A Crystalline Three-Dimensional Covalent Organic Framework with Flexible Building Blocks

2021 ◽  
Vol 143 (4) ◽  
pp. 2123-2129
Author(s):  
Xiaoling Liu ◽  
Jian Li ◽  
Bo Gui ◽  
Guiqing Lin ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Building Blocks ◽  
Covalent Organic Framework ◽  
Organic Framework

A Three-Dimensional Tetraphenylethylene-Based Fluorescence Covalent Organic Framework for Molecular Recognition

2020 ◽  
Author(s):  
Junxia Ren ◽  
Yaozu Liu ◽  
Xin Zhu ◽  
Yangyang Pan ◽  
Yujie Wang ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Fluorescence Probe ◽  
Three Dimensional ◽  
Hazardous Substances ◽  
Covalent Organic Framework ◽  
Highly Sensitive ◽  
Volatile Organic ◽  
Polycyclic Aromatic ◽  
Better Than ◽  
Organic Framework

<p><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a>The development of highly-sensitive recognition of </a><a></a><a></a><a></a><a></a><a>hazardous </a>chemicals, such as volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs), is of significant importance because of their widespread social concerns related to environment and human health. Here, we report a three-dimensional (3D) covalent organic framework (COF, termed JUC-555) bearing tetraphenylethylene (TPE) side chains as an aggregation-induced emission (AIE) fluorescence probe for sensitive molecular recognition.<a></a><a> </a>Due to the rotational restriction of TPE rotors in highly interpenetrated framework after inclusion of dimethylformamide (DMF), JUC-555 shows impressive AIE-based strong fluorescence. Meanwhile, owing to the large pore size (11.4 Å) and suitable intermolecular distance of aligned TPE (7.2 Å) in JUC-555, the obtained material demonstrates an excellent performance in the molecular recognition of hazardous chemicals, e.g., nitroaromatic explosives, PAHs, and even thiophene compounds, via a fluorescent quenching mechanism. The quenching constant (<i>K</i><sub>SV</sub>) is two orders of magnitude better than those of other fluorescence-based porous materials reported to date. This research thus opens 3D functionalized COFs as a promising identification tool for environmentally hazardous substances.</p>

Highly efficient CO2 capture by mixed matrix membranes containing three-dimensional covalent organic framework fillers

2019 ◽  
Vol 7 (9) ◽  
pp. 4549-4560 ◽  
Author(s):  
Youdong Cheng ◽  
Linzhi Zhai ◽  
Yunpan Ying ◽  
Yuxiang Wang ◽  
Guoliang Liu ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Three Dimensional ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Covalent Organic Framework ◽  
Highly Efficient ◽  
Organic Framework ◽  
Matrix Membranes

A three-dimensional covalent organic framework filler with size-selective pores has been proven effective in boosting the membrane CO2 capture performance.

scholarly journals Self-standing and flexible covalent organic framework (COF) membranes for molecular separation

2020 ◽  
Vol 6 (41) ◽  
pp. eabb1110
Author(s):  
Jiangtao Liu ◽  
Gang Han ◽  
Dieling Zhao ◽  
Kangjia Lu ◽  
Jie Gao ◽  
...  
Keyword(s):  
Building Blocks ◽  
Shape Selectivity ◽  
Honeycomb Lattice ◽  
Free Standing ◽  
Covalent Bonds ◽  
Separation Science ◽  
Covalent Organic Framework ◽  
Molecular Building Blocks ◽  
Almost All ◽  
Organic Framework

Almost all covalent organic framework (COF) materials conventionally fabricated by solvothermal method at high temperatures and pressures are insoluble and unprocessable powders, which severely hinder their widespread applications. This work develops an effective and facile strategy to construct flexible and free-standing pure COF membranes via the liquid-liquid interface-confined reaction at room temperature and atmospheric pressure. The aperture size and channel chemistry of COF membranes can be rationally designed by bridging various molecular building blocks via strong covalent bonds. Benefiting from the highly-ordered honeycomb lattice, high solvent permeances are successfully obtained and follow the trend of acetonitrile > acetone > methanol > ethanol > isopropanol. Interestingly, the imine-linked COF membrane shows higher nonpolar solvent permeances than b-ketoenamine-linked COF due to their difference in pore polarity. Both kinds of COF membranes exhibit high solvent permeances, precise molecular sieving, excellent shape selectivity, and sufficient flexibility for membrane-based separation science and technology.

