Study of the Dye Adsorption Kinetics of Metal–Organic Frameworks in Aqueous Media

A 36-nuclear Zr(IV) cluster based on six [Zr 6 O 4 (OH) 4 ] units is found to form three different crystal structures depending on synthesis conditions. The cubic phase (ZF-3c) is obtained when the cyclic clusters are interlinked by Na + or K + ions. In the absence of alkali metal ions, either tetragonal (ZF-3t) or hexagonal (ZF-3h) packing structures are formed. All the solids remain crystalline after evacuation, and ZF-3h possesses a permanent porosity. Upon repeated adsorptions of water vapor, the three different molecular solids comprising the same building blocks turn amorphous; however, overall uptake properties are not deteriorated and reproducible isotherms are observed featuring fast uptake at low relative humidity and unrestricted uptake at RH > 90%. A good reproducibility has also been established in cyclic adsorptiondesorption measured under dynamic flow conditions, and, especially ZF-3t displays the working capacity 2.7 times that of zeolite 4A thanks to the fast desorption kinetics.

Section: Bulletin Of the Korean Chemical Societymentioning

confidence: 99%

Static and Dynamic Adsorptions of Water Vapor by Cyclic [Zr₃₆] Clusters: Implications for Atmospheric Water Capture Using Molecular Solids

Choi

Moon

Chun

2020

“…As a result, MOFs have been considered as a promising material for a broad variety of applications including gas capture/storage, catalysis, drug delivery, and energy storage. [21][22][23] Moreover, MOFs are utilized as a sacrificial-template for a wide range of nano-and microstructures with compositional and structural divergence. [24][25][26][27][28][29] The versatility of MOF-based materials, as reflected by MOFs, MOF-derived hybrids (MDHs), MOF-derived carbons (MDCs), enables MOF-based materials to serve a design platform for fabricating cathodes and separators with desirable properties that address the aforementioned issues of Li S batteries.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of Metal–Organic Framework‐Based Materials for Advanced LiS Batteries

Park

Kim

Yang

2020

Metal-organic framework (MOF) and their derivatives have been considered a promising material in the field of energy storage and conversion systems. Their distinct properties, including high porosity, tunable composition, and structure, enable the design of materials with tailored properties for achieving high performance. Lithium sulfur (Li S) batteries have several issues that prevent their broad application, including the low conductivity of sulfur, presence of soluble intermediates, and slow redox kinetics. MOF-based materials are a synthetic platform that is well positioned to mitigate these issues. This review highlights three essential function of Li S batteries and classifies recently developed MOF-based materials with respect to these functions. The design principles identified by such function-based classification provide guidance and perspective to rationally design MOF-based materials for advanced Li S batteries.

“…12,13 Several excellent previous reports demonstrated the efficacy of encapsulation of dyes by MOFs. [14][15][16][17][18] Traditionally, dye encapsulation has been used for the clear demonstration of encapsulating various sizes of guests because of the color change of MOF crystals before and after encapsulation. 14,15,18 More recently, the encapsulation of dyes is thought to be an ideal method to control the captured dyes' photophysical properties via encapsulation into MOF channels.…”

Section: Introductionmentioning

confidence: 99%

Photophysical Properties and Electrochromism of Viologen Encapsulated Viologen@InBTB Metal–Organic Framework

Yoon

Kim

et al. 2020

The encapsulation of various types of guest molecules into the preorganized channels of metal-organic frameworks (MOFs) is continuously motivating chemists searching for better MOF host materials to systematically alter or control the photophysical properties of the captured guests in a controlled manner. The unique spatial distribution and a certain preferential geometry of the guests inside MOFs often render guests to exhibit distinct optical properties. Three different viologen cations were encapsulated into the mesoscale channels of negatively charged InBTB MOF ([Et 2 NH 2 ] 3 [In 3 (BTB) 4 ]Á10DEFÁ14H 2 O, H 3 BTB = 1,3,5-benzenetribenzoic acid) via cation exchange process. The cationic viologens were partially encapsulated through cation exchange with [Et 2 NH 2 ] + counter-cations to afford viologen@InBTB. The colorless InBTB crystals changed into yellow in the case of viologen@InBTB. The fluorescence measurement of methylviologen (MV 2+) encapsulated MV@InBTB showed different behavior compared to ethylviologen (EV 2+) and benzylviologen (BV 2+) encapsulated InBTB. Both EV@InBTB and BV@InBTB exhibited unusual quenching of the photoluminescence emission in solid state.