scholarly journals New insights into solvent-induced structural changes of 13C labelled metal–organic frameworks by solid state NMR

2019 ◽  
Vol 55 (62) ◽  
pp. 9140-9143 ◽  
Author(s):  
Marcus Rauche ◽  
Sebastian Ehrling ◽  
Simon Krause ◽  
Irena Senkovska ◽  
Stefan Kaskel ◽  
...  
Keyword(s):  
Solid State Nmr ◽  
Structural Changes ◽  
Metal Organic Frameworks ◽  
Site Specific ◽  
Isotope Labelling ◽  
Specific Host ◽  
Depth Analysis ◽  
Adsorption Complexes ◽  
Metal Organic ◽  
Labelling Scheme

The proposed 13C isotope-labelling scheme enables the in-depth analysis of site-specific host–guest interactions and adsorption complexes formed in MOFs.

Adsorption of Small Molecules on Cu3(btc)2 and Cu3–xZnx(btc)2 Metal–Organic Frameworks (MOF) As Studied by Solid-State NMR

2013 ◽  
Vol 117 (15) ◽  
pp. 7703-7712 ◽  
Author(s):  
Farhana Gul-E-Noor ◽  
Matthias Mendt ◽  
Dieter Michel ◽  
Andreas Pöppl ◽  
Harald Krautscheid ◽  
...  
Keyword(s):  
Solid State ◽  
Small Molecules ◽  
Solid State Nmr ◽  
Metal Organic Frameworks ◽  
Metal Organic

3-(4-Methylthiophenyl)acetylacetone – ups and downs of flexibility in the synthesis of mixed metal–organic frameworks. Ditopic bridging of hard and soft cations and site-specific desolvation

CrystEngComm ◽  
2020 ◽  
Vol 22 (6) ◽  
pp. 1041-1049 ◽  
Author(s):  
Hans Gildenast ◽  
Stephanie Nölke ◽  
Ulli Englert
Keyword(s):  
Metal Organic Frameworks ◽  
Site Specific ◽  
Mixed Metal ◽  
Metal Organic

Different Pearson-hardness of O and S donors leads to well-ordered mixed metal–organic frameworks.

Long and local range structural changes in M[(bdc)(ted)0.5] (M = Zn, Ni or Cu) metal organic frameworks upon spontaneous thermal dispersion of LiCl and adsorption of carbon dioxide

2015 ◽  
Vol 212 ◽  
pp. 8-17 ◽  
Author(s):  
Jennifer Guerrero-Medina ◽  
Génesis Mass-González ◽  
Leonardo Pacheco-Londoño ◽  
Samuel P. Hernández-Rivera ◽  
Riqiang Fu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Structural Changes ◽  
Metal Organic Frameworks ◽  
Thermal Dispersion ◽  
Metal Organic ◽  
Local Range

Tuning Packing, Structural Flexibility, and Porosity in 2D Metal–Organic Frameworks by Metal Node Choice

2019 ◽  
Vol 72 (10) ◽  
pp. 797 ◽  
Author(s):  
Witold M. Bloch ◽  
Christian J. Doonan ◽  
Christopher J. Sumby
Keyword(s):  
Structural Changes ◽  
Metal Organic Frameworks ◽  
Chemical Properties ◽  
Complete Removal ◽  
Structural Flexibility ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
Metal Organic ◽  
Physical And Chemical ◽  
And Chemical Properties

Understanding the key features that determine structural flexibility in metal–organic frameworks (MOFs) is key to exploiting their dynamic physical and chemical properties. We have previously reported a 2D MOF material, CuL1, comprising five-coordinate metal nodes that displays exceptional CO2/N2 selectively (L1=bis(4-(4-carboxyphenyl)-1H-pyrazolyl)methane). Here we examine the effect of utilising six-coordinate metal centres (CoII and NiII) in the synthesis of isostructural MOFs from L1, namely CoL1 and NiL1. The octahedral geometry of the metal centre within the MOF analogues precludes an ideal eclipse of the 2D layers, resulting in an offset stacking, and in certain cases, the formation of 2-fold interpenetrated analogues β-CoL1 and β-NiL1. We used a combination of thermogravimetric analysis (TGA), and powder and single crystal X-ray diffraction (PXRD and SCXRD) to show that desolvation is accompanied by a structural change for NiL1, and complete removal of the coordinated H2O ligands results in a reduction in long-range order. The offset nature of the 2D layers in combination with the structural changes impedes the adsorption of meaningful quantities of gases (N2, CO2), highlighting the importance of a five-coordinate metal centre in achieving optimal pore accessibility for this family of flexible materials.

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.

In depth analysis of the in vivo toxicity of nanoparticles of porous iron(iii) metal–organic frameworks

2013 ◽  
Vol 4 (4) ◽  
pp. 1597 ◽  
Author(s):  
Tarek Baati ◽  
Leila Njim ◽  
Fadoua Neffati ◽  
Abdelhamid Kerkeni ◽  
Muriel Bouttemi ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Porous Iron ◽  
In Vivo Toxicity ◽  
Depth Analysis ◽  
Metal Organic

scholarly journals Integration of Fluorescent Functionality into Pressure Amplifying Metal-Organic Frameworks

2021 ◽  
Author(s):  
Francesco Walenszus ◽  
Jack D. Evans ◽  
Volodymyr Bon ◽  
Friedrich Schwotzer ◽  
Irena Senkovska ◽  
...  
Keyword(s):  
Structural Changes ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Metal Exchange ◽  
Limited Information ◽  
X Ray Diffraction ◽  
Metal Organic ◽  
Synthetic Metal ◽  
External Stimuli ◽  
Highly Porous

The flexibility of soft porous crystals, i.e., their ability to respond to external stimuli with structural changes, is one of the most fascinating features of metal-organic frameworks. In addition to breathing and swelling phenomena of flexible MOFs, negative gas adsorption and pressure amplification is one of the more recent discoveries in this field, initially observed in the cubic DUT-49 framework. In recent years the structural contraction was monitored by physisorption, X‑ray diffraction, NMR and EPR techniques, providing only limited information about the electronic structure of the ligand. In this work we designed a new ligand with a fluorescent core in the linker backbone and synthesized three new MOFs, isoreticular to DUT-49, denoted as DUT‑140(M) (M - Cu, Co, Zn) crystalizing in space group. DUT‑140(Cu) can be desolvated and is highly porous with an accessible apparent surface area of 4870 m2g-1 and a pore volume of 2.59 cm3g-1. Furthermore, it shows flexibility and NGA upon adsorption of subcritical gases. DUT-140(Zn), synthesized using post-synthetic metal exchange, could only be studied with guests in the pores. In addition to the investigation of the adsorption behavior of DUT-140(Cu) spectroscopic and computational methods were used to study the light absorption properties.

scholarly journals New insights on the supramolecular structure of highly porous core–shell drug nanocarriers using solid-state NMR spectroscopy

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32472-32475
Author(s):  
Marianna Porcino ◽  
Ioanna Christodoulou ◽  
Mai Dang Le Vuong ◽  
Ruxandra Gref ◽  
Charlotte Martineau-Corcos
Keyword(s):  
Drug Delivery ◽  
Solid State ◽  
Solid State Nmr ◽  
Metal Organic Frameworks ◽  
Core Shell ◽  
Porous Core ◽  
Engineered Surfaces ◽  
Metal Organic ◽  
Drug Nanocarriers ◽  
Highly Porous

Nano-sized metal–organic frameworks (nanoMOFs), with engineered surfaces to enhance the targeting of the drug delivery, have proven efficient as drug nanocarriers.

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