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Bonding of Methyl Phosphonate to TiO2(110)

Pang, CL; Watkins, M; Cabailh, G; Ferrero, S; Ngo, LT; Chen, Q; ... Thornton, G; + view all (2010) Bonding of Methyl Phosphonate to TiO2(110). J PHYS CHEM C , 114 (40) 16983 - 16988. 10.1021/jp1018923.

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Abstract

We have used scanning tunneling, microscopy (STM), noncontact atomic force microscopy (NC-AFM), low energy electron diffraction (LEED), and ab initio calculations to study adsorbates resulting from exposure of rutile TiO2(110)1 x 1 to methyl phosphonic acid (Ch(3)P=O(OH)(2)). At low exposures, adsorbates appear on the 5-fold coordinated Ti (Ti-5c) rows. As the coverage of adsorbates approaches 0.5 ML. STM images show an ordered 2 x 1 overlayer consistent with LEED. We propose that the phosphonic acid is deprotonated with the resulting phosphonate bridging across two adjacent Ti-5c atoms in the [001] direction. This bridging conformation would lead to the observed 2 x 1 overlayer and is analogous to that found for a range of carboxylates adsorbed on TiO2(110).

Type:Article
Title:Bonding of Methyl Phosphonate to TiO2(110)
DOI:10.1021/jp1018923
Keywords:SCANNING TUNNELING MICROSCOPE, RUTILE TIO2(110), TIO2, ADSORPTION, SURFACE, MOLECULES, OXIDE, ACID, PSEUDOPOTENTIALS, REACTIVITY
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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