A5036870633- Inorganic Fluorides and Related Compounds
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Fullerene Chemistry and Applications
- Advanced Chemical Physics Studies
- Solid-state spectroscopy and crystallography
- Crystallography and molecular interactions
- Luminescence Properties of Advanced Materials
- Inorganic Chemistry and Materials
- Catalytic Processes in Materials Science
- Crystal Structures and Properties
- Chemical Synthesis and Characterization
- Catalysis and Oxidation Reactions
- Carbon Nanotubes in Composites
- Fluorine in Organic Chemistry
- Boron and Carbon Nanomaterials Research
- Graphene research and applications
- Ammonia Synthesis and Nitrogen Reduction
- Layered Double Hydroxides Synthesis and Applications
- Zeolite Catalysis and Synthesis
- Crystal structures of chemical compounds
- Advanced NMR Techniques and Applications
- Thermal and Kinetic Analysis
- Metal-Organic Frameworks: Synthesis and Applications
- Silicone and Siloxane Chemistry
Humboldt-Universität zu Berlin
2013-2022
Laboratoire de Synthèse Organique
2017
Lomonosov Moscow State University
2004-2015
University of Science and Technology of China
2014-2015
Hefei National Center for Physical Sciences at Nanoscale
2014-2015
Division of Chemistry
2015
National Chemical Laboratory
2014
University of Bucharest
2011-2012
Romanian Academy
2011
National Institute of Materials Physics
2011
Super acidic solids: A new two-step route to high-surface-area metal fluorides is reported, by which amorphous AlF3 can be prepared having a BET(N2) surface area of more than 200 m2 g−1 (see SEM image). This HS-AlF3 shows very high Lewis acidity and consequently catalytic activity.
'Al'l about F: Aluminum chlorofluoride (ACF) catalyzes the hydrodefluorination, as well Friedel–Crafts reactions of fluorinated methanes in presence Et3SiH. A surface-bound silylium-ion-like species is considered to be a crucial intermediate achieving CF bond cleavage.
Chlorination of C60 with SbCl5, ICl, or ICl3 at 220–250 °C gives the highly chlorinated fullerene C60Cl30. The carbon cage C60Cl30 molecule has a unique cylindrical shape (see picture), composed two aromatic six-membered rings located opposite each other and one equatorial 18π trannulene belt. DFT calculations suggest that is final product [60]fullerene chlorination.
Novel magnesium fluorides have been prepared by a new fluorolytic sol-gel synthesis for fluoride materials based on aqueous HF. By changing the amount of water at constant stoichiometric HF, it is possible to tune surface acidity resulting partly hydroxylated fluorides. These possess medium-strength Lewis acid sites and, increasing water, Brønsted as well. Magnesium hydroxyl groups normally basic nature and only with this synthetic route create acidic groups. XRD, MAS NMR, TEM, thermal...
Functionalization reactions of the refrigerants HFO-1234yf (2,3,3,3-tetrafluoropropene) and HFO-1234ze (1,3,3,3-tetrafluoropropene) were developed. The selectivity reactivity towards CF3 groups C-F activation can be controlled by employing either a germane or silane as hydrogen source. Unique transformations designed to accomplish consecutive hydrogermylation steps. This allowed for an unprecedented transformation olefinic bond into C-H heterogeneous catalysis. These are catalyzed nanoscopic...
Highly Lewis acidic aluminium fluorides are interesting heterogeneous catalysts for many reactions, especially C–H and C–F bonds can be activated at room temperature.
Nanoscale metal fluorides and hydroxide prepared according the <italic>fluorolytic</italic> sol–gel synthesis represent a powerful class of bi-acidic heterogeneous catalysts.
A series of niobium-modified aluminum hydroxide fluorides (denoted Nb@AlF3), prepared via a fluorolytic sol–gel synthesis was investigated for the catalytic one-pot conversion cellulose to lactic acid. The structure new acid catalysts is result dispersion niobium fluoride in an matrix. calcination at relatively low temperature (350 °C) stabilized this structure. Catalytic performances terms yields are directly correlated with content.
Easy upscaleable one-pot synthesis method at room temperature for ultra small sized Eu<sup>3+</sup>- and Tb<sup>3+</sup>-doped CaF<sub>2</sub> nanoparticles.
Amorphous materials—magnesium oxide fluoride with hydroxy groups—of high surface area were prepared for the first time by a soft sol–gel method involving initial fluorination and subsequent hydrolysis of fluorinated gel. Their structural properties studied XRD, FTIR, XPS, 19F MAS NMR. The magnesium fluorides groups also tested as heterogeneous catalysts in Michael additions. incorporation F into MgO network led to diverse fluorine coordinations areas. introduction framework enables tuning...
The recently developed fluorolytic sol–gel route to metal fluorides opens a very broad range of both scientific and technical applications the accessible high surface area fluorides, many them have already been applied or tested. Specific chemical properties such as Lewis acidity physical area, meso-porosity nano-size well possibility apply on surfaces via non-aqueous sol make synthesis versatile one. scope its use state art are presented.
Abstract By using modern XPS systems it is possible to obtain spectra with well‐resolved spin orbit, multiplet and field splitting even powder samples mounted adhesive tape. Measurement of Cr 2 O 3 the latest generation spectrometers, which are able analyse non‐conductive powders ultimate energy resolution, revealed features satellite emission in 2p spectrum. Therefore, peak‐fit analysis Cr(III) compounds requires a more appropriate approach common practice has be reconsidered. One way this...
Spectacular skeletal rearrangement of the C76 fullerene cage was observed as a result chlorination D2-C76 to give C76Cl24 (see structure; gray C, green Cl, orange bonds highlight pentagons), which features significantly flattened carbon that violates isolated pentagon rule. This transformation is likely include seven single Stone–Wales rearrangements, are facilitated by cage. Detailed facts importance specialist readers published ”Supporting Information”. Such documents peer-reviewed, but...
Abstract In this paper, recent developments in the field of catalysts based on nanosized metal fluorides are presented with special focus exciting and promising magnesium fluoride systems. The majority these new catalyst systems originate from work authors fluorolytic sol–gel synthesis fluorides, which was developed by group. They selected a way as to highlight principles prospects approach high‐surface‐area, strongly distorted fluorides. This route opens, opinion authors, very broad range...
Magnesium fluoride sols for the wet chemical processing of porous MgF2 antireflective coatings were prepared by reaction MgCl2 with HF. The formation and crystallisation nanoparticles followed 19F NMR spectroscopy, X-ray diffraction (XRD) dynamic light scattering (DLS) in liquid phase. crystallization resulting films was monitored XRD experiments. At temperatures exceeding 550 °C film material glass substrates undergo a reaction, MgO is formed SiF4 evaporates as volatile product....
This review article focuses on the mechanism of non-aqueous fluorolytic sol gel-synthesis nanoscopic metal fluorides and hydroxide fluorides. Based MAS-NMR, XRD, WAXS SAXS investigations in combination with computational calculations, it is shown that a stepwise replacement alkoxide by F-ions takes place resulting formation large variety fluoride clusters, some them being isolated structurally characterised. It these obtained via this new synthesis approach exhibit distinctly different...