A pre-synthetic strategy to construct single ion conductive covalent organic frameworks

2020 ◽  
Vol 56 (18) ◽  
pp. 2747-2750 ◽  
Author(s):  
Juan Li ◽  
Fu-Qiang Zhang ◽  
Falian Li ◽  
Zhenzhen Wu ◽  
Canliang Ma ◽  
...  
Keyword(s):  
Covalent Organic Frameworks ◽  
Atom Economy ◽  
Synthetic Strategy ◽  
Structure Detection ◽  
Sulfonate Salts

A pre-synthetic strategy was proposed to prepare single-ion conductive COFs by using 2,5-diaminobenzene sulfonate salts as the monomers. This strategy is advanced in terms of atom economy and easy to operate in structure detection and preparation.

CuI-Catalyzed [3+2] Cycloaddition of Hindered Vinylidenebisphosphonates (VBP) with Azomethine Imines for Highly Regioselective Access to Dinitrogen-Heterobicycle-Containing Bisphosphonates

Synthesis ◽  
2018 ◽  
Vol 50 (13) ◽  
pp. 2601-2607
Author(s):  
Zhongxiang Zhu ◽  
Qinghe Wang ◽  
Dulin Kong ◽  
Tiao Huang ◽  
Mingshu Wu
Keyword(s):  
Biological Activity ◽  
Low Cost ◽  
Cycloaddition Reaction ◽  
Dipolar Cycloaddition ◽  
Atom Economy ◽  
Mild Conditions ◽  
Synthetic Strategy ◽  
Fused Heterocycles ◽  
Azomethine Imines ◽  
High Stereoselectivity

A concise, atom-economic, and highly regioselective synthetic strategy for the construction of several dinitrogen-fused heterocycles bearing bisphosphonates by 1,3-dipolar cycloaddition reaction of azomethine imines with tetraethyl vinylidene-1,1-bisphosphonate in the presence of CuI in toluene media has been developed. The targeted compounds were obtained in good yields and with excellent regioselectivity. This method for the synthesis of gem-bisphosphonates (BPs) is particularly attractive due to features such as low cost, mild conditions, atom economy, high stereoselectivity, and potential biological activity of the product.

Intrinsic proton conduction in 2D sulfonated covalent organic framework through the post-synthetic strategy

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yuwei Zhang ◽  
Chunzhi Li ◽  
Zhaohan Liu ◽  
Yuze Yao ◽  
Md. Mahmudul Hasan ◽  
...  
Keyword(s):  
Proton Conduction ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Covalent Organic Framework ◽  
Synthetic Strategy ◽  
Organic Framework

Two-dimensional covalent organic frameworks (2D COFs) have attracted much attentions in proton conduction, owing to their regular pore channels and easy functionalization. However, most of COFs required the loading of...

scholarly journals The Macroscopic Covalent Organic Framework Architectures for Water Remediation

2021 ◽  
Author(s):  
Abdul Khayum Mohammed ◽  
Dinesh Shetty
Keyword(s):  
Organic Molecules ◽  
Three Dimensional ◽  
Water Remediation ◽  
Porous Polymers ◽  
Covalent Organic Frameworks ◽  
Dynamic Covalent Chemistry ◽  
Covalent Organic Framework ◽  
Synthetic Strategy ◽  
Organic Framework

Covalent organic frameworks (COFs) are two- (2D) or three-dimensional (3D) crystalline and porous polymers constructed from organic molecules with various symmetries. The reticular synthetic strategy and the dynamic covalent chemistry...

scholarly journals Synthesis of Two-Dimensional C–C Bonded Truxene-Based Covalent Organic Frameworks by Irreversible Brønsted Acid-Catalyzed Aldol Cyclotrimerization

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Qingsong Zhang ◽  
Yunlong Sun ◽  
Haijing Li ◽  
Kun Tang ◽  
Yu-Wu Zhong ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Synthetic Strategy ◽  
X Ray Scattering ◽  
Benzyl Methylene ◽  
Brönsted Acid ◽  
Acid Catalyzed

The synthesis of new C–C bonded two-dimensional (2D) covalent organic frameworks (COFs) is highly desirable. Here, a simple but effective synthetic strategy has been developed using an irreversible Brønsted acid-catalyzed aldol cyclotrimerization reaction by virtue of truxene as a linkage. Nonolefin C–C bonded 2D truxene-based covalent organic frameworks (Tru-COFs) were constructed by polymerization of 1,3,5-triindanonebenzene (TDB). The structure formation was confirmed by wide-angle X-ray scattering, Fourier-transform infrared spectroscopy, and solid-state 13C CP/MAS NMR. The results showed that the Tru-COFs were porous (645 m2/g) and chemically stable. Benzyl methylene in conjugated Tru-COFs more effectively produced photoinduced radicals than the model truxene compound. Due to the radical photoresponsiveness, Tru-COFs were efficient catalysts for photocatalytic oxidation of sulfides. We expect that this will provide a new synthetic methodology to obtain C–C bonded functional 2D COFs.

O-Vinylphosphonylated Salicylaldehydes as Aldo-Vinyl Bifunctional Building Blocks for anti-3,4-Disubstituted Phosphadihydrocoumarins

Synthesis ◽  
2019 ◽  
Vol 51 (15) ◽  
pp. 2923-2935
Author(s):  
Qinghe Wang ◽  
Dulin Kong ◽  
Tiao Huang ◽  
Mingshu Wu
Keyword(s):  
Building Block ◽  
Building Blocks ◽  
Atom Economy ◽  
Catalyst Free ◽  
Synthetic Strategy

An efficient synthetic strategy for anti-3,4-disubstituted phosphadihydrocoumarin compounds has been established by tandem aza-Michael–aldol-like annulations of tetrahydroisoquinolines with O-vinylphosphonylated salicylaldehydes as an aldo-vinyl bifunctional building block. This conversion was characterized by ‘green’ properties such as a step- and atom-economy, catalyst-free conditions, highly anti-selectivity­, and readily available starting materials.

