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Catalytic behavior of osmium( II ), rhodium( III ) and ruthenium( II ) Phthalocyanines towards the electrooxidation of cysteine on glassy carbon electrodes
Author(s) -
Sekota Mantoa,
Nyokong Tebello
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140091608
Subject(s) - chemistry , ruthenium , catalysis , rhodium , osmium , cyanide , cysteine , glassy carbon , electrode , inorganic chemistry , medicinal chemistry , polymer chemistry , electrochemistry , cyclic voltammetry , organic chemistry , enzyme
Glassy carbon electrodes (GCE's) modified with phthalocyanine complexes of Rh, Ru and Os are employed for the catalytic oxidation of cysteine. When cyanide and dimethylsulfoxide (DMSO) are used as axial ligands giving (DMSO)(Cl)Rh III Pc, [(CN) 2 Rh III Pc] − , (DMSO) 2 OsPc II , and [(DMSO) 2 Ru(II)Pc]·2DMSO complexes, the peak currents for the oxidation of cysteine increase after each scan, indicating an increase in the catalytic activity of the electrode with repetitive scanning. This improvement in the catalytic activity of the GCE after the first scan is attributed to the formation of dimeric π cation radical species at the electrode surface.