Facile stabilization of a cyclodextrin metal–organic framework under humid environment <i>via</i> hydrogen sulfide treatment

Ke, Duo; Feng, Junfeng; Wu, Di; Hou, Junbo; Zhang, Xiaoqin; Li, Bang‐Jing; Zhang, Sheng

doi:10.1039/c9ra03079d

Cited by 41 publications

(24 citation statements)

References 44 publications

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“…The preparation method was adjusted according to the method previously reported by our research group 18,27 . In detail, γ‐CD (648 mg, 0.5 mmol) and KOH (224 mg, 4 mmol) were dissolved into 15 ml of pure water, and then 5 ml of CH 3 OH was added to obtain a turbid liquid.…”

Section: Methodsmentioning

confidence: 99%

Hierarchical porous carbon derived from green cyclodextrin metal‐organic framework and its application in microwave absorption

Zhang

Chen

et al. 2021

J of Applied Polymer Sci

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γ‐cyclodextrin (CD)‐metal‐organic framework (MOF)‐K is developed as a new kind of green template for the preparation of hierarchical porous carbon (HPC). Three‐level porous structure (micro‐, meso‐, and macro‐pores) has been successful constructed by calcined γ‐CD‐MOF‐K at 600°C. The fabricated carbon (HPC‐600) shows good microwave adsorption ability due to its unique hierarchical porous structure (macropores allow microwave enter the interior of the absorbents, and then micro‐ and meso‐pores attenuate the incident microwave effectively by multiple reflections and polarization loss caused.) The minimum reflection loss (RL) is − 23.5 dB and the effective absorption bandwidth (EAB, RL≤− 10 dB) is 4.3 GHz. This work provides a good reference for efficient and environment‐friendly microwave absorbents. In addition, the applications of HPC‐600 may further expand to adsorption, sensing and supercapacitors due to the hierarchically porous structure.

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Section: Methodsmentioning

confidence: 99%

Hierarchical porous carbon derived from green cyclodextrin metal‐organic framework and its application in microwave absorption

Zhang

Chen

et al. 2021

J of Applied Polymer Sci

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“…The stability of CD-MOFs in water has been improved through chemical modification to enhance their drug-loading and -release capabilities. ,,− Smaller CD-MOF crystals have been produced by a modified vapor diffusion method. Homogeneous and monodisperse crystals of nano- and micrometer-sized γ-CD-MOFs have been prepared by introducing cetyltrimethylammonium bromide (CTAB) and MeOH into an aqueous solution of γ-CD and KOH.…”

Section: Modifications Of Cd-mofsmentioning

confidence: 99%

“…Using a bottom-up approach, epoxy groups, derived from ethylene glycol diglycidyl ether, have been used 34 to cross-link the adjacent hydroxyl groups on the γ-CD tori inside the CD-MOF pores, followed by loss of some coordinating K + ions, to form well-defined nano-and microsized cubic gel particles. These chemical modifications have improved the stability of CD-MOFs in water, along with other approaches, such as the (i) incorporation 48 of hydrophobic C 60 molecules into CD-MOF matrices, (ii) surface modification 49 with cholesterol, and (iii) postsynthetic treatment 50 with H 2 S. 3,4-Ethylenedioxythiophene has also been adsorbed and polymerized 51 inside the hydrophilic nanochannels of a CD-MOF in order to reduce its water solubility and also render it thermally stable.…”

