C–Au Covalently Bonded Molecular Junctions Using Nonprotected Alkynyl Anchoring Groups

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• 作者：Ignacio José Olavarria-Contreras ; Mickael L. Perrin ; Zhi Chen ; Svetlana Klyatskaya ; Mario Ruben ; Herre S. J. van der Zant
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：138
• 期：27
• 页码：8465-8469
• 全文大小：334K
• 年卷期：0
• ISSN：1520-5126

文摘

We report on an approach to realize carbon–gold (C–Au) bonded molecular junctions without the need for an additive to deprotect the alkynyl carbon as endstanding anchor group. Using the mechanically controlled break junction (MCBJ) technique, we determine the most probable conductance value of a family of alkynyl terminated oligophenylenes (OPA(n)) connected to gold electrodes through such an akynyl moiety in ambient conditions. The molecules bind to the gold leads through an sp-hybridized carbon atom at each side. Comparing our results with other families of molecules that present organometallic C–Au bonds, we conclude that the conductance of molecules contacted via an sp-hybridized carbon atom is lower than the ones using sp<sup>3sup> hybridization due to strong differences in the coupling of the conducting orbitals with the gold leads.