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Cross-Step Place-Exchange of Oligo(phenylene−ethynylene) Molecules

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Departments of Chemistry and Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, and Department of Chemistry and Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005-1892
Cite this: Nano Lett. 2005, 5, 11, 2292–2297
Publication Date (Web):October 18, 2005
Copyright © 2005 American Chemical Society

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    Abstract Image

    We have observed nitro-functionalized oligo(phenylene−ethynylene) molecules exhibiting motion up and down Au{111} substrate monatomic step edges within host self-assembled monolayers of n-alkanethiols, independent of previously observed conductance switching. Single molecules have been imaged with scanning tunneling microscopy to place-exchange reversibly between the top and bottom of monatomic substrate step edges.

     The Pennsylvania State University.

     Current address:  Geo-Centers, Research and Development Center, Manassas, VA 20110.


     Current address:  Department of Chemistry, Vassar College, Poughkeepsie, NY 12604.

     Rice University.


     Corresponding authors. E-mail:  [email protected], [email protected].

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    Additional histograms for molecules inserted into a decanethiolate SAM and into an octanethiolate SAM. This material is available free of change via the Internet at

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