A spectroelectrochemical sensor was developed for [Re(dmpe)3]+ as a non radioactive analog for [Tc(dmpe)3]+. The sensor consists of an optically transparent electrode (OTE) coated with a thin film of sulfonated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SSEBS). Colorless [Re(dmpe)3]+ was reversibly oxidized to [Re(dmpe)3]2+ (?max = 530 nm). [Re(dmpe)3]+ preconcentrated by ion-exchange into the SSEBS film, resulting in a 20-fold increase in peak current compared to a bare OTE after 1 h of exposure to aqueous [Re(dmpe)3]+ solution. Detection of [Re(dmpe)3]+ at concentrations down to 2 x 10 6 M was accomplished by electrochemical modulation of the complex and monitoring absorbance by attenuated total reflectance (ATR).
Revised: September 14, 2011 |
Published: October 1, 2009
Citation
Morris L.K., C.J. Seliskar, W.R. Heineman, A.S. Del Negro, and S.A. Bryan. 2009.Absorbance-based spectroelectrochemical sensor for [Re(dmpe)3]+ (dmpe = dimethylphosphinoethane).Electroanalysis 21, no. 19:2091-2098.PNNL-SA-66257.doi:10.1002/elan.200904651