The Role of the pi Acceptor Character of Polypyridine Ligands on the Electrochemical Response of Co(II) Complexes and its Effect on the Homogenous Electron Transfer Rate Constant with the Enzyme Glucose Oxidase
Por:
RamirezDelgado, V, CruzRamirez, M, HernandezAyala, LF, ReyesVidal, Y, Patakfalvi, R, GarciaRamos, JC, Tenorio, FJ, RuizAzuara, L, OrtizFrade, L
Publicada:
1 oct 2015
Categoría:
Chemistry (miscellaneous)
Resumen:
In this work the electrochemical behavior of Co(II) complexes with
substituted bidentate and tridentate polypyridine ligands
[CoL3](BF4)(2) and [CoL'(2)](NO3)(2) in 0.1M phosphate buffer pH 7.2
was studied. A reversible electrochemical process Co(II)L-n -> Co(III)
L-n + 1e(-) was observed. A linear relationship between the redox
potential (E degrees) and the pKa of the non-coordinated ligand was
found. It was demonstrated by DFT calculations the use of pKa value as a
descriptor of the pi acceptor character of a ligand. The electrochemical
response in the presence of glucose oxidase (GOx) was also studied. It
was possible to establish a tendency between the homogeneous electron
transfer rate constant (ks) and the redox potential (E degrees) for the
compounds studied in this work and other examples taken from the
literature.
Filiaciones:
RamirezDelgado, V:
Ctr Invest & Desarrollo Tecnol Electroquim SC, Dept Electroquim, Pedro De Escobedo 76703, Queretaro, Mexico
CruzRamirez, M:
Ctr Invest & Desarrollo Tecnol Electroquim SC, Dept Electroquim, Pedro De Escobedo 76703, Queretaro, Mexico
HernandezAyala, LF:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Inorgan & Nucl, Lab Quim Inorgan Med, Ave Univ 3000,Ciudad Univ, Mexico City 04510, DF, Mexico
ReyesVidal, Y:
Catedra Conacyt CIDETEQ, Pedro Escobedo, Queretaro, Mexico
Ctr Invest & Desarrollo Tecnol Electroquim SC, Dept Electroquim, Pedro De Escobedo 76703, Queretaro, Mexico
Patakfalvi, R:
Univ Guadalajara, Ctr Univ Lagos, Dept Ciencias Tierra & Vida, Lagos De Moreno 47460, Jalisco, Mexico
GarciaRamos, JC:
Univ Nacl Autonoma Mexico, Inst Quim, Dept Fisicoquim, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Inorgan & Nucl, Lab Quim Inorgan Med, Ave Univ 3000,Ciudad Univ, Mexico City 04510, DF, Mexico
Tenorio, FJ:
Univ Guadalajara, Ctr Univ Lagos, Dept Ciencias Exactas & Tecnol, Lagos De Moreno, Jalisco, Mexico
RuizAzuara, L:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Inorgan & Nucl, Lab Quim Inorgan Med, Ave Univ 3000,Ciudad Univ, Mexico City 04510, DF, Mexico
OrtizFrade, L:
Ctr Invest & Desarrollo Tecnol Electroquim SC, Dept Electroquim, Pedro De Escobedo 76703, Queretaro, Mexico
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