Pang, CL and Watkins, M and Cabailh, G and Ferrero, S and Ngo, LT and Chen, Q and Humphrey, DS and Shluger, AL and Thornton, G (2010) Bonding of Methyl Phosphonate to TiO2(110). J PHYS CHEM C , 114 (40) 16983 - 16988. 10.1021/jp1018923.
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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  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).
|Title:||Bonding of Methyl Phosphonate to TiO2(110)|
|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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