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Absorbance‐Based Spectroelectrochemical Sensor for [Re(dmpe) 3 ] + (dmpe=dimethylphosphinoethane)
Author(s) -
Morris Laura K.,
Seliskar Carl J.,
Heineman William R.,
Del Negro Andrew S.,
Bryan Samuel A.
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200904651
Subject(s) - absorbance , chemistry , polystyrene , electrode , ethylene , aqueous solution , analytical chemistry (journal) , chromatography , catalysis , organic chemistry , polymer
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+ ( λ 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 2×10 −6 M was accomplished by electrochemical modulation of the complex and monitoring absorbance by attenuated total reflectance (ATR).