Twist Building Blocks from Planar to Tetrahedral for the Synthesis of Covalent Organic Frameworks

2020 ◽  
Vol 142 (8) ◽  
pp. 3718-3723 ◽  
Author(s):  
Chao Gao ◽  
Jian Li ◽  
Sheng Yin ◽  
Junliang Sun ◽  
Cheng Wang
Keyword(s):  
Building Blocks ◽  
Covalent Organic Frameworks

Dibenzochrysene Enables Tightly Controlled Docking and Stabilizes Photoexcited States in Dual-Pore Covalent Organic Frameworks

2019 ◽  
Author(s):  
Torben Sick ◽  
Niklas Keller ◽  
Nicolai Bach ◽  
Andreas Koszalkowski ◽  
Julian Rotter ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Photophysical Properties ◽  
Visible Spectrum ◽  
Large Family ◽  
Building Blocks ◽  
Band Gaps ◽  
Docking Site ◽  
Covalent Organic Frameworks ◽  
Connected Node ◽  
Optoelectronic Applications

Covalent organic frameworks (COFs), consisting of covalently connected organic building units, combine attractive features such as crystallinity, open porosity and widely tunable physical properties. For optoelectronic applications, the incorporation of heteroatoms into a 2D COF has the potential to yield desired photophysical properties such as lower band gaps, but can also cause lateral offsets of adjacent layers. Here, we introduce dibenzo[g,p]chrysene (DBC) as a novel building block for the synthesis of highly crystalline and porous 2D dual-pore COFs showing interesting properties for optoelectronic applications. The newly synthesized terephthalaldehyde (TA), biphenyl (Biph), and thienothiophene (TT) DBC-COFs combine conjugation in the a,b-plane with a tight packing of adjacent layers guided through the molecular DBC node serving a specific docking site for successive layers. The resulting DBC-COFs exhibit a hexagonal dual-pore kagome geometry, which is comparable to COFs containing another molecular docking site, namely 4,4′,4″,4‴-(ethylene-1,1,2,2-tetrayl)-tetraaniline (ETTA). In this context, the respective interlayer distances decrease from about 4.60 Å in ETTA-COFs to about 3.6 Å in DBC-COFs, leading to well-defined hexagonally faceted single crystals sized about 50-100 nm. The TT DBC-COFs feature broad light absorption covering large parts of the visible spectrum, while Biph DBC-COF shows extraordinary excited state lifetimes exceeding 10 ns. In combination with the large number of recently developed linear conjugated building blocks, the new DBC tetra-connected node is expected to enable the synthesis of a large family of strongly p-stacked, highly ordered 2D COFs with promising optoelectronic properties.

A design strategy for the construction of 2D heteropore covalent organic frameworks based on the combination of C2v and D3h symmetric building blocks

2018 ◽  
Vol 9 (3) ◽  
pp. 279-283 ◽  
Author(s):  
Cheng Qian ◽  
En-Cheng Liu ◽  
Qiao-Yan Qi ◽  
Kaijia Xu ◽  
Guo-Fang Jiang ◽  
...  
Keyword(s):  
Building Blocks ◽  
Design Strategy ◽  
Covalent Organic Frameworks

A strategy to construct heteropore covalent organic frameworks has been developed based on a desymmetrization design which takes advantage of the combination of C2v and D3h symmetries.

Three-dimensional porphyrin-based covalent organic frameworks with tetrahedral building blocks for single-site catalysis

2019 ◽  
Vol 43 (43) ◽  
pp. 16907-16914 ◽  
Author(s):  
Yong Liu ◽  
Xiaodong Yan ◽  
Tao Li ◽  
Wen-Da Zhang ◽  
Qiu-Ting Fu ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Three Dimensional ◽  
Building Blocks ◽  
Single Site ◽  
Covalent Organic Frameworks ◽  
Excellent Performance ◽  
Biomimetic Catalysis ◽  
Single Site Catalysts

Two 3D porphyrin-based covalent organic frameworks were synthesized as single-site catalysts and exhibited excellent performance in biomimetic catalysis and oxygen evolution reactions.

scholarly journals Chiral covalent organic frameworks: design, synthesis and property

2020 ◽  
Author(s):  
X Han ◽  
C Yuan ◽  
B Hou ◽  
Lujia Liu ◽  
H Li ◽  
...  
Keyword(s):  
Porous Materials ◽  
Asymmetric Catalysis ◽  
Chiral Recognition ◽  
Building Blocks ◽  
Enantioselective Separation ◽  
Structural Studies ◽  
Covalent Organic Frameworks ◽  
Covalent Bonds ◽  
Design Synthesis ◽  
Potential Applications