scholarly journals 3D Cage COFs: A Dynamic Three-Dimensional Covalent Organic Framework with High-Connectivity Organic Cage Nodes

2020 ◽  
Vol 142 (39) ◽  
pp. 16842-16848 ◽  
Author(s):  
Qiang Zhu ◽  
Xue Wang ◽  
Rob Clowes ◽  
Peng Cui ◽  
Linjiang Chen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Covalent Organic Framework ◽  
High Connectivity ◽  
Organic Framework

Synthesis, Structure, and Properties of a Chiral Zinc(II) Metal-Organic Framework Featuring Linear Trinuclear Secondary Building Blocks

2012 ◽  
Vol 65 (12) ◽  
pp. 1662 ◽  
Author(s):  
Zilu Chen ◽  
Chuanbing Zhang ◽  
Xianlin Liu ◽  
Zhong Zhang ◽  
Fupei Liang
Keyword(s):  
Building Block ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Building Blocks ◽  
Triangular Prism ◽  
Structure And Properties ◽  
Adsorption Selectivity ◽  
One Dimensional ◽  
Metal Organic ◽  
Organic Framework

A chiral metal-organic framework formulated as [Zn3(L-TMTA)2(4,4′-bpy)4]·24H2O (1) was prepared from the reaction of Zn(NO3)2·6H2O with trimesoyltri(L-alanine) (L-TMTAH3) in the presence of 4,4′-bipyridine (4,4′-bpy). Compound 1 features linear trinuclear secondary building blocks [Zn3(syn-syn-COO)2(μ2,η3-COO)2]2+. Each linear trinuclear secondary building block is further linked to another eight ones around it by four L-TMTA3– ligands and eight 4,4′-bpy ligands, leading to the construction of a uninodal three-dimensional framework with triangular prism-like one-dimensional channels. Dehydrated compound 1 displays remarkable adsorption selectivity on CO2 and water vapour over N2 gas.

A novel crystalline azine-linked three-dimensional covalent organic framework for CO2 capture and conversion

2019 ◽  
Vol 55 (83) ◽  
pp. 12459-12462 ◽  
Author(s):  
Pengxin Guan ◽  
Jikuan Qiu ◽  
Yuling Zhao ◽  
Huiyong Wang ◽  
Zhiyong Li ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Three Dimensional ◽  
Excellent Performance ◽  
Covalent Organic Framework ◽  
Organic Framework

A novel crystalline azine-linked three-dimensional covalent organic framework was rationally synthesized and exhibited excellent performance in CO2 adsorption and conversion.

An Adeninate-Based Metal–Organic Framework for Antitumour Drug Delivery and Anti-Osteogenic Sarcoma Activity Evolution

2018 ◽  
Vol 71 (12) ◽  
pp. 978
Author(s):  
Bing Yan ◽  
Huanqiu Li ◽  
Wenyan Jiang ◽  
Long Mu
Keyword(s):  
Drug Delivery ◽  
Ph Value ◽  
Antitumour Activity ◽  
Metal Organic Framework ◽  
Osteogenic Sarcoma ◽  
Three Dimensional ◽  
Building Blocks ◽  
Therapy Effect ◽  
Metal Organic ◽  
Organic Framework

Targeted anticancer drug delivery systems (DDSs) have been considered as one of the most important approaches for reducing the side effects and enhancing the therapy effect in cancer treatment. This work presents a targeted anticancer DDS on the basis of a newly synthesised adeninate-based metal–organic framework (MOF) [Zn2(ad)2(AMDB)(H2O)](DMF)3 (1) with biomolecular adenine (HAd), zinc(ii) ions, and 4,4′-(aminomethylene)dibenzoic acid (H2AMDB) as the molecular building blocks. The structural analysis via X-ray diffraction technology shows MOF 1 is a channel-type three-dimensional network composed of rod-like Zn–Ad chains. Due to its large inner free spaces and uncoordinated N donor sites functionalised pore surroundings, the antitumour molecule 5-fluorouracil (5-Fu) could be loaded into the pores of 1a (activated 1) though an adsorption process, which shows a moderate high storage capacity of 32 wt-%. At the same time, the pH-dependent delivery of 5-Fu could be achieved in phosphate-buffered saline (PBS) solution. With a lower pH value, the drug release will be enhanced. Furthermore, the invitro antitumour activity of the drug/1a composite has been probed via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay on two human osteogenic sarcoma cells (MG63 and U2OS).

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