scholarly journals Coordination Modulated On-Off Switching of Flexibility in a Metal-organic Framework

2021 ◽  
Author(s):  
jorge Albalad ◽  
Ricardo Peralta ◽  
Michael Huxley ◽  
Steven Tsoukatos ◽  
Zhaolin Shi ◽  
...  
Keyword(s):  
Structural Changes ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Stimuli Responsive ◽  
Metal Organic ◽  
External Stimuli ◽  
Organic Framework

Stimuli-responsive metal-organic frameworks (MOFs) exhibit dynamic, and typically reversible, structural changes upon exposure to external stimuli. This process often induces drastic changes in their adsorption properties. Herein, we present a...

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.

Stimuli-responsive structural changes in metal–organic frameworks

2020 ◽  
Vol 56 (66) ◽  
pp. 9416-9432 ◽  
Author(s):  
Zhanning Liu ◽  
Lu Zhang ◽  
Daofeng Sun
Keyword(s):  
Structural Changes ◽  
Metal Organic Frameworks ◽  
Stimuli Responsive ◽  
Feature Article ◽  
Metal Organic ◽  
External Stimuli

This feature article mainly summarizes how the structure of MOFs changes under external stimuli.

Progress of Stimuli-Responsive Nanoscale Metal Organic Frameworks as Controlled Drug Delivery Systems

2020 ◽  
Vol 17 ◽  
Author(s):  
Ailing Feng ◽  
Yanni Wang ◽  
Jinzi Ding ◽  
Rong Xu ◽  
Xiaodong Li
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Controlled Drug Delivery ◽  
Delivery Systems ◽  
Stimuli Responsive ◽  
Direct Assembly ◽  
Metal Organic ◽  
Organic Framework

Background: Development of controlled drug delivery systems can improve the pharmacokinetic characteristics of drug molecules in the human body, thereby significantly improving the utilization rate of drugs and reducing toxicity and side effects caused by high concentrations of drugs, which can occur when delivery is not controlled. Metal organic frameworks are a new class of very promising crystalline microporous materials, especially when the size is reduced to the nanometer range. Metal organic frameworks exhibit large specific surface areas, tunable compositions, and easy functionalization. In recent years, increasing number of studies have reported the remarkable advances in multifunctional nanoscale metal organic frameworks in drug delivery. Objective: Review the latest research involving advances in stimuli-responsive nanoscale metal organic frameworks as drug delivery systems in controlled-release drugs. Discussion: We first introduce the two main strategies associated with nanoscale metal organic frameworks used in drug loading: direct assembly and post-encapsulation. We next focus on the latest discoveries of nanoscale metal organic framework-based stimulus response systems for drug delivery, including pH, magnetics, light, ion, temperature, and other stimuli, as well as multiple stimulus-responsive drug delivery systems. Finally, we discuss the challenges and future development directions of nanoscale metal organic framework-based controlled drug release.

Stimuli-responsive multifunctional metal–organic framework nanoparticles for enhanced chemo-photothermal therapy

2019 ◽  
Vol 7 (6) ◽  
pp. 994-1004 ◽  
Author(s):  
Jie Feng ◽  
Zhen Xu ◽  
Ping Dong ◽  
Wenqian Yu ◽  
Feng Liu ◽  
...  
Keyword(s):  
Antitumor Activity ◽  
Photothermal Therapy ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Stimuli Responsive ◽  
Efficient Delivery ◽  
Metal Organic ◽  
Delivery Vehicles ◽  
Organic Framework

Programmable metal–organic frameworks were prepared as efficient delivery vehicles for targeted and stimuli-responsive release of multi-therapeutics with excellent antitumor activity.

Tailoring the water adsorption properties of MIL-101 metal–organic frameworks by partial functionalization

2015 ◽  
Vol 3 (5) ◽  
pp. 2057-2064 ◽  
Author(s):  
Nakeun Ko ◽  
Pan Gyu Choi ◽  
Jisu Hong ◽  
Miso Yeo ◽  
Siyoung Sung ◽  
...  
Keyword(s):  
Water Uptake ◽  
Water Adsorption ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Low Pressure ◽  
Adsorption Properties ◽  
Uptake Capacity ◽  
Water Uptake Capacity ◽  
Metal Organic ◽  
Organic Framework

Partial functionalization of the metal–organic framework, MIL-101, with –COOH groups is proven effective for enhancing the water uptake capacity at low pressure.

scholarly journals Crystallographic characterization of the metal–organic framework Fe2(bdp)3 upon reductive cation insertion

2020 ◽  
Vol 11 (34) ◽  
pp. 9173-9180 ◽  
Author(s):  
Naomi Biggins ◽  
Michael E. Ziebel ◽  
Miguel I. Gonzalez ◽  
Jeffrey R. Long
Keyword(s):  
Single Crystal ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Organic Framework

Single-crystal X-ray diffraction reveals structural influences on gas adsorption properties in anionic metal–organic frameworks.

