Wed, 24 Mar 2021
Events, Seminar Series
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Dr. Jean-François Morin

Université Laval

Bottom-Up Synthesis of Well-Defined Graphene Nanoribbons and Nanographenes : From Unprecedented Molecules to Electronic Materials

Wednesday, March 24, 2021
Zoom Webinar @ 1:30 p.m.

 

Webinar Link

Join us on Zoom: https://sfu.zoom.us/j/68803392479?pwd=ajMxSjJ1azg1cU1ma2E0TGNiOWx0QT09

Webinar ID: 688 0339 2479

Passcode: 505961

Abstract

Nanographenes (NGs) and graphene nanoribbons (GNRs) are very promising materials for electronic applications such as field-effect transistors, solar cells and biosensors. However, NGs and GNRs produced by physical methods suffer from poor solubility in common solvents, which make difficult their deposition on large substrates as required for the production of the next generation of electronic devices. Moreover, physical methods do not allow control over size, shape and functionalization of GNRs, leading to undefined electronic and physical properties. Methods to prepare such materials using the solution-phase bottom-up approach have been proposed. Yet, no synthetic method provides a clean aromatization step and the resulting materials can possess significant number of structural defects. In this presentation, we will show a new bottom-up synthetic strategy for the preparation of soluble, well-defined NGs and GNRs with controllable width and physical properties. Our strategy is based on the straightforward preparation of different chlorine-containing oligo- and polyphenylene precursors, followed by an intramolecular cyclodehydrochlorination (CDHC) reaction to form the graphenic structure. We will also present our efforts to improve intramolecular photochemical C-C cross-coupling reactions using new photolabile groups. The synthesis and characterization of several NGs and GNRs will be presented. Finally, our most recent results on NGs based on anthanthrone with a diradical character will be presented.