Michael A. Hayward

artykuł

Disproportionation of Co²⁺ in the Topochemically Reduced Oxide LaSrCoRuO₅

Zhilin Liang, Maria Batuk, Fabio Orlandi, Pascal Manuel, więcej

Angewandte Chemie International Edition > 63 > 6 > n/a - n/a

Complex transition‐metal oxides exhibit a wide variety of chemical and physical properties which are a strong function the local electronic states of the transition‐metal centres, as determined by a combination of metal oxidation state and local coordination environment. Topochemical reduction of the double perovskite oxide, LaSrCoRuO₆, using Zr, yields LaSrCoRuO₅. This reduced phase contains an ordered...

artykuł

Disproportionation of Co²⁺ in the Topochemically Reduced Oxide LaSrCoRuO₅

Zhilin Liang, Maria Batuk, Fabio Orlandi, Pascal Manuel, więcej

Angewandte Chemie > 136 > 6 > n/a - n/a

Complex transition‐metal oxides exhibit a wide variety of chemical and physical properties which are a strong function the local electronic states of the transition‐metal centres, as determined by a combination of metal oxidation state and local coordination environment. Topochemical reduction of the double perovskite oxide, LaSrCoRuO₆, using Zr, yields LaSrCoRuO₅. This reduced phase contains an ordered...

artykuł

A Structurally Characterized Cobalt(I) σ‐Alkane Complex

Timothy M. Boyd, Bengt E. Tegner, Graham J. Tizzard, Antonio J. Martínez‐Martínez, więcej

Angewandte Chemie International Edition > 59 > 15 > 6177 - 6181

A cobalt σ‐alkane complex, [Co(Cy₂P(CH₂)₄PCy₂)(norbornane)][BAr^F₄], was synthesized by a single‐crystal to single‐crystal solid/gas hydrogenation from a norbornadiene precursor, and its structure was determined by X‐ray crystallography. Magnetic data show this complex to be a triplet. Periodic DFT and electronic structure analyses revealed weak C−H→Co σ‐interactions, augmented by dispersive stabilization...

artykuł

Rücktitelbild: A Structurally Characterized Cobalt(I) σ‐Alkane Complex (Angew. Chem. 15/2020)

Timothy M. Boyd, Bengt E. Tegner, Graham J. Tizzard, Antonio J. Martínez‐Martínez, więcej

Angewandte Chemie > 132 > 15 > 6349 - 6349

Ein Cobalt/Norbornan‐σ‐Alkan‐Komplex wird durch eine Einkristall‐zu‐Einkristall‐Hydrierung aus einem Norbornadien‐Vorläufer synthetisiert, wie S. A. Macgregor, A. S. Weller et al. in ihrer Zuschrift auf S. 6236 beschreiben. Das Titelbild zeigt diesen σ‐Alkan‐Komplex in seinem Anionenkäfig, dargestellt als Van‐der‐Waals‐Oberfläche. Die nichtkovalenten Wechselwirkungen mit dem Anionenkäfig sind für...

artykuł

A Structurally Characterized Cobalt(I) σ‐Alkane Complex

Timothy M. Boyd, Bengt E. Tegner, Graham J. Tizzard, Antonio J. Martínez‐Martínez, więcej

Angewandte Chemie > 132 > 15 > 6236 - 6240

A cobalt σ‐alkane complex, [Co(Cy₂P(CH₂)₄PCy₂)(norbornane)][BAr^F₄], was synthesized by a single‐crystal to single‐crystal solid/gas hydrogenation from a norbornadiene precursor, and its structure was determined by X‐ray crystallography. Magnetic data show this complex to be a triplet. Periodic DFT and electronic structure analyses revealed weak C−H→Co σ‐interactions, augmented by dispersive stabilization...

artykuł

Back Cover: A Structurally Characterized Cobalt(I) σ‐Alkane Complex (Angew. Chem. Int. Ed. 15/2020)

Timothy M. Boyd, Bengt E. Tegner, Graham J. Tizzard, Antonio J. Martínez‐Martínez, więcej

Angewandte Chemie International Edition > 59 > 15 > 6290 - 6290

A cobalt norbornane σ‐alkane complex was synthesized by a single‐crystal to single‐crystal solid/gas hydrogenation from a norbornadiene precursor, as described by S. A. Macgregor, A. S. Weller et al. in their Communication on page 6177. The cover picture shows the title cobalt σ‐alkane complex within its anion cage, with the van der Waals surface highlighted. The non‐covalent interactions provided...