A facile solution-phase synthetic approach for constructing phenol-based porous organic cages and covalent organic frameworks

2020 ◽  
Vol 22 (8) ◽  
pp. 2498-2504 ◽  
Author(s):  
Lei Zhang ◽  
Rongran Liang ◽  
Cheng Hang ◽  
Haiying Wang ◽  
Lin Sun ◽  
...  
Keyword(s):  
General Solution ◽  
Organic Solvent ◽  
Solution Phase ◽  
Synthetic Approach ◽  
Covalent Organic Frameworks ◽  
Water Solutions ◽  
Solvent Water ◽  
Synthetic Strategy

A general solution-phase synthetic strategy is developed to construct both porous organic cages (POCs) and covalent organic frameworks (COFs) by simply stirring and heating organic solvent/water solutions of aldehydes and amines in the presence of MOH (M = Na, K, and Cs).

Immobilization of ionic liquids to covalent organic frameworks for catalyzing the formylation of amines with CO2 and phenylsilane

2016 ◽  
Vol 52 (44) ◽  
pp. 7082-7085 ◽  
Author(s):  
Bin Dong ◽  
Liangying Wang ◽  
Shang Zhao ◽  
Rile Ge ◽  
Xuedan Song ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Covalent Organic Frameworks ◽  
Synthetic Strategy

We presented the immobilization of ionic liquids on the channel walls of COFs using a post-synthetic strategy.

Covalent organic frameworks: an ideal platform for designing ordered materials and advanced applications

2021 ◽  
Author(s):  
Ruoyang Liu ◽  
Ke Tian Tan ◽  
Yifan Gong ◽  
Yongzhi Chen ◽  
Zhuoer Li ◽  
...  
Keyword(s):  
Covalent Organic Frameworks ◽  
2D And 3D ◽  
Advanced Applications

Covalent organic frameworks offer a molecular platform for integrating organic units into periodically ordered yet extended 2D and 3D polymers to create topologically well-defined polygonal lattices and built-in discrete micropores and/or mesopores.

Insulating Composites Made from Sulfur, Canola Oil, and Wool

2020 ◽  
Author(s):  
Israa Bu Najmah ◽  
Nicholas Lundquist ◽  
Melissa K. Stanfield ◽  
Filip Stojcevski ◽  
Jonathan A. Campbell ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Canola Oil ◽  
Building Blocks ◽  
Atom Economy ◽  
Flame Resistance ◽  
Sustainable Building ◽  
Second Stage ◽  
Wool Fibers ◽  
Insulating Properties ◽  
Polysulfide Polymer

An insulating composite was made from the sustainable building blocks wool, sulfur, and canola oil. In the first stage of the synthesis, inverse vulcanization was used to make a polysulfide polymer from the canola oil triglyceride and sulfur. This polymerization benefits from complete atom economy. In the second stage, the powdered polymer is mixed with wool, coating the fibers through electrostatic attraction. The polymer and wool mixture is then compressed with mild heating to provoke S-S metathesis in the polymer, which locks the wool in the polymer matrix. The wool fibers impart tensile strength, insulating properties, and flame resistance to the composite. All building blocks are sustainable or derived from waste and the composite is a promising lead on next-generation insulation for energy conservation.

Intercalation of First Row Transition Metals inside Covalent-Organic Frameworks (COF): a Strategy to Fine Tune the Electronic Properties of Porous Crystalline Materials

2018 ◽  
Author(s):  
Srimanta Pakhira ◽  
Jose Mendoza-Cortes
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Electronic Properties ◽  
High Surface ◽  
Electronic Devices ◽  
High Surface Area ◽  
Main Role ◽  
Covalent Organic Frameworks ◽  
Porous Network ◽  
Crystalline Materials

<div>Covalent organic frameworks (COFs) have emerged as an important class of nano-porous crystalline materials with many potential applications. They are intriguing platforms for the design of porous skeletons with special functionality at the molecular level. However, despite their extraordinary properties, it is difficult to control their electronic properties, thus hindering the potential implementation in electronic devices. A new form of nanoporous material, COFs intercalated with first row transition metal is proposed to address this fundamental drawback - the lack of electronic tunability. Using first-principles calculations, we have designed 31 new COF materials <i>in-silico</i> by intercalating all of the first row transition metals (TMs) with boroxine-linked and triazine-linked COFs: COF-TM-x (where TM=Sc-Zn and x=3-5). This is a significant addition considering that only 187 experimentally COFs structures has been reported and characterized so far. We have investigated their structure and electronic properties. Specifically, we predict that COF's band gap and density of states (DOSs) can be controlled by intercalating first row transition metal atoms (TM: Sc - Zn) and fine tuned by the concentration of TMs. We also found that the $d$-subshell electron density of the TMs plays the main role in determining the electronic properties of the COFs. Thus intercalated-COFs provide a new strategy to control the electronic properties of materials within a porous network. This work opens up new avenues for the design of TM-intercalated materials with promising future applications in nanoporous electronic devices, where a high surface area coupled with fine-tuned electronic properties are desired.</div>

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