A5091881096- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Polyoxometalates: Synthesis and Applications
- Calcium Carbonate Crystallization and Inhibition
- Metal complexes synthesis and properties
- Covalent Organic Framework Applications
- Bone Tissue Engineering Materials
- Supramolecular Chemistry and Complexes
- Polymer Surface Interaction Studies
- Nanocluster Synthesis and Applications
- Inorganic Fluorides and Related Compounds
- Lanthanide and Transition Metal Complexes
- Carbon dioxide utilization in catalysis
- Advanced Nanomaterials in Catalysis
- Molecular Sensors and Ion Detection
- Innovative concrete reinforcement materials
- Chemical Synthesis and Characterization
- Catalytic Processes in Materials Science
- Mesoporous Materials and Catalysis
- Synthesis and Properties of Aromatic Compounds
- Fullerene Chemistry and Applications
- Advanced NMR Techniques and Applications
University of Augsburg
2016-2025
Augsburg University
2010-2020
Technical University of Munich
2019
Czech Academy of Sciences, Institute of Physics
2015-2018
Ruhr University Bochum
2014
Universität Ulm
2004-2011
Forschungszentrum Jülich
2002-2010
Slovak University of Technology in Bratislava
2010
National Institute for Materials Science
2004-2008
University of Kentucky
2008
Tuning porosity with electric fields Many metal-organic framework (MOF) compounds exhibit soft porosity—i.e., their lattices can undergo considerable deformation. Knebel et al. formed membrane layers of the MOF ZIF-8 and found that it was converted into a polar polymorph stiffer lattice in response to an applied field (see Perspective by Gascon). This change reduced gas transport but, for certain mixtures such as propane propene, also improved separation factor. Science , this issue p. 347 ; see 303
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...
Electrochromic devices fabricated by layer- by-layer assembly of europium-containing polyoxometalate clusters, poly(allylamine hydrochloride), and poly(styrenesulfonate) are investigated (see Figure). A high electrochemical contrast, adequate response time, low operation voltage, power consumption reported. further advantage these is the potential for automating their fabrication.
Using electrostatic layer-by-layer self-assembly (ELSA), the formation of multilayers with polyelectrolytes and nanoscopic polyoxometalate (POM) clusters different sizes charges is investigated. The are characterized by UV-vis absorption spectroscopy, optical ellipsometry, cyclic voltammetry, atomic force microscopy. In all cases, it possible to find experimental conditions achieve irreversible adsorption regular multilayer deposition. Most importantly, surface coverage directly related...
We describe the spontaneous self-assembly and superstructure of a discrete surfactant-encapsulated cluster, (DODA)40(NH4)2[(H2O)n⊂Mo132O372(CH3COO)30(H2O)72] (2, n ≈ 50), which consists hollow giant isopolyoxomolybdate core covered by hydrophobic shell dimethyldioctadecylammonium (DODA) cations. The structural characterization these nanoporous core−shell particles is based on small-angle X-ray scattering (SAXS) data solutions encapsulated clusters, TEM investigations, FT-IR UV−vis...
We present a comprehensive study of the partially reduced polyoxomolybdate [H3-Mo57V6(NO)6O183(H2O)18]21-encapsulated in shell dimethyldioctadecylammonium (DODA) surfacmolecules. Treatment an aqueous solution (NH4)21[H3Mo57V6-(NO)6O183(H2O)18] . 65H2O (1a) with trichloromethane surfactant leads to instant transfer encapsulated complex anion into organic phase. Results from vibrational spectroscopy. analytical ultracentrifugation, small-angle X-ray scattering, transmission electron...
The use of two tridentate ligands is the secret success for self-assembly structurally intriguing tetranuclear CoII complexes. cation [Co4(L)4]8+ (1) exists as a [2 × 2]-grid octahedrally coordinated metal ions located at corners square. complex displays multiple redox processes and potential interest development electrochemically addressable inorganic arrays (R1, R2 = H, Me; • CoII).
Structurally related to MOF-5, the cobalt(II)-containing metal–organic framework MFU-1 is stable hydrolysis. Catalytic turnover achieved in oxidation reactions with redox-active MFU-1, and solid catalyst easily recovered from reaction mixture. transformations have been shown occur inside pores of microporous solid.
Three new functionalized UiO-66-X (X = -SO(3)H, 1; -CO(2)H, 2; -I; 3) frameworks incorporating BDC-X (BDC: 1,4-benzenedicarboxylate) linkers have been synthesized by a solvothermal method using conventional electric heating. The as-synthesized (AS) as well the thermally activated compounds were characterized X-ray powder diffraction (XRPD), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, thermogravimetric (TG), and elemental analysis. occluded H(2)BDC-X molecules can be...
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...
Abstract Crystal structures of two metal–organic frameworks (MFU‐1 and MFU‐2) are presented, both which contain redox‐active Co II centres coordinated by linear 1,4‐bis[(3,5‐dimethyl)pyrazol‐4‐yl] ligands. In contrast to many MOFs reported previously, these compounds show excellent stability against hydrolytic decomposition. Catalytic turnover is achieved in oxidation reactions employing tert ‐butyl hydroperoxide the solid catalysts easily recovered from reaction mixture. Whereas...
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...
Antibiotics have recently emerged as a significant class of organic pollutants for ground and drinking water raised widespread concern due to their adverse environmental consequences. For instance, they stimulate the generation antibiotic-resistant genes that detrimental effects on entire biosphere. The removal these antibiotics from matrices has always remained daunting task. Metal–organic frameworks (MOFs) with high surface area, tunable porosity, rich structural chemistry, tailorability...
Ultrathin multilayer films of a novel molybdenum(VI) polyoxometalate cluster ((NH4)21[H3Mo57V6(NO)6O183(H2O)18]) (Mo57) and poly(allylamine hydrochloride) (PAH) have been prepared by the consecutive stepwise adsorption Mo57 PAH from dilute aqueous solution. The Mo57/PAH characterized optical spectroscopy small-angle X-ray reflectivity (XR) methods. UV−vis measurements reveal regular film growth with each adsorption. average surface density was found to be (1.4 ± 0.4) × 1013 clusters per cm2,...
Molecular or supramolecular systems capable of electro- and photostimulated color changes are still rare. We present a device design based on an electrostatic complex nanoscopic polyoxometalate cluster polyelectrolyte. The coating reversibly from transparent to blue by photo- and/or electroinduced stimulation. choice the components results in perfect transparency over entire visible range, large optical response, reversible operation, excellent stability.
A detailed analysis of the supramolecular architecture nanoporous surfactant-encapsulated cluster (SEC) with empirical formula (DODA)40(NH4)2[(H2O)n ⊂ Mo132O372(CH3CO2)30(H2O)72] 1 (n ≈ 50) is presented. The open framework Keplerate investigated by means small angle neutron scattering (SANS) in CDCl3 solutions containing discrete SECs. simplifying core–shell model developed, which describes SEC as a solvent-filled nanocavity, surrounded two concentric shells (a first polyoxometalate shell...