Département de chimie moléculaire

The complexing properties of poly(3-(pyrrol-1-yl)propylmalonic acid) (poly1) and poly(N,N'-ethylenebis(N-(3-(pyrrole-1-yl)propyl) carbamoyl)Me)-glycine (poly2) coated electrodes (C|poly1 and C|poly2) towards Cu(II), Pb(II), Hg(II) and Cd(II) cations using the open circuit chem. preconcn.-anodic stripping technique were studied. Sorption process of metal cations onto complexing surfaces was readily studied through the combination of a chem. pre-concn.-anodic stripping technique with a Langmuir isotherm model. The modified electrodes were used for the voltammetric detn. of Cu(II), Pb(II), Hg(II) and Cd(II) ions, giving low detection limits for Cu(II) (5 × 10-9 mol L-1) and Pb(II) (5 × 10-10 mol L-1). The ability of the modified electrodes to analyze Cu(II) ions in natural sample was demonstrated by the anal. of a tap water sample. The results of the preconcn. process under competitive conditions clearly shows that the selectivity of complexing mol. electrode materials can be subtly tuned upon playing on the accumulation time, polymer thickness and/or memory effect of the binding polymers, opening up new avenues towards evolutive and efficient smart sensing materials. [on SciFinder(R)]