Thermal Defect Engineering of Precious Group Metal–Organic Frameworks: A Case Study on Ru/Rh-HKUST-1 Analogues

2020 ◽  
Vol 12 (36) ◽  
pp. 40635-40647 ◽  
Author(s):  
Werner R. Heinz ◽  
Iker Agirrezabal-Telleria ◽  
Raphael Junk ◽  
Jan Berger ◽  
Junjun Wang ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Defect Engineering ◽  
Group Metal ◽  
Thermal Defect ◽  
Metal Organic

Thermal defect engineering of precious group metal–organic frameworks: impact on the catalytic cyclopropanation reaction

2020 ◽  
Vol 10 (23) ◽  
pp. 8077-8085
Author(s):  
Werner R. Heinz ◽  
Raphael Junk ◽  
Iker Agirrezabal-Telleria ◽  
Bart Bueken ◽  
Hana Bunzen ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Analytical Tool ◽  
Defect Engineering ◽  
Group Metal ◽  
Thermal Defect ◽  
Metal Organic

This work highlights the catalytic cyclopropanation and its characteristics as a novel analytical tool to investigate complex MOF structures.

Mixed precious-group metal–organic frameworks: a case study of the HKUST-1 analogue [RuxRh3−x(BTC)2]

2019 ◽  
Vol 48 (32) ◽  
pp. 12031-12039 ◽  
Author(s):  
Werner R. Heinz ◽  
Tim Kratky ◽  
Markus Drees ◽  
Andreas Wimmer ◽  
Ondřej Tomanec ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Group Metal ◽  
Metal Organic

Mixed precious-group metal–organic frameworks [RuxRh3−x(BTC)2] of the HKUST-1-type were synthesized and characterized (PXRD, BET, IR, Raman, XPS, TGA, SS-UV/VIS, EA, and HR-TEM).

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>

scholarly journals Linker depletion for missing cluster defects in non-UiO Metal-Organic Frameworks

2021 ◽  
Author(s):  
Isabel Abánades Lázaro ◽  
Neyvis Almora-Barrios ◽  
Sergio Tatay ◽  
Catalin Popescu ◽  
Carlos Martí-Gastaldo
Keyword(s):  
Metal Organic Frameworks ◽  
Defect Chemistry ◽  
Defect Engineering ◽  
Preferential Formation ◽  
Metal Organic

Defect engineering is a valuable tool to tune the properties of Metal-Organic Frameworks. However, defect chemistry remains still predominantly limited to UiO-type MOFs. We describe the preferential formation of missing...

Achieving Large Volumetric Gas Storage Capacity in Metal–Organic Frameworks by Kinetic Trapping: A Case Study of Xenon Loading in MFU-4

2018 ◽  
Vol 140 (32) ◽  
pp. 10191-10197 ◽  
Author(s):  
Hana Bunzen ◽  
Felicitas Kolbe ◽  
Andreas Kalytta-Mewes ◽  
German Sastre ◽  
Eike Brunner ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Metal Organic Frameworks ◽  
Gas Storage ◽  
Metal Organic ◽  
Kinetic Trapping

scholarly journals Band Gap Modulation in Zirconium-Based Metal-Organic Frameworks by Defect Engineering

2019 ◽  
Author(s):  
Marco Taddei ◽  
Giulia M. Schukraft ◽  
Michael E. A. Warwick ◽  
Davide Tiana ◽  
Matthew McPherson ◽  
...  
Keyword(s):  
Band Gap ◽  
Gas Phase ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Benzoic Acids ◽  
Defect Engineering ◽  
Metal Organic ◽  
Band Gap Modulation ◽  
Valence Band Energy ◽  
Defective Sites

We report a defect-engineering approach to modulate the band gap of zirconium-based metal-organic framework UiO-66, enabled by grafting of a range of amino-functionalised benzoic acids at defective sites. Defect engineered MOFs were obtained by both post-synthetic exchange and modulated synthesis, featuring band gap in the 4.1-3.3 eV range. Ab-initio calculations suggest that shrinking of the band gap is mainly due to an upward shift of the valence band energy, as a result of the presence of light-absorbing monocarboxylates. The photocatalytic properties of defect-engineered MOFs towards CO<sub>2</sub> reduction to CO in the gas phase and degradation of Rhodamine B in water were tested, observing improved activity in both cases, in comparison to a defective UiO-66 bearing formic acid as the defect-compensating species.

scholarly journals Tuning the Mechanical Response of Metal–Organic Frameworks by Defect Engineering

2018 ◽  
Vol 140 (37) ◽  
pp. 11581-11584 ◽  
Author(s):  
Stefano Dissegna ◽  
Pia Vervoorts ◽  
Claire L. Hobday ◽  
Tina Düren ◽  
Dominik Daisenberger ◽  
...  
Keyword(s):  
Mechanical Response ◽  
Metal Organic Frameworks ◽  
Defect Engineering ◽  
Metal Organic

On the Electronic and Optical Properties of Metal–Organic Frameworks: Case Study of MIL-125 and MIL-125-NH2

2020 ◽  
Vol 124 (7) ◽  
pp. 4065-4072 ◽  
Author(s):  
Gloria Capano ◽  
Francesco Ambrosio ◽  
Stavroula Kampouri ◽  
Kyriakos C. Stylianou ◽  
Alfredo Pasquarello ◽  
...  
Keyword(s):  
Optical Properties ◽  
Metal Organic Frameworks ◽  
Electronic And Optical Properties ◽  
Metal Organic
Sign in / Sign up

Export Citation Format

Share Document