Sensing of molecular chirality on an electrode modified with a clay-metal complex hybrid film

摘要: A chiral sensing electrode has been prepared by coating an indium tin oxide (ITO) substrate with a hybrid film of metal complexes and clay layer (montmorillonite). By applying the combined method Langmuir−Blodgett self-assembly techniques, monolayer water-soluble complex (Λ-[Os(phen)3]2+), which acted as mediator oxidizing target molecule, was fixed electrostatically onto single-layered film. Chiral demonstrated monitoring photocurrent when in contact aqueous NaClO4 solution 1,1‘-2-binaphthol. As result, S-1,1‘-2-binaphthol gave 1.8 times higher than R-isomer at applied potential 700 mV (vs Ag|AgCl|KCl(sat)). Detection limit determined to be 40 μM from concentration dependence response current. Mechanisms for effect were explained terms stereoselective binding 1,1‘-2-binaphthol adsorbed Λ-[Os(phen)3]2+ on surface.