A5035429818- Crystallization and Solubility Studies
- Inorganic Fluorides and Related Compounds
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Inorganic Chemistry and Materials
- Fluorine in Organic Chemistry
- Magnetism in coordination complexes
- Metal-Organic Frameworks: Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Advanced Chemical Physics Studies
- Solid-state spectroscopy and crystallography
- Silicone and Siloxane Chemistry
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Crystallography and molecular interactions
- Graphene research and applications
- Fullerene Chemistry and Applications
- Methane Hydrates and Related Phenomena
- Ammonia Synthesis and Nitrogen Reduction
- High-pressure geophysics and materials
- Fiber-reinforced polymer composites
- Chemical Synthesis and Characterization
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Thermal Expansion and Ionic Conductivity
Jožef Stefan Institute
2016-2025
University of Warsaw
2010-2023
Jožef Stefan International Postgraduate School
2005-2009
John Snow (United States)
2006
Colorado State University
2006
Kyoto University
2006
The parent compound of high-[Formula: see text] superconducting cuprates is a unique Mott insulator consisting layers spin-[Formula: ions forming square lattice and with record high in-plane antiferromagnetic coupling. Compounds similar characteristics have long been searched for without success. Here, we use combination experimental theoretical tools to show that commercial [Formula: an excellent cuprate analog remarkably electronic parameters but larger buckling planes. Two-magnon Raman...
Fluoroacid-base reactions of a room-temperature ionic liquid, 1-ethyl-3-methylimidazolium fluorohydrogenate (EMIm(HF)2.3F, EMIm = cation), and Lewis fluoroacids (BF3, PF5, AsF5, NbF5, TaF5 WF6) give salts the corresponding fluorocomplex anions, EMImBF4, EMImPF6, EMImAsF6, EMImNbF6, EMImTaF6 EMImWF7, respectively. Attempts to prepare EMImVF6 by both acid-base reaction EMIm(HF)2.3F with VF5 metathesis EMImCl KVF6 failed due strong oxidizing power pentavalent vanadium, whereas EMImSbF6 was...
Silver is the heavier congener of copper in Periodic Table, but chemistry these two elements very different. While Cu(II) most common cationic form copper, Ag(II) rare and its compounds exhibit a broad range peculiar physico-chemical properties. These include, are not limited to: (i) uncommon oxidizing properties, (ii) unprecedented large mixing metal ligand valence orbitals, (iii) strong spin-polarization neighbouring ligands, (iv) record magnetic superexchange constants, (v) ease thermal...
Black AgSO4, synthesized for the first time by a displacement reaction, differs considerably from anhydrous sulfates of its Group 11 congeners: it has very small electronic band gap (ca. 0.2 eV) and an anomalously strong one-dimensional antiferromagnetic ordering ( J≈10 meV per Ag), which persists up to onset thermal decomposition at about 120 °C. Ag gray, O red, S yellow. The chemistry coinage metals is rich surprising, considerable differences are found between copper, silver, gold.1 Among...
Unconventional covalence: For the higher silver fluorides silver–fluorine chemical bonding is significantly covalent, in contrast to conventional "ionic" picture most frequently used chemistry of inorganic fluorides. KAgF4, an Ag(III) fluoride, Ag(4d) states (see picture) are more within "ligand band" (60 %) than "metal (40 reflecting significant covalency AgF bond, and electronic band with hole production anionic F(2p) states.
Crystal structure and magnetic properties of K2AgF4, related to recently studied Cs2AgF4, have been scrutinized. It crystallizes orthorhombic (Cmca No.64) with a = 6.182(3) Å, b 12.632(5) c 6.436(3) Å (Z 4, V 502.6(7) Å3). K2AgF4 exhibits slightly puckered [AgF2] sheets compressed octahedral coordination Ag(II) it is not isostructural Cs2AgF4. Violet–coloured orders ferromagnetically below 26 K. The DFT calculations reproduce semiconducting ferromagnetism at the LSDA + U level but only if...
