Trimethylsilyl-Terminated Oligo(phenylene ethynylene)s: An Approach to Single-Molecule Junctions with Covalent Au鈥揅 蟽-Bonds

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• 作者：Wenjing Hong ; Hui Li ; Shi-Xia Liu ; Yongchun Fu ; Jianfeng Li ; Veerabhadrarao Kaliginedi ; Silvio Decurtins ; Thomas Wandlowski
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：November 28, 2012
• 年：2012
• 卷：134
• 期：47
• 页码：19425-19431
• 全文大小：363K
• 年卷期：v.134,no.47(November 28, 2012)
• ISSN：1520-5126

文摘

A new and efficient approach using cleaving of trimethylsilyl groups to create covalent Au鈥揅 anchoring sites has been developed for single-molecule junction conductance measurements. Employing the mechanically controllable break junction (MCBJ) technique in liquid, we demonstrate the formation of highly conducting single molecular junctions of several OPE derivatives. The created junctions are mechanically stable and exhibit conductances around one order of magnitude higher than those of their dithiol analogues. Extended assembly and reaction times lead to oligomerization. Combined STM imaging and gap-mode Raman experiments provide structure evidence to support the formation of covalent Au鈥揅 contacts and further oligomerization.