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Absorbance‐Based Spectroelectrochemical Sensor for [Re(dmpe)3]+ (dmpe=dimethylphosphinoethane) |
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| Authors: | Laura?K Morris Carl?J Seliskar William?R Heineman Andrew?S Del?Negro Samuel?A Bryan |
| Institution: | 1. Department of Chemistry, University of Cincinnati, 301 Clifton Court, Cincinnati, OH 45221‐0172, USA;2. Pacific Northwest National Laboratory, Richland, WA 99352, USA |
| Abstract: | A spectroelectrochemical sensor was developed for Re(dmpe)3]+ as a nonradioactive 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+ (λmax=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 2×10?6 M was accomplished by electrochemical modulation of the complex and monitoring absorbance by attenuated total reflectance (ATR). |
| Keywords: | Spectroelectrochemical sensing Sulfonated polystyrene‐block‐poly(ethylene‐ran‐butylene)‐block‐polystyrene films Attenuated total reflectance spectroscopy (ATR) Thin films Radiopharmaceuticals |