AVS 57th International Symposium & Exhibition
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP20
One-dimensional Coordination Chains of 4,4’-azopyridine on Cu(100) by Self-assembly

Tuesday, October 19, 2010, 6:00 pm, Room Southwest Exhibit Hall

Session: Surface Science Poster Session
Presenter: H.A. Lim, Indiana University
Authors: H.A. Lim, Indiana University
S.L. Tait, Indiana University
Correspondent: Click to Email
We have observed highly-ordered 1D chains of 4,4’-azopyridine (AZPY) formed by self-assembly on the pristine Cu(100) surface at room temperature. AZPY is of particular interest as a building block due to its π-conjugated system, photoactive azo site and coordinative bonding with transition metals in metal organic framework materials. Scanning tunneling microscopy shows that the APY molecules grow in one-dimensional chains, mostly starting from copper step edges, with an end-to-end pyridine-Cu-pyridine interaction. The APY chain structure, oriented along the [110] direction, is a significant departure from the side-to-side molecular arrangement in self-assembled azobenzene chains at surfaces. As the coverage increased mobile molecules are observed to be confined inside 2D APY corrals composed of a framework of intersecting chains. X-ray photoelectron spectroscopy is also used for characterization. Further studies are underway to investigate these assemblies on other surfaces as well as functionality of these systems for applications such as nano-electronics, molecular magnetism and single-site heterogeneous catalysis.