Synchronized Offset Stacking: A Concept for Growing Large-Domain and Highly Crystalline 2D Covalent Organic Frameworks
| Autor: | Fabian C. Hanusch, Simon Herbert, Derya Bessinger, Florian Auras, Timothy Clark, Laura Ascherl, Christina Hettstedt, Thomas Bein, Johannes T. Margraf, Paul Knochel, Stephan Reuter, Konstantin Karaghiosoff, Markus Döblinger, Amir Hossein Hakimioun |
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| Rok vydání: | 2016 |
| Předmět: |
Organic electronics
Chemistry Stacking Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Catalysis Article 0104 chemical sciences Crystallinity Delocalized electron Colloid and Surface Chemistry Molecular geometry Covalent bond Lattice (order) 0210 nano-technology Porous medium |
| Zdroj: | Journal of the American Chemical Society |
| ISSN: | 1520-5126 |
| Popis: | Covalent organic frameworks (COFs), formed by reversible condensation of rigid organic building blocks, are crystalline and porous materials of great potential for catalysis and organic electronics. Particularly with a view of organic electronics, achieving a maximum degree of crystallinity and large domain sizes while allowing for a tightly π-stacked topology would be highly desirable. We present a design concept that uses the 3D geometry of the building blocks to generate a lattice of uniquely defined docking sites for the attachment of consecutive layers, thus allowing us to achieve a greatly improved degree of order within a given average number of attachment and detachment cycles during COF growth. Synchronization of the molecular geometry across several hundred nanometers promotes the growth of highly crystalline frameworks with unprecedented domain sizes. Spectroscopic data indicate considerable delocalization of excitations along the π-stacked columns and the feasibility of donor–acceptor excitations across the imine bonds. The frameworks developed in this study can serve as a blueprint for the design of a broad range of tailor-made 2D COFs with extended π-conjugated building blocks for applications in photocatalysis and optoelectronics. |
| Databáze: | OpenAIRE |
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