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Evaluation of Electrochemical Release of Self‐Assembled Reagents as a Component of a Preconcentrator for Flow‐Injection Analysis
Author(s) -
Cheng Long,
Seneviratne Janaki,
Pacey Gilbert E.,
Gord James R.,
Brown Michael S.,
Meyer Terrence S.,
Cox James A.
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200211)14:19/20<1339::aid-elan1339>3.0.co;2-t
Subject(s) - monolayer , analyte , reagent , electrochemistry , chemistry , self assembled monolayer , fluorescence , derivative (finance) , fluorescence spectroscopy , analytical chemistry (journal) , electrode , materials science , nanotechnology , chromatography , organic chemistry , physics , quantum mechanics , financial economics , economics
Demonstrated is that self‐assembled monolayers anchored to gold by a thiolate can trap an analyte and electrochemical release of the assembly into a carrier allows determination at a downstream detector. Quantitative potentiostatic release of a coumarin derivative is demonstrated by fluorometry. The capture of PMo 12 O 40 3− on a monolayer of 4‐aminothiophenol followed by oxidative release results in a 4.8 nA peak (1.6‐s width at 1 mL min −1 ) for the four‐electron reduction of PMo 12 O 40 3− . The sensitivity is increased by forming multilayers on the preconcentrator. Release of 10 layers of P 2 W 18 O 62 6− yields a 12.4 nA peak even though only a one‐electron reduction occurs at the potential employed.