CONTROL OF PARTITIONING IN POLYMER-MODIFIED ELECTRODES IMPOSED BY CHEMICAL CROSS-LINKING, FOR THE SIMULTANEOUS MEASUREMENT OF NORMALLY INTERFERING ANALYTES

The redox polymer [Os(bipy)(2)(PVP)(10)Cl]Cl has been chemically cross-linked with p-dibromobenzene, 1,5-dibromopentane, and l,l0-dibromodecane from 1 to 20 mol % [bipy = 2,2'-bipyridyl, PVP = poly (4-vinylpyridine)]. The general electrochemistry, charge transport characteristics, and catalytic behavior of the material has been assessed. Cross-linking has a minimal effect on the general electrochemistry of the redox centers. However, partitioning of [Fe(III)] was physically prevented by use of 1,5-dibromopentane and 1,10-dibromodecane while reduced partitioning was evident for p-dibromobenzene cross-linked films, whereas the mediated reduction of NO2- was found to occur throughout the cross-linked polymer film. The possibility of using the different partition of these two analytes into the cross-linked polymers to simultaneously determine their concentration is demonstrated.