Synthesis, aggregation, electrocatalytic activity, and redox properties of a tetranuclear cobalt phthalocyanine

1987 ◽  
Vol 26 (6) ◽  
pp. 891-899 ◽  
Author(s):  
W. A. Nevin ◽  
W. Liu ◽  
S. Greenberg ◽  
M. R. Hempstead ◽  
S. M. Marcuccio ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Redox Properties ◽  
Cobalt Phthalocyanine

ChemInform Abstract: Synthesis, Aggregation, Electrocatalytic Activity, and Redox Properties of a Tetranuclear Cobalt Phthalocyanine.

ChemInform ◽  
1987 ◽  
Vol 18 (31) ◽  
Author(s):  
W. A. NEVIN ◽  
W. LIU ◽  
S. GREENBERG ◽  
M. R. HEMPSTEAD ◽  
S. M. MARCUCCIO ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Redox Properties ◽  
Cobalt Phthalocyanine

Surface electrochemistry of N,N',N″,N‴-tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt(II)

2006 ◽  
Vol 10 (10) ◽  
pp. 1238-1248 ◽  
Author(s):  
Junsheng Chen ◽  
Jiujun Zhang ◽  
Yu-Hong Tse ◽  
Pavel Janda ◽  
Dharamdat Christendat ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Electrocatalytic Activity ◽  
Positive Charge ◽  
Graphite Electrode ◽  
Cobalt Phthalocyanine ◽  
Central Metal ◽  
Spontaneous Reduction ◽  
Surface Electrochemistry ◽  
Peroxide Reduction ◽  
Concerted Processes

The complex N,N',N″,N‴ -tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt(II) ([ Co II TMPz [4+])4+ adsorbed on a graphite electrode undergoes spontaneous reduction, forming a surface containing Co I. Five reversible surface peaks are observed at low pH, two of which are two-electron concerted processes. At high pH, one of these two-electron processes splits into two one-electron waves. Both oxidation and reduction of the central metal can be observed, along with successive reduction steps involving the porphyrazine ligand. Notable is the marked shift to positive potentials of these processes, relative to unsubstituted cobalt phthalocyanine, due to the positive charge localized on the porphyrazine. The electrocatalytic activity of this complex modified electrode toward the reduction of hydrogen peroxide is also reported. We demonstrate that a series of different surfaces exist which are obtained by variation of pH and polarization potential and that these surfaces possess differing electrocatalytic activity. Surfaces inactive to hydrogen peroxide can exist at potentials more negative than active surfaces even though the driving force for peroxide reduction will be greater for the former.

Nanostructured cobalt phthalocyanine single-walled carbon nanotube platform: electron transport and electrocatalytic activity on epinephrine

2008 ◽  
Vol 12 (12) ◽  
pp. 1289-1299 ◽  
Author(s):  
Bolade O. Agboola ◽  
Alfred Mocheko ◽  
Jeseelan Pillay ◽  
Kenneth I. Ozoemena
Keyword(s):  
Carbon Nanotubes ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Pyrolytic Graphite ◽  
Single Walled Carbon Nanotubes ◽  
Cobalt Phthalocyanine ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The fabrication, characterization and application of edge-plane pyrolytic graphite electrode modified with acid-functionalized single-walled carbon nanotubes, nanostructured cobalt phthalocyanine and a mixture of both, towards epinephrine detection and analysis are described. The morphological features of the films were evaluated using atomic force microscopy (AFM). Electrochemistry of these electrodes in [ Fe ( CN )6]3−/4− using cyclic voltammetry and electrochemical impedance spectroscopy showed higher peak current responses with accompanying low electron-transfer resistances in comparison to the bare electrode. The edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode exhibited good electrocatalytic activity towards epinephrine oxidation with enhanced peak currents. Analytical studies using edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode proved that the electrode is suitable for sensitivity determination of epinephrine in pH 5 conditions judging from the good sensitivity (8.71 ± 0.31 A.M−1), and limit of detection (0.04 µM) and quantification (1.31 µM) obtained. Determination of EP in the absence and presence of ascorbic acid in phosphate buffer pH 5 conditions was carried out and it was established that the presence of AA did not interfere in EP analysis. Rotating disk electrode experiments proved that the catalytic rate constant was 2.28 × 1016 mM−1.s−1.

Tuning the redox properties of metalloporphyrin- and metallophthalocyanine-based molecular electrodes for the highest electrocatalytic activity in the oxidation of thiols

2007 ◽  
Vol 9 (26) ◽  
pp. 3383 ◽  
Author(s):  
Fethi Bedioui ◽  
Sophie Griveau ◽  
Tebello Nyokong ◽  
A. John Appleby ◽  
Claudia A. Caro ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Redox Properties

Comparative study of the electrocatalytic activity of cobalt phthalocyanine and cobalt naphthalocyanine for the reduction of oxygen and the oxidation of hydrazine

1998 ◽  
Vol 43 (12-13) ◽  
pp. 1821-1827 ◽  
Author(s):  
M. Isaacs ◽  
M.J. Aguirre ◽  
A. Toro-Labbé ◽  
J. Costamagna ◽  
M. Páez ◽  
...  
Keyword(s):  
Comparative Study ◽  
Electrocatalytic Activity ◽  
Cobalt Phthalocyanine
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