Search results for: Wiesław Łasocha

Items from 1 to 20 out of 41 results

article

Non‐invasive surface analysis of ancient bronze arrowheads with scanning electron microscopy and X‐ray powder diffractometry

Michał Duda, Marcin Oszajca, Wiesław Łasocha

Surface and Interface Analysis > 54 > 8 > 873 - 880

In this research, surfaces of eight ancient metal arrowheads were investigated regarding chemical composition, homogeneity, and products of corrosion. To perform that, two nondestructive techniques were applied: Scanning electron microscopy coupled with energy dispersive spectroscopy (SEM‐EDS), and X‐ray powder diffractometry (XRPD). Importantly, both methods did not require sampling, cutting, nor...

article

Ionic ammonium and anilinium based polymolybdate hybrid catalysts for olefin epoxidation

Barbara Bożek, Patrícia Neves, Wiesław Łasocha, Anabela A. Valente

Applied Catalysis A: General > 2018 > 564 > C > 13-25

Ionic polymolybdate hybrids (IPH) are interesting catalysts for liquid phase olefin epoxidation with tert-butylhydroperoxide; (tbhp), e.g. conversion of terpenic and fatty acid methyl ester (FAME) components of biomass to useful bio-products. IPHs may be easily prepared, under clean, mild, aqueous phase conditions. The type of organic precursor and the synthesis conditions influence the structural...

article

Physicochemical characterization of mineral deposits in human ligamenta flava

Sylwia Orzechowska, Andrzej Wróbel, Marcin Kozieł, Wiesław Łasocha, more

Journal of Bone and Mineral Metabolism > 2018 > 36 > 3 > 314-322

The aim of our study was the detailed characterization of calcium deposits in ligamenta flava. The use of microcomputed tomography allowed extending the routine medical investigations to characterize mineral grains in the microscopic scale. A possible connection between spinal stenosis and ligament mineralization was investigated. The studies were carried out on 24 surgically removed ligamentum flavum...

article

Synthesis, crystal structure and selected properties of a group of new peroxomolybdates

Adrianna Sławińska, Paweł Serda, Katarzyna Pamin, Jan Połtowicz, more

Polyhedron > 2017 > 121 > C > 191-198

A group of 5 new peroxomolybdates was synthesized and characterized. All the compounds belong to the group of oxidodiperoxidomolybdenum compounds, with a pyridine carboxylic acid N-oxide moiety coordinating the Mo atoms. They were investigated using single crystal or powder X-ray diffraction techniques. The obtained compounds were additionally characterized by IR spectroscopy and their thermal stability...

article

Molybdenum Complexes as Catalysts for the Oxidation of Cycloalkanes with Molecular Oxygen

Anna Szymańska, Wojciech Nitek, Marcin Oszajca, Wiesław Łasocha, more

Catalysis Letters > 2016 > 146 > 5 > 998-1010

A group of new polymolybdates was synthesized and tested in the catalytic oxidation of cycloalkanes. Investigated compounds exhibit broad structural diversity including polymolybdates with isolated anionic clusters (0-dim), polymeric anions (1-dim), Mo–O layers (2-dim) as well as hexagonal and orthorhombic molybdenum oxides (3-dim). All studied molybdenum complexes were found to be active in the reaction...

article

Crystal structures of 1,8‐bis(dimethylamino)naphthalene (DMAN) and dicarboxylic acids complexes determined from single‐crystal and powder diffraction data

Marcin Oszajca, Wojciech Nitek, Alicja Rafalska‐Łasocha, Wiesław Łasocha

Crystal Research and Technology > 50 > 9-10 > 781 - 790

New complexes of DMAN proton sponge with 3 dicarboxylic acids (dca): glutaric {1}, suberic {2} and dodecanedioic acid {3} were obtained. The structures of the complexes {1,2} were solved on the basis of laboratory powder data, while the structure of {3} was solved using single crystal methods. The additional goal of the study was to test some new approaches to organic crystal structure solution from...

article

Fine refinement of solid state structure of racemic form of phospho-tyrosine employing NMR Crystallography approach

