scholarly journals Construction of a Luminescent Cadmium-Based Metal–Organic Framework for Highly Selective Discrimination of Ferric Ions

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6847
Author(s):  
Li-Li Xu ◽  
Qiu-Feng Zhang ◽  
Dong Wang ◽  
Guang-Wei Wu ◽  
Hong Cai
Keyword(s):  
Metal Ion ◽  
High Selectivity ◽  
Solvothermal Method ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Selective Recognition ◽  
Luminescent Intensity ◽  
Ferric Ions ◽  
Quenching Efficiency ◽  
Metal Organic

Fluorescent metal–organic frameworks (MOFs) are ideal materials for sensors because of their adjustable pore size and functional groups, which provide them with favorable metal ion selective recognition. In this paper, a new cadmium-based MOF was synthesized using Cd(NO3)2·4H2O and 3,3′,5,5′-biphenyltetracarboxylic acid by solvothermal method. CdBPTC owned three types of channels with dimensions of approximately 8.4 × 8.3 Å, 6.0 × 5.2 Å, 9.7 × 8.4 Å along a, b, and c axis, respectively. This MOF has high selectivity to ferric ions and shows excellent anti-inference ability toward many other cations. The results indicate that the fluorescence quenching efficiency of CdBPTC is close to 100% when the concentration of Fe3+ reaches 1.0 × 10−3 mol·L−1. Moreover, the luminescent intensity at 427 nm presents a linear relationship at a concentration range of 2.0 × 10−4~7.0 × 10−4 mol·L−1, which can be quantitatively expressed by the linear Stern–Volmer equation I0/I = 8489 [Fe3+] − 0.1400, which is comparable to the previously reported better-performing materials. Competitive energy absorption and ion exchange may be responsible for the variation in fluorescence intensity of CdBPTC in different Fe3+ concentrations.

Phytic acid functionalized magnetic bimetallic metal–organic frameworks for phosphopeptide enrichment

2021 ◽  
Vol 9 (7) ◽  
pp. 1811-1820
Author(s):  
Shuang Yan ◽  
Bin Luo ◽  
Jia He ◽  
Fang Lan ◽  
Yao Wu
Keyword(s):  
Phytic Acid ◽  
Efficient Method ◽  
High Selectivity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Sensitivity ◽  
Phosphopeptide Enrichment ◽  
Metal Organic ◽  
Organic Framework

Novel bimetallic metal–organic framework nanocomposites were fabricated by a facile yet efficient method. The as-prepared nanomaterial exhibited high sensitivity and high selectivity toward phosphopeptides and good reusability of five cycles for enriching phosphopeptides.

Ir-Doped Ni-based metal–organic framework ultrathin nanosheets on Ni foam for enhanced urea electro-oxidation

2020 ◽  
Vol 56 (14) ◽  
pp. 2151-2154 ◽  
Author(s):  
You Xu ◽  
Xingjie Chai ◽  
Tianlun Ren ◽  
Shanshan Yu ◽  
Hongjie Yu ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
Nickel Foam ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Ni Foam ◽  
Ultrathin Nanosheets ◽  
Metal Organic ◽  
Electro Oxidation ◽  
Organic Framework

NiIr-based metal–organic frameworks grown on a nickel foam substrate (NiIr-MOF/NF) are synthesized by a solvothermal method and directly used for urea electro-oxidation.

scholarly journals Mixed-linker approach in designing porous zirconium-based metal–organic frameworks with high hydrogen storage capacity

2016 ◽  
Vol 52 (50) ◽  
pp. 7826-7829 ◽  
Author(s):  
Ayesha Naeem ◽  
Valeska P. Ting ◽  
Ulrich Hintermair ◽  
Mi Tian ◽  
Richard Telford ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
High Selectivity ◽  
Storage Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Hydrogen Uptake ◽  
Hydrogen Storage Capacity ◽  
High Hydrogen ◽  
Metal Organic ◽  
Adsorption Of Co

New zirconium based metal–organic framework (UBMOF-31) synthesised using mixed-linker strategy showing permanent porosity, excellent hydrogen uptake, and high selectivity for adsorption of CO2 over N2.

scholarly journals Biodegradable Metal Organic Frameworks for Multimodal Imaging and Targeting Theranostics

Biosensors ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 299
Author(s):  
Xiangdong Lai ◽  
Hui Jiang ◽  
Xuemei Wang
Keyword(s):  
Metal Ion ◽  
Multimodal Imaging ◽  
Rational Design ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Organic Ligand ◽  
Therapeutic Strategies ◽  
Ion Clusters ◽  
Surface Areas ◽  
Metal Organic

Though there already had been notable progress in developing efficient therapeutic strategies for cancers, there still exist many requirements for significant improvement of the safety and efficiency of targeting cancer treatment. Thus, the rational design of a fully biodegradable and synergistic bioimaging and therapy system is of great significance. Metal organic framework (MOF) is an emerging class of coordination materials formed from metal ion/ion clusters nodes and organic ligand linkers. It arouses increasing interest in various areas in recent years. The unique features of adjustable composition, porous and directional structure, high specific surface areas, biocompatibility, and biodegradability make it possible for MOFs to be utilized as nano-drugs or/and nanocarriers for multimodal imaging and therapy. This review outlines recent advances in developing MOFs for multimodal treatment of cancer and discusses the prospects and challenges ahead.

