Single-wall carbon nanotubes (SWCNTs) were used as an immobilization matrix to incorporate [Ir(ppy)2(phen-dione)](PF6) complex onto a glassy carbon electrode for the study of electrocatalytic reduction of periodate ion. Detailed preliminary electrochemical data for the Ir(III)-complex in acetonitrile solution and for the modified GCE/SWCNTs/[Ir(ppy)2(phen-dione)](PF6)/CGE are presented. The modified electrode was applied to selective amperometric detection of periodate through its electrocatalytic reduction to iodide at 0.200 V and pH 2.0. The use of amperometry resulted in two calibration plots over the concentration ranges of 1-20 μM and 20-450 μM, with a detection limit of 0.6 μM and sensitivity of 198 nAμM-1.
