Dynamic Topochemical Reaction Tuned by Guest Molecules in the Nanospace of a Metal–Organic Framework

2019 ◽  
Vol 141 (40) ◽  
pp. 15742-15746 ◽  
Author(s):  
Shinpei Kusaka ◽  
Atsushi Kiyose ◽  
Hiroshi Sato ◽  
Yuh Hijikata ◽  
Akihiro Hori ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Topochemical Reaction ◽  
Guest Molecules ◽  
Metal Organic ◽  
Organic Framework

Synthesis and Structure of a Clathrated Two-Dimensional Metal-Organic Framework: [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2·H2O (L = Bis(1-pyrazinylethylidene)hydrazine)

2008 ◽  
Vol 73 (1) ◽  
pp. 24-31
Author(s):  
Dayu Wu ◽  
Genhua Wu ◽  
Wei Huang ◽  
Zhuqing Wang
Keyword(s):  
Metal Organic Framework ◽  
Channel Structure ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Square Planar ◽  
Metal Organic ◽  
Aqueous Meoh ◽  
Organic Framework

The compound [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2 was obtained by the reaction of Cd(ClO4)2, bis(1-pyrazinylethylidene)hydrazine (L) and 4,4'-bipyridine in aqueous MeOH. Single-crystal X-ray diffraction has revealed its two-dimensional metal-organic framework. The 2-D layers superpose on each other, giving a channel structure. The square planar grids consist of two pairs of shared edges with Cd(II) ion and a 4,4'-bipyridine molecule each vertex and side, respectively. The square cavity has a dimension of 11.817 × 11.781 Å. Two guest molecules of bis(1-pyrazinylethylidene)hydrazine are clathrated in every hydrophobic host cavity, being further stabilized by π-π stacking and hydrogen bonding. The results suggest that the hydrazine molecules present in the network serve as structure-directing templates in the formation of crystal structures.

scholarly journals Metal-Organic Framework-Based Stimuli-Responsive Polymers

2021 ◽  
Vol 5 (4) ◽  
pp. 101
Author(s):  
Menglian Wei ◽  
Yu Wan ◽  
Xueji Zhang
Keyword(s):  
Metal Organic Framework ◽  
Chemical Properties ◽  
Stimuli Responsive ◽  
Guest Molecules ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Reversible Phase Transition ◽  
Metal Organic ◽  
External Stimuli ◽  
Organic Framework

Metal-organic framework (MOF) based stimuli-responsive polymers (coordination polymers) exhibit reversible phase-transition behavior and demonstrate attractive properties that are capable of altering physical and/or chemical properties upon exposure to external stimuli, including pH, temperature, ions, etc., in a dynamic fashion. Thus, their conformational change can be imitated by the adsorption/desorption of target analytes (guest molecules), temperature or pressure changes, and electromagnetic field manipulation. MOF-based stimuli responsive polymers have received great attention due to their advanced optical properties and variety of applications. Herein, we summarized some recent progress on MOF-based stimuli-responsive polymers (SRPs) classified by physical and chemical responsiveness, including temperature, pressure, electricity, pH, metal ions, gases, alcohol and multi-targets.

Solvent exchange in a metal–organic framework single crystal monitored by dynamicin situX-ray diffraction

2017 ◽  
Vol 73 (4) ◽  
pp. 669-674 ◽  
Author(s):  
Jordan M. Cox ◽  
Ian M. Walton ◽  
Gage Bateman ◽  
Cassidy A. Benson ◽  
Travis Mitchell ◽  
...  
Keyword(s):  
Rational Design ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
Time Resolved ◽  
Ethanol Solvate ◽  
Significant Step ◽  
Metal Organic ◽  
Flexible Metal ◽  
Organic Framework

Understanding the processes by which porous solid-state materials adsorb and release guest molecules would represent a significant step towards developing rational design principles for functional porous materials. To elucidate the process of liquid exchange in these materials, dynamicin situX-ray diffraction techniques have been developed which utilize liquid-phase chemical stimuli. Using these time-resolved diffraction techniques, the ethanol solvation process in a flexible metal–organic framework [Co(AIP)(bpy)0.5(H2O)]·2H2O was examined. The measurements provide important insight into the nature of the chemical transformation in this system including the presence of a previously unreported neat ethanol solvate structure.

