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• W1970600830 abstract "We compare scanning tunneling microscopy (STM) imaging with single-molecule conductive atomic force microscopy (C-AFM) measurements by probing a series of structurally related thiol-terminated oligo(phenylenevinylene)s (OPVs) designed to have unique charge-transport signatures. When one or two methylene spacers are inserted between the thiol points of attachment and the OPV core, a systematic reduction in the imaged molecular transconductance and the current transmitted through a metal−molecule−metal junction containing the molecule is observed, indicating good agreement between STM and C-AFM measurements. However, a structure where the OPV backbone is interrupted by a [2.2]paracyclophane core has a low molecular transconductance, as determined from STM images, and a high measured single-molecule conductance. This apparent disconnect can be understood by comparing the calculated molecular orbital topology of the OPV with one thiol bound to a gold surface (the geometry in the STM experiment) with the topology of the molecule with both thiol termini bound to gold (relevant to C-AFM). In the former case, a single contact splits low-lying molecular orbitals into two discrete fragments, and in the latter case, molecular orbitals that span the entire molecule are observed. Although the difference in observed conductance between the two different measurements is resolved, the overall set of observations highlights the importance of using combined techniques to better characterize charge-transport properties relevant to molecular electronics." @default.
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• W1970600830 date "2006-08-01" @default.
• W1970600830 modified "2023-10-16" @default.
• W1970600830 title "Single-Molecule Charge-Transport Measurements that Reveal Technique-Dependent Perturbations" @default.
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• W1970600830 doi "https://doi.org/10.1021/ja062898j" @default.
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