Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 23: Poster Monday: Nanostructures 1

O 23.6: Poster

Monday, September 5, 2022, 18:00–20:00, P4

2D covalent organic frameworks from diboronic acids: the influence of the solvent — •Wenbo Lu, Ethan Malone, Mihaela Enache, and Meike Stöhr — Zernike Institute for Advanced Materials, University of Groningen, Netherlands

Over the past years, two-dimensional (2D) covalent organic frameworks (COFs) have gained substantial interest for their use in nanopatterning, organic electronics, and as a basis for nanoreactors or molecular sieves. In particular, 2D COFs formed by polycondensation of boronic acids on surfaces have already yielded promising results [1, 2].

In this study, 2D COFs were synthesized by 1,4-benzenediboronic acid (BDBA) polycondensation on highly oriented pyrolytic graphite (HOPG) which resulted in the formation of a long-range ordered hexagonal molecular network. For the formation of the 2D COFs, a drop of BDBA solution was deposited onto HOPG, then placed in an autoclave and annealed at certain temperature. The structure and coverage of the 2D COFs was studied by scanning tunneling microscopy and atomic force microscopy under ambient conditions. In order to obtain both high quality as well as extended COFs, the influence of four solvents on the COF formation was studied. Our results provide guidance for obtaining high quality 2D COFs formed by boronic acid derivatives.

[1] S. Spitzer et al., Chemical Communications 53 (2017) 5147.

[2] J. F. Dienstmaier et al., ACS Nano 6 (2012) 7234.