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.

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.

Photo-triggered release of 5-fluorouracil from a MOF drug delivery vehicle

2018 ◽  
Vol 54 (55) ◽  
pp. 7617-7620 ◽  
Author(s):  
Kristina Roth Stefaniak ◽  
Charity C. Epley ◽  
Joshua J. Novak ◽  
Margaret L. McAndrew ◽  
Hannah D. Cornell ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Controlled Release ◽  
Small Molecules ◽  
Metal Organic Framework ◽  
Delivery Vehicle ◽  
Triggered Release ◽  
Drug Delivery Vehicle ◽  
Metal Organic ◽  
Organic Framework

A nano metal–organic-framework (nanoMOF) was employed as a first-of-its kind drug delivery vehicle (DDV) for the photo-controlled release of therapeutics with simultaneous breakdown of the carrier into small molecules.

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.

Controlled release of drug molecules in metal–organic framework material HKUST-1

2017 ◽  
Vol 79 ◽  
pp. 78-81 ◽  
Author(s):  
Qing Chen ◽  
Qi-Wei Chen ◽  
Chong Zhuang ◽  
Piao-Ping Tang ◽  
Ning Lin ◽  
...  
Keyword(s):  
Controlled Release ◽  
Metal Organic Framework ◽  
Drug Molecules ◽  
Metal Organic ◽  
Organic Framework
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