The single molecular conductance of viologen derivative VSMe and supramolecular compound VSMe-PA[5] (pillararene[5]) was investigated. The difference of their conductance demonstrated the gating effect of cation-π interaction. Theoretical calculations showed...

To monitor and investigate chemical reaction in real-time and in situ is a long-standing and challenging goal in chemistry. Herein, an electric potential-promoted oxidative coupling reaction of organoboron compounds without the addition of base is reported, and the transmetallation process involved is monitored in real-time and in situ with STMBJ technique. We found the electric potential applied determined the transmetallation. At low bias voltage, the first-step transmetallation process occurred and afforded Au-C bonded aryl gold intermediates. The electronic properties of organoboron compounds have a strong influence on transmetallation process, and electron-rich compounds facilitate this transformation. At high bias voltage, the second-step transmetallation process took place, and the corresponding intermediate ( highly reactive diaryl metal complex) was detected with the assistant of Pd (OAc) 2 . Our work demonstrates the applications of STMBJ on in situ monitoring and catalyzing of chemical reactions, and provides a new methodology to fabricate singlemolecule devices.

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Here, we report the molecule - electrode interface of single-molecule junction can be regulated by side chain. Based on this regulation, a single-molecule junction probe, PyCHO, is developed, which can...