Piotr Paluch, Tomasz Pawlak, Marcin Oszajca, Wieslaw Lasocha, more

Solid State Nuclear Magnetic Resonance > 2015 > 65 > C > 2-11

We present step by step facets important in NMR Crystallography strategy employing O-phospho-dl-tyrosine as model sample. The significance of three major techniques being components of this approach: solid state NMR (SS NMR), X-ray diffraction of powdered sample (PXRD) and theoretical calculations (Gauge Invariant Projector Augmented Wave; GIPAW) is discussed. Each experimental technique provides...

article

Pieczęcie z Czermna (Grody Czerwieńskie, Polska wschodnia) - rezultaty analiz chemicznych i metalurgicznych

Marcin Wołoszyn, Elżbieta M. Nosek, Janusz Stępiński, Alicja Rafalska-Łasocha, more

Archeologia Polski > 2015 > 60 > 123-152

The paper reports on the results of chemical analysis and metallography examination of four lead seals from Czermno (Cherven towns region). The seals were issued by Rus dukes and have been dated to 12th-13th centuries. Selected specimens were subjected to detailed observations under SEM (Scanning Electron Microscope). Chemical analysis included EDS (Energy Dispersive X-Ray Spectroscopy) and EDXRF...

article

Unusual adsorption behavior of volatile hydrocarbons on MOF-5 studied using thermodesorption methods

Wacław Makowski, Maria Mańko, Piotr Zabierowski, Kinga Mlekodaj, more

Thermochimica Acta > 2014 > 587 > Complete > 1-10

Adsorption of n-alkanes (C ₅ –C ₁₀ ), isooctane, benzene, toluene and p-xylene on MOF-5 was studied by means of quasi-equilibrated temperature programmed desorption and adsorption (QE-TPDA) and temperature programmed desorption (TPD). Unusual thermodesorption profiles showing increasing complexity with the size of a probe molecule have been observed. Number of peaks in the thermodesorption...

article

Preparation, structural characterization, and decomposition studies of two new γ-octamolybdates of 4-methylpyridine

Anna Szymańska, Wojciech Nitek, Dorota Rutkowska-Zbik, Wiesław Łasocha

Monatshefte für Chemie - Chemical Monthly > 2014 > 145 > 6 > 921-929

We synthesized two new γ-octamolybdates, and determined their crystal structures from single-crystal X-ray diffraction data. Orange-yellow tetrakis(4-methylpyridinium) bis(4-methylpyridine)-γ-octamolybdate 1 crystallizes in space group P2₁/c with a = 11.586(2) Å, b = 15.526(2) Å, c = 16.247(2) Å, β = 118.753(1)º, Z = 2. White tetrakis(4-methylpyridinium) bis(4-methylpyridine)-γ-octamolybdate hydrate...

article

Bis(4‐methylanilinium) and bis(4‐iodoanilinium) pentamolybdates from laboratory X‐ray powder data and total energy minimization

Marcin Oszajca, Ľubomír Smrčok, Wiesław Łasocha

Acta Crystallographica Section C > 69 > 11 > 1367 - 1372

The crystal structures of poly[bis(4‐methylanilinium) [tetra‐μ₃‐oxido‐hexa‐μ₂‐oxido‐hexaoxidopentamolybdenum(VI)]], {(C₇H₁₀N)₂[Mo₅O₁₆]}_n, (I), and poly[bis(4‐iodoanilinium) [tetra‐μ₃‐oxido‐hexa‐μ₂‐oxido‐hexaoxidopentamolybdenum(VI)]], {(C₆H₇IN)₂[Mo₅O₁₆]}_n, (II), were determined from laboratory X‐ray powder diffraction data using the direct‐space parallel‐tempering approach and refined by total energy...

article

Synthesis and Characterization of Pillared Metal Sulfates (Diamine)MeSO₄, (Me = Zn, Cd)

