STM studies on monolayers of [Co(L)4]A8 metallogrids on graphite

Semenov, Alexander; Spatz, Joachim P.; Lehn, Jean-Marie; Weidl, Christian H.; Schubert, Ulrich S.; Möller, Martin

doi:10.1016/S0169-4332(98)00919-2

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STM studies on monolayers of [Co(L)4]A8 metallogrids on graphite

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Spatz, Joachim P.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
Biophysical Chemistry, Institute of Physical Chemistry, University of Heidelberg, 69120 Heidelberg, Germany;

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http://www.sciencedirect.com/science/article/pii/S0169433298009192/pdfft?md5=f9d04e1ed08aba42e23d9f3e1f7ffdc9&pid=1-s2.0-S0169433298009192-main.pdf
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http://dx.doi.org/10.1016/S0169-4332(98)00919-2
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Citation

Semenov, A., Spatz, J. P., Lehn, J.-M., Weidl, C. H., Schubert, U. S., & Möller, M. (1999). STM studies on monolayers of [Co(L)4]A8 metallogrids on graphite. Applied Surface Science, 144-145, 456-460. doi:10.1016/S0169-4332(98)00919-2.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-4708-F

Abstract

Self-assembled tetranuclear complexes of metallogrid type [Co4(L4)](PF6), R1=CH3, R2=H (compound 1) and [Co4(L4)](AsF6), R1=H, R2=CH3 (compound 2), L=4,6-bis(611R1-21,21-bipyrid-6-yl)-2-R2-pyrimidine were adsorbed onto highly oriented pyrolitic graphite and studied by STM. Monodomains of a regularly packed layer of adsorbed molecules with areas up to 0.5 μm2 were observed. Sample 1 showed a molecular pattern with nearly orthogonal periodicities of 1.35 nm×2.6 nm consisted with the size of the 2×2 Co-grid oriented normally to the surface. A periodicity of 2.5 nm×2.4 nm was found for complex 2 consistent with orientation of the grid parallel to the surface. Holes in the monolayer, which were formed by removal of a particular complex by STM, were observed to diffuse along the surface with a diffusion coefficient of D=5.2×10−16 cm2/s. The free energy of the diffusion activation were found to be ΔFd=730 meV.