Abstract
The local registry and orientation of chemisorbed 3-methylthiophene and 3-methoxythiophene on Cu(111) has been determined using normal incidence X-ray standing wavefield absorption and near edge X-ray absorption fine structure spectroscopy, respectively. 3-methylthiohene and 3-methoxythiophene have, within experimental error, identical local registries (atop), Cu−S separations (2.57 ± 0.03 and 2.55 ± 0.05 Å), and orientations (24 ± 4° and 26 ± 4°). These results are placed in context with previous studies of thiophene and 3-chlorothiophene and provide quantitative information on how simple substituents affect the adsorption structure of the thiophene ring.
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