artykuł

Hole and Electron Doping of the 4d Transition‐Metal Oxyhydride LaSr₃NiRuO₄H₄

Lun Jin, Michael A. Hayward

Angewandte Chemie International Edition > 59 > 5 > 2076 - 2079

Hole or electron doping of phases prepared by topochemical reactions (e.g. anion deintercalation or anion‐exchange) is extremely challenging as these low‐temperature conversion reactions are typically very sensitive to the electron counts of precursor phases. Herein we report the successful hole and electron doping of the transition‐metal oxyhydride LaSr₃NiRuO₄H₄ by first preparing precursors in the...

artykuł

Hole and Electron Doping of the 4d Transition‐Metal Oxyhydride LaSr₃NiRuO₄H₄

Lun Jin, Michael A. Hayward

Angewandte Chemie > 132 > 5 > 2092 - 2095

Hole or electron doping of phases prepared by topochemical reactions (e.g. anion deintercalation or anion‐exchange) is extremely challenging as these low‐temperature conversion reactions are typically very sensitive to the electron counts of precursor phases. Herein we report the successful hole and electron doping of the transition‐metal oxyhydride LaSr₃NiRuO₄H₄ by first preparing precursors in the...

artykuł

LaSr₃NiRuO₄H₄: A 4d Transition‐Metal Oxide–Hydride Containing Metal Hydride Sheets

Lun Jin, Michael Lane, Dihao Zeng, Franziska K. K. Kirschner, więcej

Angewandte Chemie > 130 > 18 > 5119 - 5122

The synthesis of the first 4d transition metal oxide–hydride, LaSr₃NiRuO₄H₄, is prepared via topochemical anion exchange. Neutron diffraction data show that the hydride ions occupy the equatorial anion sites in the host lattice and as a result the Ru and Ni cations are located in a plane containing only hydride ligands, a unique structural feature with obvious parallels to the CuO₂ sheets present...

artykuł

LaSr₃NiRuO₄H₄: A 4d Transition‐Metal Oxide–Hydride Containing Metal Hydride Sheets

Lun Jin, Michael Lane, Dihao Zeng, Franziska K. K. Kirschner, więcej

Angewandte Chemie International Edition > 57 > 18 > 5025 - 5028

The synthesis of the first 4d transition metal oxide–hydride, LaSr₃NiRuO₄H₄, is prepared via topochemical anion exchange. Neutron diffraction data show that the hydride ions occupy the equatorial anion sites in the host lattice and as a result the Ru and Ni cations are located in a plane containing only hydride ligands, a unique structural feature with obvious parallels to the CuO₂ sheets present...

artykuł

Characterization of mechanosynthesized Bi1−xSmxFeO3 samples unencumbered by secondary phases or compositional inhomogeneity

Eva Gil-González, Antonio Perejón, Pedro E. Sánchez-Jiménez, Michael A. Hayward, więcej

Journal of Alloys and Compounds > 2017 > 711 > C > 541-551

High-quality samples, in terms of phase purity and dielectric properties, of composition Bi_1−xSm_xFeO₃ (0.05 ≤ x ≤ 0.20) have for the first time been prepared by mechanosynthesis. Close inspection of the powder diffraction data, analysis via Rietveld refinement and TEM microscopy demonstrates that the Bi_1−xSm_xFeO₃ samples contain only perovskite phases. Additionally, by a combination of Rietveld analysis,...

artykuł

Preparation of ytterbium substituted BiFeO3 multiferroics by mechanical activation

Eva Gil-González, Antonio Perejón, Pedro E. Sánchez-Jiménez, Michael A. Hayward, więcej

Journal of the European Ceramic Society > 2017 > 37 > 3 > 945-954

Samples in the system Bi_1−xYb_xFeO₃ (0.02≤×≤0.07) have for the first time been prepared by mechanical activation followed by sintering. XRD and DSC measurements show that the solubility limit of ytterbium in the R3c Bi_1−xYb_xFeO₃ system is reached at x∼0.03. Higher ytterbium contents lead to a two-phase mixture of a main R3c phase of approximate composition Bi_0.97Yb_0.03FeO₃ and ytterbium enriched secondary...

artykuł

“Ba6Nb4RuO18” and “LaBa4Nb3RuO15” – The structural consequences of substituting paramagnetic cations into AnBn−1O3n cation-deficient perovskite oxides

