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).
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