TY - JOUR
T1 - Absorption and electrochemical properties of cobalt and iron phthalocyanines and their quaternized derivatives
T2 - Aggregation equilibrium and oxygen reduction electrocatalysis
AU - Tasso, Thiago Teixeira
AU - Furuyama, Taniyuki
AU - Kobayashi, Nagao
PY - 2013/8/19
Y1 - 2013/8/19
N2 - The synthesis and investigation of the electronic properties of Co(II) and Fe(II)tetrakis(pyridine-3-yloxy)phthalocyanines, as well as the respective quaternized complexes, are reported here. After quaternization reaction, the compounds showed increased solubility in water, and their aggregation equilibrium was analyzed by varying the solution concentration, pH, and composition. Cyclic voltammograms of the four compounds showed both metal and ring centered redox processes, with the former being highly sensitive to methylation of the pyridyl groups. The catalytic effect of the phthalocyanines adsorbed on glassy carbon electrodes in the oxygen reduction reaction (ORR) was investigated by cyclic voltammetry (CV) and rotating disk voltammetry (RDV). The highest catalytic activities were observed for the Fe(II) complexes in alkaline media, and a 2 + 2 mechanism, which consists of a first complete O2 to H2O2 process and a subsequent incomplete H 2O2 to H2O process, is proposed.
AB - The synthesis and investigation of the electronic properties of Co(II) and Fe(II)tetrakis(pyridine-3-yloxy)phthalocyanines, as well as the respective quaternized complexes, are reported here. After quaternization reaction, the compounds showed increased solubility in water, and their aggregation equilibrium was analyzed by varying the solution concentration, pH, and composition. Cyclic voltammograms of the four compounds showed both metal and ring centered redox processes, with the former being highly sensitive to methylation of the pyridyl groups. The catalytic effect of the phthalocyanines adsorbed on glassy carbon electrodes in the oxygen reduction reaction (ORR) was investigated by cyclic voltammetry (CV) and rotating disk voltammetry (RDV). The highest catalytic activities were observed for the Fe(II) complexes in alkaline media, and a 2 + 2 mechanism, which consists of a first complete O2 to H2O2 process and a subsequent incomplete H 2O2 to H2O process, is proposed.
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U2 - 10.1021/ic4002048
DO - 10.1021/ic4002048
M3 - Article
C2 - 23914935
AN - SCOPUS:84882626896
VL - 52
SP - 9206
EP - 9215
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 16
ER -