Covalent organic frameworks (COFs) are constructed using reticular chemistry with the building blocks being connected via covalent bonds and have emerged as a new series of porous materials for multitudinous applications. Most COFs reported to date are achiral, and only a small fraction of COFs with chiral nature are reported. This review covers the recent advances in the field of chiral COFs (CCOFs), including their design principles and synthetic strategies, structural studies, and potential applications in asymmetric catalysis, enantioselective separation, and chiral recognition. Finally, we illustrate the remaining challenges and future opportunities in this field.

scholarly journals Chiral covalent organic frameworks: design, synthesis and property

2020 ◽  
Author(s):  
X Han ◽  
C Yuan ◽  
B Hou ◽  
Lujia Liu ◽  
H Li ◽  
...  
Keyword(s):  
Porous Materials ◽  
Asymmetric Catalysis ◽  
Chiral Recognition ◽  
Building Blocks ◽  
Enantioselective Separation ◽  
Structural Studies ◽  
Covalent Organic Frameworks ◽  
Covalent Bonds ◽  
Design Synthesis ◽  
Potential Applications

Covalent organic frameworks (COFs) are constructed using reticular chemistry with the building blocks being connected via covalent bonds and have emerged as a new series of porous materials for multitudinous applications. Most COFs reported to date are achiral, and only a small fraction of COFs with chiral nature are reported. This review covers the recent advances in the field of chiral COFs (CCOFs), including their design principles and synthetic strategies, structural studies, and potential applications in asymmetric catalysis, enantioselective separation, and chiral recognition. Finally, we illustrate the remaining challenges and future opportunities in this field.

A supramolecular strategy based on molecular dipole moments for high-quality covalent organic frameworks

2016 ◽  
Vol 52 (51) ◽  
pp. 7986-7989 ◽  
Author(s):  
Laura M. Salonen ◽  
Dana D. Medina ◽  
Enrique Carbó-Argibay ◽  
Maarten G. Goesten ◽  
Luís Mafra ◽  
...  
Keyword(s):  
Surface Area ◽  
Intermolecular Interactions ◽  
Dipole Moments ◽  
Building Blocks ◽  
Large Surface Area ◽  
Covalent Organic Frameworks ◽  
High Quality ◽  
Molecular Dipole ◽  
High Crystallinity ◽  
Strong Dipole

Attractive intermolecular interactions of building blocks with strong dipole moments result in a COF with high crystallinity and large surface area.

Fabrication of bilayer tetrathiafulvalene integrated surface covalent organic frameworks

2016 ◽  
Vol 18 (26) ◽  
pp. 17356-17359 ◽  
Author(s):  
Wei-Long Dong ◽  
Shu-Ying Li ◽  
Jie-Yu Yue ◽  
Cheng Wang ◽  
Dong Wang ◽  
...  
Keyword(s):  
Building Blocks ◽  
Covalent Organic Frameworks ◽  
Covalent Organic Framework ◽  
Organic Framework

A bilayer covalent organic framework (COF) of TTF-based building blocks was obtained by imine reaction between tetrathiafulvalene tetraaldehyde (4ATTF) andp-phenylenediamine (PPDA).

Two-dimensional dual-pore covalent organic frameworks obtained from the combination of two D2h symmetrical building blocks

2016 ◽  
Vol 52 (78) ◽  
pp. 11704-11707 ◽  
Author(s):  
Yuan Tian ◽  
Shun-Qi Xu ◽  
Cheng Qian ◽  
Zhong-Fu Pang ◽  
Guo-Fang Jiang ◽  
...  
Keyword(s):  
Building Blocks ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Adsorption Capacities

A strategy to construct covalent organic frameworks (COFs) bearing two different kinds of pores has been developed. The as-prepared dual-pore COFs exhibit good adsorption capacities for CO2 and H2.

scholarly journals Optoelectronic processes in covalent organic frameworks

2021 ◽  
Author(s):  
Niklas Keller ◽  
Thomas Bein
Keyword(s):  
Electron Transfer ◽  
Porous Materials ◽  
Building Blocks ◽  
Covalent Organic Frameworks ◽  
Molecular Building Blocks ◽  
Donor Acceptor

Covalent organic frameworks (COFs) are crystalline porous materials constructed from molecular building blocks using diverse linkage chemistries. The image illustrates electron transfer in a COF-based donor–acceptor system. Image by Nanosystems Initiative Munich.

Effects of connecting sequences of building blocks on reticular synthesis of covalent organic frameworks

Nano Research ◽  
2020 ◽  
Vol 14 (2) ◽  
pp. 381-386 ◽  
Author(s):  
De-Li Ma ◽  
Cheng Qian ◽  
Qiao-Yan Qi ◽  
Zhong-Ri Zhong ◽  
Guo-Fang Jiang ◽  
...  
Keyword(s):  
Building Blocks ◽  
Covalent Organic Frameworks
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