Metal (Co, Fe) tribenzotetraazachlorin-fullerene conjugates: Impact of direct π-bonding on the redox behaviour and oxygen reduction reaction

被引：19

作者：

Ozoemena, Kenneth I. ^{[1
,2
]}

Mamuru, Solomon A. ^{[2
]}

Fukuda, Takamitsu ^{[3
]}

Kobayashi, Nagao ^{[3
]}

Nyokong, Tebello ^{[4
]}

机构：

[1] CSIR, ZA-0001 Pretoria, South Africa

[2] Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa

[3] Tohoku Univ, Grad Sch Sci, Dept Chem, Sendai, Miyagi 9808578, Japan

[4] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 06期

关键词：

Metal; (Fe; Co); phthalocyanine-C-60; Cyclic voltammetry; RDE experiment; Oxygen reduction; VOLTAMMETRIC DETERMINATION; ELECTROCHEMICAL PROPERTIES; PHTHALOCYANINE; ELECTROREDUCTION;

D O I：

10.1016/j.elecom.2009.04.011

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Novel hexabutylsulphonyltribenzotetraazachlorin-fullerene (C-60) complexes of iron (FeHBSTBTAC-C-60) and cobalt (CoHBSTBTAC-C-60) have been synthesized and their electrochemistry and oxygen reduction reaction (ORR) compared with their octabutylsulphonylphthalocyanine analogues (FeOBSPc and CoOBSPc). It is proved that electron-withdrawing substituents (-SO2Bu and C60) on phthalocyanine macrocycle exhibit distinct impact on the solution electrochemistry of these metallophthalocyanine (MPc) complexes. The more electron-withdrawing C-60 substituent suppressed ORR compared to the -SO2Bu in alkaline medium. FeOBSPc showed the best ORR activity involving a direct 4-electron mechanism, a rate constant of similar to 1 x 10(8) cm(3) mol(-1) s(-1) and a Tafel slope of -171 mV dec(-1). (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1221 / 1225

页数：5

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