Covalent organic frameworks from a monomer with reduced symmetry: polymorphism and Sierpiński triangles

Daling Cui (1) , Yuan Fang (2) , Oliver Maclean (1) , Dmitrii F. Perepichka (2) , Federico Rosei (1) , Sylvain Clair (3, 1)

1 EMT-INRS - Énergie Matériaux Télécommunications - INRS
2 McGill University = Université McGill [Montréal, Canada]
3 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

We report on the synthesis of a covalent organic framework based on the low-symmetry 1,3-benzenediboronic acid precursor. Two distinct polymorphs are obtained, a honeycomb network and Sierpiński triangles, as elucidated by scanning tunneling microscopy. Control over polymorph formation was achieved by varying the precursor concentration for on-surface synthesis.

Domains: Physics [physics]; Condensed Matter [cond-mat]; Materials Science [cond-mat.mtrl-sci]; Chemical Sciences; Material chemistry

Daling Cui, Yuan Fang, Oliver Maclean, Dmitrii F. Perepichka, Federico Rosei, et al.. Covalent organic frameworks from a monomer with reduced symmetry: polymorphism and Sierpiński triangles. Chemical Communications, 2019, 90, pp.13586-13589. ⟨10.1039/C9CC05674B⟩. ⟨hal-02355234⟩