AVS 60th International Symposium and Exhibition
    Surface Science Thursday Sessions
       Session SS-ThM

Paper SS-ThM10
Coverage Dependent Self-Assembled Structures of Glutaric Acid on Cu(110)

Thursday, October 31, 2013, 11:00 am, Room 202 A

Session: Chirality & Enantioselectivity on Surfaces
Presenter: E.H. Park, KAIST, Republic of Korea
Authors: E.H. Park, KAIST, Republic of Korea
S. Kim, KAIST, Republic of Korea
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We have investigated the adsorption structure of glutaric acid ( HOOC-( CH2)3-COOH ) on the Cu(110) surface as a function of coverage using Scanning Tunneling Microscopy and Reflection-Absorption IR Spectroscopy. At low coverage, glutaric acid molecules diffuse freely on Cu(110) surface at room temperature, thus they can’t form ordered structures at this coverage. However, novel structures have been formed under continuous scanning of the tip. We suggest that this new structures can be created by the field-induced self-assembly. As increasing coverage, glutaric acids are self-assembled by annealing at 450K. At 0.25ML, glutaric acid adsorbs with a bi-glutarate ( －OOC(CH2)3-COO- ) configuration producing a racemic conglomerate of coexisting mirror domains. Although the molecule is achiral, it forms chiral domains on the surface from adsorption-induced asymmetrization. At 0.5ML, two distinct adsorption configurations are observed which are chiral each other. Overall, the heterochiral structure with chiral chains alternating each other is created at this coverage forming zigzag structure, and still gltutaric acid adsorbs with a bi -glutarate configuration. Finally, at 1ML, glutaric acid adsorbs with a mono-glutarate configuration forming close packed structures.