Reticular Synthesis of One‐Dimensional Covalent Organic Frameworks with 4‐c sql Topology for Enhanced Fluorescence Emission

Abstract

Covalent organic frameworks (COFs) have been extensively investigated due to their unique structure, porosity, and functionality. However, at the topological level, COFs remain as two‐dimensional (2D) or three‐dimensional (3D) structures, while COFs with one‐dimensional (1D) topology have not been systematically explored. In this work, we proposed a synthetic strategy for the construction of 1D‐COFs based on non‐linear edges and suitable high‐symmetry vertices. Compared with their 2D‐COFs counterparts, the 1D‐COFs with AIEgens located at the vertex of the frame exhibited enhanced fluorescence. The density functional theory (DFT) calculations revealed that the dimensional‐induced rotation restriction (DIRR) effect could spontaneously introduce additional non‐covalent interactions between the strip frames, which could substantially diminish non‐radiative transitions. This work also provides protocols for the design of 1D‐COFs and a guidance scheme for the synthesis of emitting COFs.

One‐Dimensional Covalent Organic Frameworks for the 2e− Oxygen Reduction Reaction

“…More recently, Chen et al. demonstrated that 1D COFs based on nonlinear edges show enhanced fluorescence [6c] . Nevertheless, 1D COFs are still rare, and developing more 1D COFs to extend the family of COFs has been underexplored.…”

A BODIPY‐Based 1D Covalent Organic Framework for Photocatalytic Aerobic Oxidation

“…[24] Up to now, 1D COFs still very rare and only few examples are reported. [25][26][27][28] Boron-dipyrromethene (BODIPY) dyes are one of the most versatile fluorophores with excellent visible-light absorption ability, thermal and photochemical stabilities, high fluorescence quantum yields, and chemical robustness. [29,30] These photophysical and chemical properties of BODIPY attracted tremendous attentions and they can be widely used in photocatalysis, bioimaging, sensing and luminescent devices.…”

“…Due to the extremely high anisotropy and the entropy‐driven random packing of organic chains, the synthesis of 1D COFs are filled with huge challenge [24] . Up to now, 1D COFs still very rare and only few examples are reported [25–28] …”

Viologen linker as a strong electron-transfer mediator in the covalent organic framework to enhance electrocatalytic CO2reduction

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] To date, many Au-, Ag-, and Cu-based nanostructured materials, metal-organic frameworks, and single-atom catalysts have been developed to apply in the CO 2 electroreduction reaction (CO 2 RR). [16][17][18][19][20][21][22] However, the CO 2 RR generally faces challenges in achieving high selectivity and a high current density due to the intrinsic thermodynamic stability of CO 2 and the competitive hydrogen evolution reaction (HER), hindering its practical application. Therefore, the development of highly efficient electrode materials that can overcome these problems is desirable.…”