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Issue 18, 2013
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Adsorption of diferrocenylacetylene on Au(111) studied by scanning tunneling microscopy

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Abstract

Scanning tunneling microscopy images of diferrocenylacetylene (DFA) coadsorbed with benzene on Au(111) show individual and close-packed DFA molecules, either adsorbed alongside benzene or on top of a benzene monolayer. Images acquired over a range of positive and negative tip–sample bias voltages show a shift in contrast, with the acetylene linker appearing brighter than the ferrocenes at positive sample bias (where unoccupied states primarily contribute) and the reverse contrast at negative bias. Density functional theory was used to calculate the electronic structure of the gas-phase DFA molecule, and simulated images produced through two-dimensional projections of these calculations approximate the experimental images. The symmetry of both experimental and calculated molecular features for DFA rules out a cis adsorption geometry, and comparison of experiment to simulation indicates torsion around the inter-ferrocene axis between 90° and 180° (trans); the cyclopentadienyl rings are thus angled with respect to the surface.

Graphical abstract: Adsorption of diferrocenylacetylene on Au(111) studied by scanning tunneling microscopy

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Publication details

The article was received on 17 Jan 2013, accepted on 18 Mar 2013 and first published on 19 Mar 2013


Article type: Paper
DOI: 10.1039/C3CP50225B
Citation: Phys. Chem. Chem. Phys., 2013,15, 6973-6981
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    Adsorption of diferrocenylacetylene on Au(111) studied by scanning tunneling microscopy

    R. C. Quardokus, N. A. Wasio, R. P. Forrest, C. S. Lent, S. A. Corcelli, J. A. Christie, K. W. Henderson and S. Alex Kandel, Phys. Chem. Chem. Phys., 2013, 15, 6973
    DOI: 10.1039/C3CP50225B

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