20 August 2009 Direction-dependent intermolecular interactions: catechol on TiO2(110)-1×1
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Abstract
The adsorption of a submonolayer of catechol (C6H6O2) on the rutile TiO2(110)-1×1 surface has been investigated by Scanning Tunneling Microscopy (STM). The catechol molecules are preferentially adsorbed on the surface 5-fold coordinated Ti4+ sites, and occupy two neighboring lattice Ti sites. No preference for adsorption at surface step edges is observed at room temperature. A statistical analysis of intermolecular distances demonstrates that the interaction between the molecules strongly depends on the surface crystallographic direction: catechol molecules exhibit attractive interaction along [1-1 0], while they repel each other along the [001] direction. The attractive interaction is proposed to be caused by the coupling of π bonding electrons and the repulsive interaction is possibly mediated by substrate.
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Shao-Chun Li, Ulrike Diebold, "Direction-dependent intermolecular interactions: catechol on TiO2(110)-1×1", Proc. SPIE 7396, Physical Chemistry of Interfaces and Nanomaterials VIII, 73960P (20 August 2009); doi: 10.1117/12.828204; https://doi.org/10.1117/12.828204
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