Ilana Stone, Lambert/Roy Groups
4:00pm - 5:00pm
Zoom Meeting: https://columbiauniversity.zoom.us/meeting/register/tJUpcOqgqjsqHtzFPQRRITjTql7EE1_dr5-q
The scanning tunneling microscopy break junction (STM-BJ) approach has recently emerged as the most promising technique to enable true single molecule reactions. By breaking and reforming molecular junctions, individual molecules can be analyzed, resulting in highly reproducible and precise conductance signatures. This transformative technique reifies the already revolutionary STM method by uniting the fundamental physical chemistry and theory with functional systems. In this talk, I will present a single-molecule method to study reaction chemistry in which reactions are driven by the local electrochemical potential at the nanostructured Au STM tip. These reactions are validated by comparing the molecular junction characteristics from the in situ reaction products to those of the expected products prepared ex situ. Specifically, I will focus on the Au-catalyzed oxidative coupling of a series of aniline derivatives to form azobenzenes. I will also discuss the formation of covalent Au–C contacts from aryl iodides via an in situ oxidative addition reaction and a subsequent Ullmann coupling to form oligophenyl wires. Critically, reactions are solution based and can be performed under ambient conditions, rendering the technique as both a more facile approach to single molecule experimentation and a closer facsimile of synthetic chemistry.
Friday, May 22, 2020 at 4:00pm-5:00pm EDT
Zoom Meeting: Register Here!
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