Azobenzene-Functionalized Metal-Organic Polyhedra for the Optically Responsive Capture and Release of Guest Molecules

2014 ◽  
Vol 53 (23) ◽  
pp. 5842-5846 ◽  
Author(s):  
Jinhee Park ◽  
Lin-Bing Sun ◽  
Ying-Pin Chen ◽  
Zachary Perry ◽  
Hong-Cai Zhou
Keyword(s):  
Guest Molecules ◽  
Metal Organic ◽  
Capture And Release

Azobenzene-Functionalized Metal-Organic Polyhedra for the Optically Responsive Capture and Release of Guest Molecules

2014 ◽  
Vol 126 (23) ◽  
pp. 5952-5956 ◽  
Author(s):  
Jinhee Park ◽  
Lin-Bing Sun ◽  
Ying-Pin Chen ◽  
Zachary Perry ◽  
Hong-Cai Zhou
Keyword(s):  
Guest Molecules ◽  
Metal Organic ◽  
Capture And Release

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.

scholarly journals Gas Adsorption Selectivity in Topologically Disordered Metal–Organic Frameworks

2021 ◽  
Author(s):  
Adam Sapnik ◽  
Christopher W. Ashling ◽  
Lauren K. Macreadie ◽  
Seok J. Lee ◽  
Tim Johnson ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Interaction Strength ◽  
Functional Materials ◽  
Adsorption Selectivity ◽  
Guest Molecules ◽  
Sorption Behaviour ◽  
Ideal Adsorbed Solution Theory ◽  
Industrial Gases ◽  
Metal Organic

<div><p>Disordered metal–organic frameworks are emerging as an attractive class of functional materials, however their applications in gas storage and separation have yet to be fully explored. Here, we investigate gas adsorption in the topologically disordered Fe-BTC framework and its crystalline counterpart, MIL‑100. Despite their similar chemistry and local structure, they exhibit very different sorption behaviour towards a range of industrial gases, noble gases and hydrocarbons. Virial analysis reveals that Fe-BTC has enhanced interaction strength with guest molecules compared to MIL‑100. Most notably, we observe striking discrimination between the adsorption of C<sub>3</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>8</sub> in Fe‑BTC, with over a twofold increase in the amount of C<sub>3</sub>H<sub>6</sub> being adsorbed than C<sub>3</sub>H<sub>8</sub>. Thermodynamic selectivity towards a range of industrially relevant binary mixtures is probed using ideal adsorbed solution theory (IAST). Together, this suggests the disordered material may possess powerful separation capabilities that are rare even amongst crystalline frameworks.</p></div>

scholarly journals Power of Infrared and Raman Spectroscopies to Characterize Metal-Organic Frameworks and Investigate Their Interaction with Guest Molecules

2020 ◽  
Author(s):  
Konstantin I. Hadjiivanov ◽  
Dimitar A. Panayotov ◽  
Mihail Y. Mihaylov ◽  
Elena Z. Ivanova ◽  
Kristina K. Chakarova ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Guest Molecules ◽  
Metal Organic

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 Cooperative Binding and Stepwise Encapsulation of Drug Molecules by Sulfonylcalixarene-Based Metal-Organic Supercontainers

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2656
Author(s):  
Tian-Pu Sheng ◽  
Xin-Xia Fan ◽  
Guo-Zong Zheng ◽  
Feng-Rong Dai ◽  
Zhong-Ning Chen
Keyword(s):  
Chloroform Solution ◽  
Hill Equation ◽  
Cooperative Binding ◽  
Synthetic Receptors ◽  
Guest Molecules ◽  
Binding Behavior ◽  
Drug Molecules ◽  
Titration Curves ◽  
Metal Organic ◽  
Titration Technique

The cooperative binding behavior of a face-directed octahedral metal-organic supercontainer featuring one endo cavity and six exo cavities was thoroughly examined in chloroform solution through ultraviolet-visible (UV-Vis) titration technique using two representative drug molecules as the guests. The titration curves and their nonlinear fit to Hill equation strongly suggest the efficient encapsulation of the guest molecules by the synthetic host, which exhibit interesting cooperative and stepwise binding behavior. Based on the control experiments using tetranuclear complex as a reference, it is clear that two equivalents of the guest molecules are initially encapsulated inside the endo cavity, followed by the trapping of six additional equivalents of the drug molecules through six exo cavities (1 eq. per exo cavity), and the remaining guests are entrapped by the external pockets. The results provide an in-depth understanding of the cooperative binding behavior of metal-organic supercontainers, which opens up new opportunities for designing synthetic receptors for truly biomimetic functional applications.

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