自由卟啉H2Ts-n-EAESPyPBr4(简记为H2P^4^+)与Cu(II)离子的配位反应动力学, 探讨高氯酸钠对Cu(II)离子嵌入自由卟啉反应的催化本质。在给定条件下, 高氯酸根与自由卟啉的缔合数n为1; 缔合平衡常数Ko=3.70±0.42dm^3.mol^-^1。配位反应实验动力学方程为d[Cu(II)P^4^+/dt=5.55×10^5γCu^2^+γH2P^4^+γ^8ClO4^-[ClO4^-]^3[Cu^2^+][H2P]总/(1.00+10^2^.^0^2{H^+}+10^4^.^3^6{H^+}^2, 反应的活化能E=53.30kJ.mol^-^1,活化焓变△H≠=50.31kJ.mol^-^1, 活化熵变△S≠=-77.65J.mol^-^1.K^-^1。提出了金属卟啉生成反应中的ClO4^-催化卟啉环变形的反应机理。

关键词: 分光光度法, 反应机理, 反应动力学, 铜, 高氯酸盐, 嵌入反应, 卟啉, 络合反应

Cu2+ reaction with I gave pH and ionic strength dependent kinetics. The equilibrium constant for association of I with ClO4- was determine spectroscopically to be 3.70 M-1 and the product had 1:1 stoichiometry. Temperature dependence of the kinetics yielded activation parameters and a mechanism involving porphyrin ring deformation is discussed.

Key words: SPECTROPHOTOMETRY, REACTION MECHANISM, REACTION KINETICS, COPPER, PERCHLORATE, INTERCALATION REACTION, PORPHYRIN, COMPLEX REACTION

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