Design and preparation of new luminescent metal–organic frameworks and different doped isomers: sensing pollution ions and enhancement of gas capture capacity

2021 ◽  
Author(s):  
Dan Wu ◽  
Jianguo Cheng ◽  
Meng Wang ◽  
Jiao Liu ◽  
Jing Jin ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Metal Organic ◽  
New Type ◽  
Capture Capacity ◽  
Organic Framework

A new type of luminescent metal–organic framework (MOF) and different doped isomers were designed and prepared to detect pollutant ions and enhance gas adsorption properties.

Magnetic Ordering via Itinerant Ferromagnetism in a Metal-Organic Framework

2020 ◽  
Author(s):  
Jesse Park ◽  
Brianna Collins ◽  
Lucy Darago ◽  
Tomce Runcevski ◽  
Michael Aubrey ◽  
...  
Keyword(s):  
Charge Transport ◽  
Magnetic Order ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Double Exchange ◽  
Itinerant Ferromagnetism ◽  
Organic Solids ◽  
Metal Organic ◽  
Organic Framework

<b>Materials that combine magnetic order with other desirable physical attributes offer to revolutionize our energy landscape. Indeed, such materials could find transformative applications in spintronics, quantum sensing, low-density magnets, and gas separations. As a result, efforts to design multifunctional magnetic materials have recently moved beyond traditional solid-state materials to metal–organic solids. Among these, metal–organic frameworks in particular bear structures that offer intrinsic porosity, vast chemical and structural programmability, and tunability of electronic properties. Nevertheless, magnetic order within metal–organic frameworks has generally been limited to low temperatures, owing largely to challenges in creating strong magnetic exchange in extended metal–organic solids. Here, we employ the phenomenon of itinerant ferromagnetism to realize magnetic ordering at <i>T</i><sub>C</sub> = 225 K in a mixed-valence chromium(II/III) triazolate compound, representing the highest ferromagnetic ordering temperature yet observed in a metal–organic framework. The itinerant ferromagnetism is shown to proceed via a double-exchange mechanism, the first such observation in any metal–organic material. Critically, this mechanism results in variable-temperature conductivity with barrierless charge transport below <i>T</i><sub>C</sub> and a large negative magnetoresistance of 23% at 5 K. These observations suggest applications for double-exchange-based coordination solids in the emergent fields of magnetoelectrics and spintronics. Taken together, the insights gleaned from these results are expected to provide a blueprint for the design and synthesis of porous materials with synergistic high-temperature magnetic and charge transport properties. </b>

An Overview of Metal-organic Frameworks-based Acid/Base Catalysts for Biofuel Synthesis

2020 ◽  
Vol 24 (16) ◽  
pp. 1876-1891
Author(s):  
Qiuyun Zhang ◽  
Yutao Zhang ◽  
Jingsong Cheng ◽  
Hu Li ◽  
Peihua Ma
Keyword(s):  
Alternative Fuels ◽  
Heterogeneous Catalysts ◽  
Supported Catalysts ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Flexible Structures ◽  
Biodiesel Production ◽  
Biodiesel Synthesis ◽  
Metal Organic ◽  
Organic Framework

Biofuel synthesis is of great significance for producing alternative fuels. Among the developed catalytic materials, the metal-organic framework-based hybrids used as acidic, basic, or supported catalysts play major roles in the biodiesel production. This paper presents a timely and comprehensive review of recent developments on the design and preparation of metal-organic frameworks-based catalysts used for biodiesel synthesis from various oil feedstocks, including MILs-based catalysts, ZIFs-based catalysts, UiO-based catalysts, Cu-BTC-based catalysts, and MOFs-derived porous catalysts. Due to their unique and flexible structures, excellent thermal and hydrothermal stability, and tunable host-guest interactions, as compared with other heterogeneous catalysts, metal-organic framework-based catalysts have good opportunities for application in the production of biodiesel at industrial scale.

scholarly journals Crystal growth of the core and rotated epitaxial shell of a heterometallic metal-organic framework revealed with atomic force microscopy

2021 ◽  
Author(s):  
Fajar Inggit Pambudi ◽  
Michael William Anderson ◽  
Martin Attfield
Keyword(s):  
Atomic Force Microscopy ◽  
Crystal Growth ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Force Microscopy ◽  
The Core ◽  
Atomic Force ◽  
Metal Organic ◽  
Surface Crystal ◽  
Organic Framework

Atomic force microscopy has been used to determine the surface crystal growth of two isostructural metal-organic frameworks, [Zn2(ndc)2(dabco)] (ndc = 1,4-naphthalene dicarboxylate, dabco = 4-diazabicyclo[2.2.2]octane) (1) and [Cu2(ndc)2(dabco)] (2) from...

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