Effect of ligand nonplanarity and solvent nature on the kinetic stability of zinc porphyrin complexes

被引：6

作者：

Berezin, D. B. ^{[1
]}

Shukhto, O. V. ^{[1
]}

Shatunov, P. A. ^{[1
]}

机构：

[1] Ivanovo State Univ Chem Tecnol, Ivanovo 153000, Russia

来源：

RUSSIAN JOURNAL OF GENERAL CHEMISTRY | 2008年 / 78卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1134/S1070363208050277

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Planarity disturbance in metal porphyrin macrorings produces destabilization of complexes in dimethyl sulfoxide-acetic acid and benzene-acetic acid systems, except for cases where the coordination center is additionally stabilized by endocyclic substituents and/or extra ligands. The first dissociation stage of complexes with N-substituted analogs of porphyrins involves substitution of the acido ligand in the strongly shielded coordination sphere by an electron-donor solvent molecule. The revealed dependences of dissociation rate constants on acid concentration in DMSO, untypical of most metal porphyrins, are explained by a change in the type of the attacking species with changing solvent composition. The dissociation rate constants of complexes in an electron donor solvent can be lower by several orders of magnitude than in a weakly solvating medium.

引用

页码：997 / 1004

页数：8

共 22 条

[1]

Berezin B.D., 1999, USPEKHI KHIMII PORFI, V2, P128

[2]

Berezin B.D., 2002, ZH NEORG KHIM, V47, P1914

[3]

Berezin B.D., 2006, REAKTSII DISSOTSIATS

[4]

Berezin B. D., 1981, Coordination Compounds of Porphyrins and Phthalocyanines

[5]

BEREZIN DB, 2006, ZH OBSHCH KHIM, V76, P506

[6]

BEREZIN DB, 2007, THESIS IVANOVO

[7]

BEREZIN DB, 2003, KOORDINATS KHIM, V29, P574

[8] OCTABROMOTETRAPHENYLPORPHYRIN AND ITS METAL DERIVATIVES - ELECTRONIC-STRUCTURE AND ELECTROCHEMICAL PROPERTIES [J].

BHYRAPPA, P ;

KRISHNAN, V .

INORGANIC CHEMISTRY, 1991, 30 (02) :239-245

[9]

Fialkov Yu.Ya., 1990, RASTVORITEL KAK SRED

[10]

Ghosh A., 2000, The Porphyrin Handbook, V7, P1

← 1 2 3 →