Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA.
J Phys Chem B. 2010 Nov 18;114(45):14189-93. doi: 10.1021/jp9083579. Epub 2009 Nov 13.
We report on the experimental studies of single molecule conductance of 1,2-bi(pyridin-4-yl)ethyne (BPY-EY) and perfluoro-1,2-bi(pyridin-4-yl)ethyne (PFBPY-EY). The conductance measurements of the molecules bridging two Au electrodes have been carried out in toluene solutions using the scanning tunneling microscopy (STM) based break junction technique. Two conductance values of (2.2 ± 0.5) × 10(-4) and (5.0 ± 0.8) × 10(-5) G(0) have been found for BPY-EY but only one, (4.2 ± 0.5) × 10(-5) G(0), for PFBPY-EY. The disparity is attributed to steric differences between the molecules at the electrode.
我们报告了 1,2-双(吡啶-4-基)乙炔 (BPY-EY) 和全氟-1,2-双(吡啶-4-基)乙炔 (PFBPY-EY) 单分子电导的实验研究。使用基于扫描隧道显微镜 (STM) 的断键技术，在甲苯溶液中对桥接两个 Au 电极的分子的电导进行了测量。对于 BPY-EY，我们发现了两个电导值 (2.2 ± 0.5) × 10(-4) 和 (5.0 ± 0.8) × 10(-5) G(0)，但对于 PFBPY-EY，只发现了一个，(4.2 ± 0.5) × 10(-5) G(0)。这种差异归因于分子在电极处的空间位阻差异。
