Direction-dependent intermolecular interactions: catechol on TiO2(110)-1×1

Shao-Chun Li; Ulrike Diebold

doi:10.1117/12.828204

20 August 2009 Direction-dependent intermolecular interactions: catechol on TiO₂(110)-1×1

Shao-Chun Li, Ulrike Diebold

Proceedings Volume 7396, Physical Chemistry of Interfaces and Nanomaterials VIII; 73960P (2009) https://doi.org/10.1117/12.828204
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

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.

Citation Download Citation

Shao-Chun Li and 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); https://doi.org/10.1117/12.828204

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