Elsevier

Surface Science

Volume 471, Issues 1–3, 10 January 2001, Pages 163-169
Surface Science

Orientation of carboxylates on TiO2(1 1 0)

https://doi.org/10.1016/S0039-6028(00)00902-XGet rights and content

Abstract

C K-edge NEXAFS has been used to examine the orientation of formate, acetate and propanate in their 2×1 overlayers on TiO2(1 1 0) at 300 K. These data indicate that the carboxylate planes are more or less perpendicular to the surface. The off-normal tilt angles from NEXAFS are 20±10°, 0±5° and 14±10° for formate, acetate and propanate, respectively. The corresponding apparent twist angles out of the [0 0 1] azimuth are 29±10°, 26±5° and 39±10°, indicating a bond geometry essentially independent of the alkyl chain length. The apparent twist angles probably arise from averaging of majority and minority species.

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    1

    Present address: Department of Physics, UMIST, P.O. Box 88, Manchester M60 1QD, UK.

    2

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