The characterization of 5-{[4-(4-mercapto)phenylmethoxy]phenyl}-10,15,20-tris(phenyl)porphyrin cobalt(II) self-assembled monolayers (SAMs) and its electrocatalytic oxidation for ascorbic acid

A gold electrode modified by 5-{[4-(4-mercapto)phenylmethoxy]phenyl}-10,15,20-tris(phenyl)porphyrin cobalt(II) (MPPTPCo(II)) has been prepared. The properties of the modified electrode were investigated by scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) as well as electrochemical methods. The MPPTPCo(II)-SAM (SAM: self-assembled monolayer) modified electrode could successfully be used for the electrocatalytic oxidation of ascorbic acid (AA). The catalytic currents increased linearly with AA concentration in the range of <F>1.2×10−8</F>–<F>3.9×10−5</F> mol l−1 with the correlation coefficient of 0.9944. The detection limit was <F>2.6×10−9</F> mol l−1 with 10 min accumulation. [Copyright &y& Elsevier]