期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 38, 页码 11889-11892出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b06180
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资金
- Deutsche Forschungsgemeinschaft [AM 460/2-1, MO 2345/4-1, FU 299/19]
- Deutsche Forschungsgemeinschaft through collaborative research center SFB 858
Tuning the binding mode of N-heterocyclic carbenes on metal surfaces is crucial for the development of new functional materials. To understand the impact of alkyl side groups on the formation of NHC species at the Au(111) surface, we combined scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory calculations. We reveal two significantly different binding modes depending on the alkyl chain length. In the case of a short alkyl substituent, an up-standing configuration with one Au adatom is preferred, whereas the longer alkyl groups result exclusively in NHC-Au-NHC complexes lying flat on the surface. Our study highlights how well-defined structural modifications of NHCs allow for controlling the local binding motif on surfaces, which is important to design designated catalytic sites at interfaces.
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