Molecular chirality and charge transfer through self-assembled scaffold monolayers |
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Authors: | Wei J J Schafmeister C Bird G Paul A Naaman R Waldeck D H |
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Affiliation: | Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA. |
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Abstract: | The effect of molecular chirality on electron transmission is explored by photoelectrochemistry. Thiol-terminated chiral scaffold molecules containing a porphyrin chromophore were self-assembled on gold surfaces to form a monolayer. Incorporation of the SAM-coated gold into an electrochemical cell and illumination with visible light generated a cathodic photocurrent. When using circularly polarized light, the photocurrent displayed an asymmetry (different magnitude of photocurrent for right versus left polarization) that changed with the molecular chirality (left- or right-handedness of the scaffold). A symmetry constraint on the electronic coupling between the porphyrin and the organic scaffold is proposed as a possible mechanism for the photocurrent asymmetry. |
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