Yuki Komoto, S. Fujii, K. Hara
Nov 7, 2013
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0
Influential Citations
25
Citations
Journal
Journal of Physical Chemistry C
Abstract
Single molecular junctions of benzene dihalide molecules (para-X–(C6H4)–X, X = Cl, Br, I) binding to Au electrodes were systematically studied by using the scanning tunneling microscopy break junction (STM-BJ) technique. The STM-BJ characterization revealed that the single molecular junction was formed only with 1,4-diiodobenzene, which was due to its ability to form particularly stable halogen bonds with Au electrodes for the iodide anchoring group. The conductance and strength of the metal–molecule bond of the single 1,4-diiodobenzene molecular junction were compared with that of 1,4-benzenediamine (para-H2N–(C6H4)–NH2). The conductance of a single 1,4-diiodobenzene molecular junction was 3.6 × 10–4 G0 (G0 = 2e2/h), which was smaller than 1 × 10–2 G0 measured for 1,4-benzenediamine. The distances to break single molecular junctions were 0.05 and 0.03 nm for single 1,4-diiodobenzene and 1,4-benzenediamine molecular junctions, respectively. The longer breakdown distance of the single 1,4-diiodobenzene mol...