Copper-based metal–organic framework nanoparticles for sensitive fluorescence detection of ferric ions

2019 ◽  
Vol 11 (34) ◽  
pp. 4382-4389 ◽  
Author(s):  
Fanglin Ming ◽  
Jingzhou Hou ◽  
Danqun Huo ◽  
Jun Zhou ◽  
Mei Yang ◽  
...  
Keyword(s):  
Fluorescence Detection ◽  
Solvothermal Method ◽  
Metal Organic Framework ◽  
Ferric Ions ◽  
Metal Organic ◽  
Organic Framework

A luminescent amino-functionalized metal–organic framework (Cu–MOFs) was synthesized from 2-aminoterephthalic acid and Cu(ii) ions by a solvothermal method.

scholarly journals A new approach for ultra-high adsorption of cationic methylene blue in a Zr-sulfonic-based metal–organic framework

RSC Advances ◽  
2021 ◽  
Vol 11 (58) ◽  
pp. 36626-36635
Author(s):  
Thinh T. M. Bui ◽  
Linh T. Nguyen ◽  
Nha P. H. Pham ◽  
Cuong C. Tran ◽  
Loc T. Nguyen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Solvothermal Method ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Adsorption ◽  
New Approach ◽  
Metal Organic ◽  
Organic Framework

A series of Zr-sulfonic-based metal–organic frameworks have been synthesized by the solvothermal method, namely VNU-17 and VNU-23.

scholarly journals Fabrication of Co3O4/NiCo2O4 Nanocomposite for Detection of H2O2 and Dopamine

Biosensors ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 452
Author(s):  
Tianjiao Liu ◽  
Xiaoyuan Zhang ◽  
Kun Fu ◽  
Nan Zhou ◽  
Jinping Xiong ◽  
...  
Keyword(s):  
Metal Ion ◽  
High Selectivity ◽  
Metal Organic Framework ◽  
Accessible Surface Area ◽  
Detection Range ◽  
Calcination Process ◽  
Long Term Stability ◽  
Metal Organic ◽  
Accessible Surface

Herein, the Co3O4/NiCo2O4 nanocomposite has been prepared as a novel electrochemical sensor to accurately detect hydrogen peroxide (H2O2) and glucose. ZIF-67 is a metal-organic framework (MOF) with Co as the center metal ion. Co3O4 can be obtained by calcination of ZIF-67 at 700 °C, which can retain the structure of ZIF-67. The hollow Co3O4 nanocrystal was synthesized based on a calcination process of ZIF-67. This open structure can promote the whole Co3O4/NiCo2O4 nanocomposite larger accessible surface area and reactive sites. Co3O4 has good electrocatalytic performance, which has been applied in many fields. Moreover, H2O2 and dopamine sensing tests indicate that the as-prepared non-enzymatic electrochemical biosensor has good detection properties. The testing results indicate the as-prepared biosensor has a wide detection range, low detection limit, high selectivity, and long-term stability. These testing results suggest the potential application in food security, biomedicine, environmental detection, and pharmaceutical analysis.

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>

Engineering Porosity Through Defects in a Giant Pore Metal–Organic Framework

2020 ◽  
Author(s):  
Adam Sapnik ◽  
Duncan Johnstone ◽  
Sean M. Collins ◽  
Giorgio Divitini ◽  
Alice Bumstead ◽  
...  
Keyword(s):  
Distribution Function ◽  
Ball Milling ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Defect Engineering ◽  
Metal Organic ◽  
Unsaturated Metal Sites

<p>Defect engineering is a powerful tool that can be used to tailor the properties of metal–organic frameworks (MOFs). Here, we incorporate defects through ball milling to systematically vary the porosity of the giant pore MOF, MIL-100 (Fe). We show that milling leads to the breaking of metal–linker bonds, generating more coordinatively unsaturated metal sites, and ultimately causes amorphisation. Pair distribution function analysis shows the hierarchical local structure is partially</p><p>retained, even in the amorphised material. We find that the solvent toluene stabilises the MIL-100 (Fe) framework against collapse and leads to a substantial rentention of porosity over the non-stabilised material.</p>

Metal-Organic Frameworks vs. Buffers: Case Study of UiO-66 Stability

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Slavomír Adamec ◽  
Kamil Lang ◽  
Jan Demel
Keyword(s):  
Inductively Coupled Plasma ◽  
Buffer Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Analytical Techniques ◽  
Aqueous Dispersions ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Metal Organic

<div><p>UiO-66 is a zirconium-based metal-organic framework (MOF) that has numerous applications. Our group recently determined that UiO-66 is not as inert in aqueous dispersions as previously reported in the literature. The present work therefore assessed the behaviour of UiO-66 in buffers: 2-amino-2-(hydroxymethyl)-1,3-propanediol (TRIS), 4-(2-hydroxyethyl)piperazine-1-ethane sulfonic acid (HEPES), N-ethylmorpholine (NEM) and phosphate buffer (PB), all of which are commonly used in many UiO-66 applications. High pressure liquid chromatography and inductively coupled plasma mass spectrometry were used to monitor degradation of the MOF. In each buffer, the terephthalate linker was released to some extent, with a more pronounced leaching effect in the saline forms of these buffers. The HEPES buffer was found to be the most benign, whereas NEM and PB should be avoided at any concentration as they were shown to rapidly degrade the UiO-66 framework. Low concentration TRIS buffers are also recommended, although these offer minimal buffer capacity to adjust pH. Regardless of the buffer used, rapid terephthalate release was observed, indicating that the UiO-66 was attacked immediately after mixing with the buffer. In addition, the dissolution of zirconium, observed in some cases, intensified the UiO-66 decomposition process. These results demonstrate that sensitive analytical techniques have to be used to monitor the release of MOF components so as to quantify the stabilities of these materials in liquid environments.</p></div>

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