A5084435572- Metal-Organic Frameworks: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Covalent Organic Framework Applications
- Inorganic Fluorides and Related Compounds
- Metal complexes synthesis and properties
- Crystal Structures and Properties
- Carbon dioxide utilization in catalysis
- Gas Sensing Nanomaterials and Sensors
- Membrane Separation and Gas Transport
- Material Dynamics and Properties
- Zeolite Catalysis and Synthesis
- Hydrogen Storage and Materials
- Magnesium Oxide Properties and Applications
- Silicon Effects in Agriculture
- Geology and Paleoclimatology Research
- Chemical Synthesis and Characterization
- Multiferroics and related materials
- Theoretical and Computational Physics
- Advanced NMR Techniques and Applications
- Industrial Gas Emission Control
- Dendrimers and Hyperbranched Polymers
- Analytical Chemistry and Sensors
University of Augsburg
2011-2020
Czech Academy of Sciences, Institute of Physics
2018
Augsburg University
2012-2017
University of Hohenheim
2010
Abstract Today, surface acoustic waves (SAWs) and bulk are already two of the very few phononic technologies industrial relevance can been found in a myriad devices employing these nanoscale earthquakes on chip. Acoustic radio frequency filters, for instance, integral parts wireless devices. SAWs particular find applications life sciences microfluidics sensing mixing tiny amounts liquids. In addition to this continuously growing number applications, ideally suited probe control elementary...
A highly porous member of isoreticular MFU-4-type frameworks, [Zn(5)Cl(4)(BTDD)(3)] (MFU-4l(arge)) (H(2)-BTDD=bis(1H-1,2,3-triazolo[4,5-b],[4',5'-i])dibenzo[1,4]dioxin), has been synthesized using ZnCl(2) and H(2)-BTDD in N,N-dimethylformamide as a solvent. MFU-4l represents the first example frameworks featuring large pore apertures 9.1 Å. Here, serves reference compound to evaluate origin unique specific gas-sorption properties MFU-4, reported previously. The latter framework features...
The metal-organic framework, MFU-4, possessing small cavities and apertures, is exploited for quantum sieving of hydrogen isotopes. Quantum mechanically, a molecule confined in cavity shows an increase effective size depending on the particle mass, which leads to faster deuterium adsorption from H2/D2 isotope mixture. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized online delivery, but not...
Postsynthetic metal and ligand exchange is a versatile approach towards functionalized MFU-4l frameworks. Upon thermal treatment of formates, coordinatively strongly unsaturated centers, such as zinc(II) hydride or copper(I) species, are generated selectively. Cu(I)-MFU-4l prepared in this way was stable under ambient conditions showed fully reversible chemisorption small molecules, O2, N2, H2, with corresponding isosteric heats adsorption 53, 42, 32 kJ mol(-1), respectively, determined by...
The production of pure deuterium and the removal tritium from nuclear waste are key challenges in separation light isotopes. Presently, technological methods extremely energy- cost-intensive. Here we report capture heavy hydrogen isotopes gas by selective adsorption at Cu(I) sites a metal-organic framework. At strongly binding (32 kJ mol-1) quantum effects result higher enthalpies heavier mechanism takes place most efficiently temperatures above 80 K, when an isotope exchange allows...
Postsynthetic metal ion exchange in a benzotriazolate-based MFU-4l(arge) framework leads to Co(II)-containing with open sites showing reversible gas-phase oxidation properties.
The electronic structures and band gaps of MFU‐4‐type metal‐organic frameworks can be systematically engineered leading to a family isostructural microporous solids. Electrical properties the microcrystalline samples are investigated by temperature‐dependent broad‐band dielectric optical spectroscopy, which corroborated full structure calculations performed for framework cluster model compounds at multiple levels density functional theory. combined results glean detailed picture relative...
Abstract The isomorphous partial substitution of Zn 2+ ions in the secondary building unit (SBU) MFU‐4 l leads to frameworks with general formula [M x (5– ) Cl 4 (BTDD) 3 ], which ≈2, M=Mn II , Fe Co Ni or Cu and BTDD=bis(1,2,3‐triazolato‐[4,5‐b],[4′,5′‐i])dibenzo‐[1,4]‐dioxin. Subsequent exchange chloride ligands by nitrite, nitrate, triflate, azide, isocyanate, formate, acetate, fluoride a variety derivatives, have been characterized using XRPD, EDX, IR, UV/Vis‐NIR, TGA, gas sorption...
Observation of the kinetics and measurement activation energies for gas diffusion in porous materials requires very fast sensitive sensors. In this work, thin films metal–organic frameworks (MOFs) with different pore sizes are grown on a surface acoustic wave (SAW) substrate, resulting specific sensor systems detection various gases at short time scales. Using specially designed SAW delay lines detection, up to 200-nm-wide cubic MOF crystals were directly from solution chip area. One...
