PERIPHERAL CHARGE EFFECTS ON THE KINETICS OF ZN(II)-PORPHYRIN SYSTEM

被引：46

作者：

THOMPSON, AN

KRISHNAMURTHY, M

机构：

[1] Department of Chemistry, Howard University, Washington

来源：

JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY | 1979年 / 41卷 / 08期

基金：

美国国家科学基金会; 美国国家卫生研究院;

关键词：

D O I：

10.1016/0022-1902(79)80497-2

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Kinetics of the reaction between Zn(II) ion and the peripherally positively charged tetra-(p-trimethylammoniumphenyl)porphyrin (H2TAPP) were investigated at 30°C and 0.5°F ionic strength (NaNO3). The reaction was found to be first order in Zn(II) ion and porphyrin concentration. The specific rate constant for the reaction, if the reacting species were [Zn(OH)+], is 210±30M -1 sec-1 in comparison with 1.50±0.10 M-1 sec-1 determined for the reaction of Zn2+. Both these rates are faster than the corresponding rates for the reaction of a negatively charged tetra-(p-sulfophenyl)porphyrin (H2TPPS). But the demetallation reaction of Zn(II)TAPP is about eight times slower than that of Zn(II)TPPS. No unusual anion dependence of the reaction is observed. Isotope effect and activation parameters of these reactions are presented. © 1979.

引用

页码：1251 / 1255

页数：5

共 21 条

[1]

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