Katarzyna Luberda‐Durnaś, Dariusz Mucha, Paula Sanz‐Camacho, Wiesław Łasocha

Zeitschrift für anorganische und allgemeine Chemie > 639 > 12‐13 > 2195 - 2201

Hybrid organic‐inorganic materials of the type (diamine)MeSO₄ (Me = Cd, Zn) [diamine = p‐xylylenediamine (PXDA) or m‐xylylenediamine (MXDA)] have not been described in the literature to date. Four compounds of this type, namely, (MXDA)ZnSO₄ (1), (MXDA)CdSO₄ (2), (PXDA)ZnSO₄ (3), and (PXDA)CdSO₄ (4), were synthesized by solvothermal methods. Since all compounds crystallized as very fine powders, crystal...

article

Structural studies and physico-chemical properties of new oxodiperoxomolybdenum complexes with nicotinic acid

Anna Szymańska, Wojciech Nitek, Dariusz Mucha, Robert Karcz, more

Polyhedron > 2013 > 60 > Complete > 39-46

Three new oxodiperoxomolybdenum complexes with nicotinic acid have been synthesized and characterized with the use of single-crystal analysis, XRPD versus temperature, TG/DSC, SEM and IR spectroscopy. The investigated compounds are: 1 – (NH ₄ ) ₂ ·[MoO(O ₂ ) ₂ .N-nicO] ₂ , 2 – (nicH) ₂ ·[MoO(O ₂ ) ₂ .N-nicO] ₂ ·2(H ₂ O),...

article

Synthesis and structure determination of tetrakis(4-iodoanilinum) β-octamolybdate dihydrate

Marcin Oszajca, Ľubomír Smrčok, Helena Pálková, Wiesław Łasocha

Journal of Molecular Structure > 2012 > 1021 > Complete > 70-75

Tetrakis(4-iodoanilinum) β-octamolybdate dihydrate (I) was synthesized and its structure was solved using powder diffraction methods and the atoms positions optimized by the solid state DFT calculations. The structure is triclinic (P-1) with cell parameters: a=9.7099(4)Å, b=9.8169(3)Å, c=14.9842(6)Å, α=97.349(3)°, β=102.989(3)°, γ=113.335(3)°, V=1239.79Å ³ . The anion type was determined based...

article

Insight into coordination of dilead unit by molecules of 4-thiazolidinone-2-thione: Structural and computational studies

Katarzyna M. Marzec, Bartlomiej Gawel, Krzysztof K. Zborowski, Wieslaw Lasocha, more

Inorganica Chimica Acta > 2011 > 376 > 1 > 581-589

The reaction of Pb ²⁺ ions with 4-thiazolidinone-2-thione (Hrd) yields to coordination of the uncommon dilead unit (Pb ₂ ²⁺ ) by the N-deprotonated molecule of the ligand. The powder structure determination of the complex reveals an almost planar dimeric structure with the {N,S} coordination mode. The intermolecular distance of the Pb–Pb moiety (3.51(4)Å) is lower than the van...

article

Humidity-Driven Reversible Transformation and Guest Inclusion in a Two-Dimensional Coordination Framework Tailored by Organic Polyamine Cation

Robert Podgajny, Szymon Choraży, Wojciech Nitek, Andrzej Budziak, more

Crystal Growth & Design > 2011 > 11 > 9 > 3866 - 3876

article

Rücktitelbild: Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement (Angew. Chem. 17/2011)

Dawid Pinkowicz, Robert Podgajny, Bartłomiej Gaweł, Wojciech Nitek, more

Angewandte Chemie > 123 > 17 > 3902 - 3902

Das reversible Entfernen von Gastmolekülen in magnetischen Mn₂Nb‐Koordinationspolymeren, über das D. Pinkowicz, B. Sieklucka et al. in der Zuschrift auf S. 4059 ff. berichten, bewirkt eine zweistufige Umlagerung des Gerüsts unter topotaktischer Bildung einer weiteren molekularen Brücke und Verschiebung des eingebauten organischen Liganden. Im Zuge dieser Strukturänderungen lässt sich die Curie‐Temperatur...