Metal–organic framework tethering pH- and thermo-responsive polymer for ON–OFF controlled release of guest molecules

CrystEngComm ◽  
2020 ◽  
Vol 22 (6) ◽  
pp. 1106-1111
Author(s):  
Shunjiro Nagata ◽  
Kenta Kokado ◽  
Kazuki Sada
Keyword(s):  
Controlled Release ◽  
Metal Organic Framework ◽  
Guest Molecules ◽  
Responsive Polymer ◽  
Metal Organic ◽  
Organic Framework

Metal–organic framework tethering pH- and thermo-responsive polymer underwent ON–OFF controlled release of the included guest molecules.

scholarly journals Detection of Adsorbates on Emissive MOF Surfaces with X-Ray Photoelectron Spectroscopy

2018 ◽  
Author(s):  
Shawn Burdette ◽  
Jingjing Yan ◽  
Ron Grimm ◽  
Peter Mueller ◽  
Alexander Carl ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Analytical Approach ◽  
Metal Organic Framework ◽  
Model System ◽  
Guest Molecules ◽  
X Ray ◽  
Phenol Derivatives ◽  
Metal Organic ◽  
Azobenzene Chromophore ◽  
Organic Framework

A metal organic framework containing an azobenzene chromophore exhibits luminescence that is quenched by nitro-phenol derivatives. The model system was used to develop an new analytical approach to differentiating between encapsulated guest molecules and those adsorbed on the outside of the MOF

Efficient detection of Cr3+ and Cr2O72− using a Zn(ii) luminescent metal–organic framework

2020 ◽  
Vol 44 (18) ◽  
pp. 7293-7299
Author(s):  
Qi Guo ◽  
Tingting Ma ◽  
Liuqing Zhou ◽  
Jing-xin Ma ◽  
Jinhui Yang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Guest Molecules ◽  
Efficient Detection ◽  
Metal Organic ◽  
Luminescent Sensing ◽  
Organic Framework

We constructed a new luminescent metal–organic framework, [Zn2(TCBPDC)0.5(H2O)2]n·G (G = guest molecules), and realized an efficiently luminescent sensing for Cr3+ and Cr2O72−.

A Highly Flexible Metal-Organic Framework Constructed from Asymmetric Flexible Linkers and Heptanuclear Zinc Carboxylate Secondary Building Units and its Anisotropic Dynamic Responses Exhibited During Guest Removal and Single Crystal Coordinated Solvent Exchange

2019 ◽  
Author(s):  
Elliot J Carrington ◽  
Rémi Pétuya ◽  
Rebecca K Hylton ◽  
Yong Yan ◽  
Dmytro Antypov ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Structural Response ◽  
Dynamic Responses ◽  
Solvent Exchange ◽  
Void Space ◽  
Guest Molecules ◽  
Secondary Building Units ◽  
Metal Organic ◽  
Flexible Metal ◽  
Organic Framework

<p>A new porous and flexible metal-organic framework (MOF) has been synthesised from the flexible asymmetric linker N-(4-Carboxyphenyl)succinamate (CSA) and heptanuclear zinc oxo-clusters of formula [Zn<sub>7</sub>O<sub>2</sub>(Carboxylate)<sub>10</sub>DMF<sub>2</sub>] involving two coordinated terminal DMF ligands. The structural response of this MOF to the removal or exchange of its guest molecules has been probed using a combination of experimental and computational approaches. The topology of the material, involving double linker connections in the <i>a</i> and <i>b</i> directions and single linker connections along the <i>c</i> axis, is shown to be key in the materials anisotropic response. The <i>a</i> and <i>b</i> directions remain locked during guest removal, while the <i>c</i> axis linker undergoes large changes significantly reducing the material’s void space. The changes to the <i>c</i> axis linker involve a combination of a hinge motion on the linker’s rigid side and conformational rearrangements on its flexible end, which were probed in detail during this process despite the presence of crystallographic disorder along this axis which prevented accurate characterisation by experimental methods alone. While inactive during guest removal, the flexible ends of the <i>a</i> and <i>b</i> axis linkers are observed to play a prominent role during DMF to DMSO solvent exchange, facilitating the exchange reaction arising in the cluster.</p>

Probing Time Dependent Phase Transformation in a Flexible Metal-Organic Framework with Nanoindentation

2021 ◽  
Author(s):  
Prakash Kanoo ◽  
Manish Kumar Mishra ◽  
Arpan Hazra
Keyword(s):  
Phase Transformation ◽  
Phase Transitions ◽  
Room Temperature ◽  
Metal Organic Framework ◽  
Time Dependent ◽  
Guest Molecules ◽  
Nanoindentation Technique ◽  
Metal Organic ◽  
Flexible Metal ◽  
Organic Framework

Phase transformation in a flexible metal-organic framework, {[Zn4(1,4-NDC)4(1,2-BPE)2]•xSolvent}n, which loses guest molecules rapidly at room temperature, leading to several phase transitions, is examined using nanoindentation technique. Nanoindentation results reveal time...

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