Publication date: 11th July 2022
In the recent years, the synthesis of atomically precise framework materials such as metal-organic frameworks and covalent organic frameworks has resulted in first examples where the particular sub-class of two-dimensional (2D) polymers have both structural perfection and long-range crystalline order. Crystallinity imposes that lattice order effect emerge where properties, intrinsic to the lattice, reflect in the electronic and vibrational properties of the materials.
I will highlight the importance of lattice effects on the chemical and physical properties of 2D polymers by starting from prototypical graphene towards materials with different underlying lattices, including honeycomb, square, kagome, and square-octagon lattices. Some of these lattices show correlated features such as flat bands and Dirac points, which result both in interesting physical phenomena, but are also opening the door for applications in catalysis. I will highlight the particular example of photocatalysis on honeycomb-kagome heterotriangulene 2D polymers and show how the interplay of molecular functionality and long-range order results in efficient metal-free non-toxic photocatalysts.
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