article

Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement

Dawid Pinkowicz, Robert Podgajny, Bartłomiej Gaweł, Wojciech Nitek, more

Angewandte Chemie > 123 > 17 > 4059 - 4063

Auf den Stufen zum Olymp: Ein Mn₂Nb‐Koordinationsnetzwerk zeigt ein ausgeprägtes Schalten der Curie‐Temperatur mit zwei wohldefinierten Stufen, wobei in der wasserfreien Form 100 K erreicht werden. Das durch das Entfernen/Aufnehmen von Gastmolekülen gesteuerte Schalten geht mit einer Gerüstumlagerung durch reversible Bildung/Spaltung von molekularen Brücken und Translokation eines organischen Liganden...

article

Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement

Dawid Pinkowicz, Robert Podgajny, Bartłomiej Gaweł, Wojciech Nitek, more

Angewandte Chemie International Edition > 50 > 17 > 3973 - 3977

Stairway to heaven: An Mn₂Nb coordination framework shows huge switching of the magnetic ordering temperature in two well‐defined steps, finally reaching 100 K in its anhydrous form. The switching, controlled by removal/uptake of guest molecules, is related to an intraskeletal molecular rearrangement involving reversible formation/breaking of molecular bridges and translocation of an organic ligand...

article

Back Cover: Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement (Angew. Chem. Int. Ed. 17/2011)

Dawid Pinkowicz, Robert Podgajny, Bartłomiej Gaweł, Wojciech Nitek, more

Angewandte Chemie International Edition > 50 > 17 > 3818 - 3818

The reversible removal of guest molecules in Mn₂Nb magnetic coordination framework materials, as described by D. Pinkowicz, B. Sieklucka et al. in their Communication on page 3973 ff., causes a spectacular two‐step molecular rearrangement of their skeleton involving the topotactic formation of an additional molecular bridge and the translocation of the incorporated organic ligand. These structural...

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INFONA - science communication portal

Search results for: Wiesław Łasocha

Non‐invasive surface analysis of ancient bronze arrowheads with scanning electron microscopy and X‐ray powder diffractometry

Ionic ammonium and anilinium based polymolybdate hybrid catalysts for olefin epoxidation

Physicochemical characterization of mineral deposits in human ligamenta flava

Synthesis, crystal structure and selected properties of a group of new peroxomolybdates

Molybdenum Complexes as Catalysts for the Oxidation of Cycloalkanes with Molecular Oxygen

Crystal structures of 1,8‐bis(dimethylamino)naphthalene (DMAN) and dicarboxylic acids complexes determined from single‐crystal and powder diffraction data

Fine refinement of solid state structure of racemic form of phospho-tyrosine employing NMR Crystallography approach

Pieczęcie z Czermna (Grody Czerwieńskie, Polska wschodnia) - rezultaty analiz chemicznych i metalurgicznych

Unusual adsorption behavior of volatile hydrocarbons on MOF-5 studied using thermodesorption methods

Preparation, structural characterization, and decomposition studies of two new γ-octamolybdates of 4-methylpyridine

Bis(4‐methylanilinium) and bis(4‐iodoanilinium) pentamolybdates from laboratory X‐ray powder data and total energy minimization

Synthesis and Characterization of Pillared Metal Sulfates (Diamine)MeSO₄, (Me = Zn, Cd)

Structural studies and physico-chemical properties of new oxodiperoxomolybdenum complexes with nicotinic acid

Synthesis and structure determination of tetrakis(4-iodoanilinum) β-octamolybdate dihydrate

Insight into coordination of dilead unit by molecules of 4-thiazolidinone-2-thione: Structural and computational studies

Humidity-Driven Reversible Transformation and Guest Inclusion in a Two-Dimensional Coordination Framework Tailored by Organic Polyamine Cation

Rücktitelbild: Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement (Angew. Chem. 17/2011)

Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement

Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement

Back Cover: Double Switching of a Magnetic Coordination Framework through Intraskeletal Molecular Rearrangement (Angew. Chem. Int. Ed. 17/2011)

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