Section: Modifications Of Cd-mofsmentioning

confidence: 99%

Cyclodextrin Metal–Organic Frameworks and Their Applications

2021

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Metrics & MoreArticle Recommendations CONSPECTUS: Cyclodextrin-based metal−organic frameworks (CD-MOFs), derived from γ-cyclodextrin (γ-CD) and alkali metal cations, constitute a class of porous, renewable, and edible MOFs that can be synthesized from a naturally occurring carbohydrate on a large scale. γ-CD is a C 8 -symmetrical cyclic oligosaccharide composed of eight asymmetric α-1,4-linked D-glucopyranosyl residues that possesses a bucket-shaped cavity with an inner diameter of ∼1 nm and a depth of ∼0.8 nm. Upon combination of 1 equiv of γ-CD with 8 equiv of potassium hydroxide in an aqueous solution, followed by vapor diffusion of MeOH (or EtOH) into this solution during several days, CD-MOF-1 is obtained as cubic crystals. This carbohydrate-based MOF, which was discovered serendipitously in 2010, was the first highly crystalline CD-MOF to be obtained. X-ray crystallography of a single crystal reveals that it adopts the space group I432 with unit cell dimensions of approximately 31 × 31 × 31 Å 3 . Other CD-MOFs, namely, CD-MOF-2 and CD-MOF-3, can be obtained when potassium ions are replaced by rubidium and cesium ions, respectively. CD-MOFs comprise extended body-centered frameworks of (γ-CD) 6 cubic units, which contain spherical pores that reside at the center of the cubes, interconnected by alkali metal cations, forming both cylindrical and triangular channels.During the past decade, CD-MOFs have emerged as a useful class of multifunctional materials based on porous frameworks with extended structures displaying robust crystallinity, permanent porosity, and excellent biocompatibility. The family of CD-MOFs has been joined by a growing collection of metal nodes involving alkali metal cations (Li + , Na + , K + , Rb + , Cs + ) and γ-CD as well as its derivatives. As a result of the ability of their extended porous frameworks to absorb guest molecules, including gases, drugs, metalbased nanoclusters, and nanoparticles, CD-MOFs have potential applications in areas as disparate as templating syntheses of metalbased nanoparticles and gels, adsorption and separation, trapping highly reactive intermediates, catalyst supports, sensing, electrical memory, and drug delivery.In this Account, we tell the story of CD-MOFs, a scientific discovery made in our research laboratory at Northwestern University, and the opportunities to use these environmentally friendly porous materials across different fields of science and technology. The story includes representative synthetic protocols for the preparation of CD-MOFs, along with an overview of their structural features, functionalization, and chemical modification aimed at increasing their stabilities in aqueous environments, and finally, a summary of their applications. The examples we will discuss, however, are only illustrative, and there is a significant body of additional findings emanating from our laboratory and others, especially in the realm of developing new synthetic strategies, tuning the framework stabilities, and exploring the guest inclusion and emergent pro...

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Section: Porous Materials Based On CD Frameworkmentioning

confidence: 99%

“…H 2 S molecules could coordinate with γ ‐CD‐MOF‐K and act as a stronger water adsorption site, which avoided γ ‐CD‐MOF‐K being attacked by water molecules directly. The results showed that γ ‐CD‐MOF‐H 2 S could retain the regular structure at 60% humidity for 7 d. [ 38 ]…”

Section: Porous Materials Based On CD Frameworkmentioning

confidence: 99%

Recent Advances of Porous Materials Based on Cyclodextrin

Feng

Tan

Zhang

et al. 2021

Macromol. Rapid Commun.

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Porous materials have attracted significant attention because of their rising applications in many fields. Cyclodextrins (CDs) are suitable building units in the fabrication of porous materials owing to their intrinsic nanoporous structure, easy modification, and biocompatibility, which may result in the formation of CD‐based organic frameworks (including cyclodextrin metal‐organic frameworks (CD‐MOFs) and cyclodextrin covalent organic frameworks (CD‐COFs)), and CD‐based polymer hybrid porous materials. This review focuses on the recent progress in the fabrication and applications of CD‐based porous materials with novel structures and functionalities.

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Facile stabilization of a cyclodextrin metal–organic framework under humid environment via hydrogen sulfide treatment

Abstract: The moisture stable γ-CD-K-MOF was obtained by simply treating MOF with H2S gas. H2S acting as new water adsorption sites protected the metal–ligand bonds from water attack and thus enhanced the moisture resistance of γ-CD-K-MOF.

Cited by 41 publications

References 44 publications

Hierarchical porous carbon derived from green cyclodextrin metal‐organic framework and its application in microwave absorption

Hierarchical porous carbon derived from green cyclodextrin metal‐organic framework and its application in microwave absorption

Cyclodextrin Metal–Organic Frameworks and Their Applications

Recent Advances of Porous Materials Based on Cyclodextrin

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