Two perfluorinated metal hydroxo terephthalates [MIII(OH)(BDC-F)]·n(guests) (MIII = V, MIL-47-F-AS or 1-AS; Al, Al-MIL-53-F-AS 2-AS) (BDC-F 2-fluoro-1,4-benzenedicarboxylate; AS as-synthesized) have been synthesized by a hydrothermal method using microwave irradiation (1-AS) conventional electric heating (2-AS), respectively. The unreacted occluded H2BDC-F molecules can be removed under vacuum direct thermal activation exchange of guest followed treatment leading to the empty-pore forms...
The novel homochiral metal–organic framework CFA-1 (Coordination Framework Augsburg-1), [Zn5(OAc)4(bibta)3], containing the achiral linker {H2-bibta = 1H,1′H-5,5′-bibenzo[d][1,2,3]triazole}, has been synthesised. reaction of H2-bibta and Zn(OAc)2·2H2O in N-methylformamide (NMF) (90 °C, 3 d) yields as trigonal prismatic single crystals. serves a convenient precursor for synthesis isostructural frameworks with redox-active metal centres, which is demonstrated by postsynthetic exchange Zn2+...
Abstract Metal–organic frameworks with extremely large specific surface areas can reach very high gravimetric hydrogen storage capacities. However, these ultra‐porous materials possess typically a low density and, therefore, poor volumetric capacity. Here we study experimentally the influence of interpenetration on and capacity by comparing two metal–organic MFU‐4 family, non‐interpenetrated l CFA‐7 an interpenetrated structure. At 77 K absolute uptake is more than twice that .
As<sub>2</sub>O<sub>3</sub>was introduced as an anion into MOF nanoparticles<italic>via</italic>a postsynthetic ligand exchange; material cytotoxicity was investigated<italic>in vitro</italic>.
Column experiments on phytolith transport were conducted to assess the partial contributions of water percolation and earthworm activity in loamy sandy soils. Six intact cores a Haplic Cambisol nine silty Stagnic Luvisol excavated. With Luvisol, three treatments perfomed: treatment with periodic irrigation, but without earthworms, irrigation earthworms ( Aporrectodea caliginosa ) control. The did not contain hence only control tested. phytoliths common reed Phragmites australis labelled...
The syntheses of H2-phbpz, [Cu2(phbpz)]·2DEF·MeOH (CFA-2) and [Ag2(phbpz)] (CFA-3) (H2-phbpz = 3,3′,5,5′-tetraphenyl-1H,1′H-4,4′-bipyrazole) compounds their crystal structures are described. Cu(I) containing metal–organic framework CFA-2 crystallizes in the tetragonal system, within space group I41/a (no. 88) following unit cell parameters: a 30.835(14), c 29.306(7) Å, V 27 865(19) Å3. features flexible 3-D three-connected two-fold interpenetrated porous structure constructed triangular...
The novel metal-organic framework CFA-8 (Coordination Framework Augsburg University-8), [Cu2(tqpt)], containing the organic linker H2-tqpt {H2-tqpt = 6,6,14,14-tetramethyl-6,14-dihydroquinoxalino[2,3-b]phenazinebis-triazole}, has been synthesized. Reaction of and anhydrous CuCl2 in N,N-dimethylacetamide (DMA) yields as orange crystals with lenticular shape. This shows a reversible breathing effect is robust upon solvent removal. It characterized by single-crystal powder X-ray diffraction,...
A 12-connected metal-organic framework based on an unprecedented cyclic Cu(12) cluster with a large internal cavity has been prepared, and its cation exchange property was determined.
The novel interpenetrated metal-organic framework CFA-7 (Coordination Framework Augsburg University-7), [Zn5Cl4(tqpt)3], has been synthesized containing the organic linker {H2-tqpt = 6,6,14,14-tetramethyl-6,14-dihydroquinoxalino[2,3-b]phenazinebistriazole}. Reaction of H2-tqpt and anhydrous ZnCl2 in N,N-dimethylformamide (DMF) yields as pseudo-cubic crystals. serves precursor for synthesis isostructural frameworks with redox-active metal centers, which is demonstrated by postsynthetic...
Schematic view of the pore system MFU-4. Two small pores, formed by chlorine ligands in cubic shape, are highlighted. Left: CO<sub>2</sub> molecule a pore. Right: N<sub>2</sub>
Abstract Within the so-called “no-man’s land” between about 150 and 235 K, crystallization of bulk water is inevitable. The glass-like freezing a liquid-to-liquid transition water, predicted to occur in this region, can be investigated by confining nanometer-sized pores. Here, we report molecular dynamics within pores metal-organic framework using dielectric spectroscopy. detected temperature-dependent supercooled matches that as reported outside borders no-man’s land. In confinement,...
The metal–organic framework [Cu(ta)2] (Hta = 1H-1,2,3-triazole), containing Jahn–Teller active Cu(II) ions and 1,2,3-triazolate ligands, is prepared under solvothermal reaction conditions. compound shows a reversible phase transition from the tetragonal crystal system (α-[Cu(ta)2]: space group I41/amd (no. 141), 11.8447(7) Å, c 18.9782(13) V 2662.6(3) Å3) to cubic (β-[Cu(ta)2]: Fdm 227), 17.4416(15) 5305.9(8) within temperature range of 120–160 °C. Both polymorphs have identical bonding...