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Coupling of Ligand‐Catalyzed Electroreduction of Metal Ions with Redox Electrocatalysis. Application of the o ‐Catechol‐Ge(IV)‐V(IV) Double Catalytic System for the Sensitive Determination of o ‐Catechol
Author(s) -
Muñiz Álvarez Jesús L.,
García Calzón Josefa A.,
López Fonseca Juan M.
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200103)13:3<181::aid-elan181>3.0.co;2-f
Subject(s) - catechol , chemistry , electrocatalyst , catalysis , redox , overpotential , electrochemistry , cyclic voltammetry , inorganic chemistry , ligand (biochemistry) , voltammetry , metal , electrode , organic chemistry , biochemistry , receptor
The electrochemical behavior of the o ‐catechol‐Ge(IV)‐V(IV) system was studied by differential pulse and cyclic voltammetry in combination with a hanging mercury drop electrode. o ‐Catechol, at low concentrations, catalyzes the reduction of Ge(IV) (i.e., it decreases the overpotential required to reduce Ge(IV) species) through the formation of an adsorbed Ge(IV)‐ o ‐catechol catalytic complex. A large enhancement of the resulting peak currents is observed upon the addition of V(IV), as a consequence of the chemical regeneration of the catalytic complex. Thus, a coupling of redox and ligand‐induced types of electrocatalysis was achieved in solutions of o ‐catechol, Ge(IV) and V(IV). A possible mechanism for the double catalytic process has been proposed. Optimal conditions for rapid determination of o ‐catechol at concentrations within the range 5×10 −8 –5×10 −6 M were established.