We demonstrate that the intrinsic electron doping of monolayer epitaxial graphene on SiC(0001) can be tuned in a controlled fashion to holes via molecular with fluorinated fullerene C60F48. In situ angle-resolved photoemission is used measure an upward shift (0.6 ± 0.05) eV Dirac point from −0.43 +0.17 relative Fermi level. The carrier density observed change n ∼ (1 × 1013 0.1 1013) cm−2 p (2 1012 1 1012) cm−2. introduce model employing Fermi-Dirac statistics which explicitly takes...
High-purity samples of potassium trifluoroargentate(II), KAgF3, have been obtained via a novel synthetic pathway. This compound is found to exhibit an order–disorder phase transition around 230 K. Susceptibility measurements indicate that KAgF3 exhibits strong antiferromagnetic (AFM) coupling reminiscent in copper(II) oxides.
A combined experimental–theoretical study of silver(I) and silver(II) fluorides under high pressure is reported. For AgI, the CsCl-type structure stable to at least 39 GPa; overtone IR-active mode seen in Raman spectrum. Its AgIIF2 sibling a unique compound many ways: it more covalent than other known difluorides, crystallizes layered structure, enormously reactive. Using X-ray diffraction guided by theoretical calculations (density functional theory), we have been able elucidate crystal...
Trifluoromethansulfonate of silver(I), AgSO(3)CF(3) (abbreviated AgOTf), extensively used in organic chemistry, and its fluorosulfate homologue, AgSO(3)F, have been structurally characterized for the first time. The crystal structures both homologues differ substantially from each other. AgOTf crystallizes a hexagonal system (R3 space group, No.148) with = b 5.312(3) Å c 32.66(2) Å, while AgSO(3)F monoclinic centrosymmetric P2(1)/m group (No.11) 5.4128(10) 8.1739(14) 7.5436(17) β...
Charge-transfer insulators are the parent phase of a large group today's unconventional high-temperature superconductors. Here we study experimentally and theoretically interband excitations charge-transfer insulator silver fluoride ${\mathrm{AgF}}_{2}$, which has been proposed as an excellent analog oxocuprates. Optical conductivity resonant inelastic x-ray scattering on ${\mathrm{AgF}}_{2}$ polycrystalline sample show close similarity with that measured undoped...
The increase in the size of monocations (A+) does not favor formation [Ti2F9]− against [Ti4F18]2− salts (with isolated or anions, respectively) as previously proposed (Passmore, J.; et al. Angew. Chem., Int. Ed. 2005, 44, 7958−7961). crystal structure determination [Me4N]+ and [Ph4P]+ showed that both compounds are salts; i.e., [Me4N]2[Ti4F18] [Ph4P]2[Ti4F18] were obtained instead [Me4N][Ti2F9] [Ph4P][Ti2F9]. product reaction CsF with 2TiF4 could be formulated CsTi2F9; however, infinite...
Reactions between imidazole (Im, C3H4N2) and TiF4 in anhydrous hydrogen fluoride (aHF) different molar ratios have yielded [ImH]2[TiF6]·2HF, [ImH]3[Ti2F11], [ImH]4[Ti4F20], [ImH]3[Ti5F23], [ImH][Ti2F9] upon crystallization. All five structures were characterized by low-temperature single-crystal X-ray diffraction. The Raman spectra of also recorded assigned. In the crystal structure two HF molecules are coordinated to each [TiF6](2-) anion means strong F-H···F bonds. [Ti2F11](3-)...
At a pressure of ca. 15 GPa, AgF2 transforms to an unprecedented orthorhombic polymorph featuring array tubular subunits which are built corner sharing [AgF4] squares. This seems be the first type metal fluoride nanowire and also only one showing rigid square planar rather than common hexagonal or octahedral moieties.
Ag<sub>3</sub>(SbF<sub>6</sub>)<sub>4</sub>is a mixed valence ternary compound of silver with random distribution Ag(<sc>i</sc>) and Ag(<sc>ii</sc>) cations, the first its kind.
DFT calculations and Raman spectroscopy measurements indicate that pressure induces in Na 2 CuF 4 a phase transition from variants of the Sr PbO post-perovskite structure to novel Th 3 P -like polymorph whose properties closely mimic those Mg SiO .