VOLTAMMETRIC BEHAVIOR OF SILVER IONS AT A CARBON-PASTE ELECTRODE IN THE PRESENCE OF 2,5,8-TRITHIA[9]-M-CYCLOPHANE

The redox behavior of silver ion [Ag(I)] is studied at carbon paste el ectrodes (CPE) in presence of the macrocyclic ligand 2,5,8-trithia[9]- m-cyclophane (TTCP) in ethanol. The formation of a Ag(I) complex of th e TTCP is concluded from the appearance of two oxidation peaks and two corresponding reduction peaks at the CPE. Potentiostatic pretreatment (at potentials in the range from -0.4 V to +0.25 V) lends to the adso rption of the ligand as well as the deposition of Ag(0) at the electro de surface, which reacts then to the Ag(I) complex during the anodic c ycle. Thr results indicate that TTCP can be used as electrode modifier for the immobilization of silver at electrode surfaces.