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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Sensing of Molecular Chirality on an Electrode Modified with a Clay-Metal Complex Hybrid Film
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Sensing of Molecular Chirality on an Electrode Modified with a Clay-Metal Complex Hybrid Film

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A chiral sensing electrode has been prepared by coating an indium tin oxide (ITO) substrate with a hybrid film of metal complexes and a clay layer (montmorillonite).By applying the combined method of the Langmuir-Blodgett and self-assembly techniques,a monolayer of a water-soluble chiral metal complex (LAMBDA-Os(phen)_3~(2+)),which acted as a mediator of oxidizing a target molecule,was fixed electrostatically onto a single-layered clay film.Chiral sensing was demonstrated by monitoring a photocurrent when the electrode was in contact with an aqueous NaClO_4 solution of 1,1'-2-binaphthol.As a result,the S-1,1'-2-binaphthol gave a photocurrent 1.8 times higher than the R-isomer at the applied potential of 700 mV (vs AgAgClKCl-(sat)).Detection limit was determined to be 40muM from the concentration dependence of a response current.Mechanisms for chiral sensing effect were explained in terms of the stereoselective binding of 1,1'-2-binaphthol with adsorbed LAMBDA-Os(phen)_3~(2+) on a clay surface.

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