Elynor L. Kamil, Harry W.T. Morgan, Michael A. Hayward

Journal of Solid State Chemistry > 2016 > 238 > C > 267-272

The B-cation deficient perovskite phases Ba₆Nb₄RuO₁₈ and LaBa₄Nb₃RuO₁₅ were prepared by ceramic synthesis. Neutron powder diffraction analysis indicates that rather than the 6-layer and 5-layer cation-deficient perovskite structures expected for these phases (by analogy to the known structures of Ba₆Nb₄TiO₁₈ and LaBa₄Nb₃TiO₁₅) they adopt 5-layer and 4-layer B-cation deficient perovskite structures...

artykuł

Ca2Cr0.5Ga1.5O5—An extremely redox-stable brownmillerite phase

Kun Luo, Midori Amano Patino, Michael A. Hayward

Journal of Solid State Chemistry > 2015 > 222 > C > 71-75

Investigation of the Ca₂Cr_xGa_2−xO₅ compositional series reveals a maximum chromium solubility of 25%. The most chromium rich composition, Ca₂Cr_0.5Ga_1.5O₅, adopts a brownmillerite-type anion deficient perovskite structure described in space group Pnma (a=5.368Å, b=14.547Å, c=5.593Å). Neutron powder diffraction data reveals rigorous B-site cation order, with all of the tetrahedral coordination sites...

artykuł

Strontium Vanadium Oxide–Hydrides: “Square‐Planar” Two‐Electron Phases

Fabio Denis Romero, Alice Leach, Johannes S. Möller, Francesca Foronda, więcej

Angewandte Chemie > 126 > 29 > 7686 - 7689

A series of strontium vanadium oxide–hydride phases prepared by utilizing a low‐temperature synthesis strategy in which oxide ions in Sr_n+1V_nO_3n+1 (n=∞, 1, 2) phases are topochemically replaced by hydride ions to form SrVO₂H, Sr₂VO₃H, and Sr₃V₂O₅H₂, respectively. These new phases contain sheets or chains of apex‐linked V³⁺O₄ squares stacked with SrH layers/chains, such that the n=∞ member, SrVO₂H,...

artykuł

Strontium Vanadium Oxide–Hydrides: “Square‐Planar” Two‐Electron Phases

Fabio Denis Romero, Alice Leach, Johannes S. Möller, Francesca Foronda, więcej

Angewandte Chemie International Edition > 53 > 29 > 7556 - 7559

A series of strontium vanadium oxide–hydride phases prepared by utilizing a low‐temperature synthesis strategy in which oxide ions in Sr_n+1V_nO_3n+1 (n=∞, 1, 2) phases are topochemically replaced by hydride ions to form SrVO₂H, Sr₂VO₃H, and Sr₃V₂O₅H₂, respectively. These new phases contain sheets or chains of apex‐linked V³⁺O₄ squares stacked with SrH layers/chains, such that the n=∞ member, SrVO₂H,...

artykuł

The synthesis and characterisation of LaCa2Fe2GaO8

Kun Luo, Michael A. Hayward

Journal of Solid State Chemistry > 2013 > 198 > Complete > 203-209

The synthesis and characterisation of LaCa ₂ Fe ₂ GaO ₈ is described. Neutron powder diffraction data reveal LaCa ₂ Fe ₂ GaO ₈ adopts an anion-vacancy ordered, ‘triple layer’ structure consisting of an OOT _L OOT _R stacking sequence of layers of (Fe/Ga)O ₆ octahedra (O) and (Fe/Ga)O ₄ tetrahedra (T), related to that of...

artykuł

Mn(I) in an Extended Oxide: The Synthesis and Characterization of La _{1– x} Ca _x MnO _2+δ (0.6 ≤ x ≤ 1)

Edward Dixon, Joke Hadermann, Silvia Ramos, Andrew L. Goodwin, więcej

Journal of the American Chemical Society > 2011 > 133 > 45 > 18397 - 18405

artykuł

“A” Cation Polarity Control in ACuTe ₂ O ₇ (A = Sr ²⁺ , Ba ²⁺ , or Pb ²⁺ )

Jeongho Yeon, Sang-Hwan Kim, Michael A. Hayward, P. Shiv Halasyamani

Inorganic Chemistry > 2011 > 50 > 17 > 8663 - 8670

artykuł

Suppression of Magnetic Order in Sr ₃ Fe ₂ O ₄ Cl ₂ by Fe-Site Substitution by Cobalt

Edward Dixon, Michael A. Hayward

Inorganic Chemistry > 2011 > 50 > 15 > 7250 - 7256

INFONA - portal komunikacji naukowej

Wyniki wyszukiwania dla: Michael A. Hayward

Disproportionation of Co²⁺ in the Topochemically Reduced Oxide LaSrCoRuO₅

Disproportionation of Co²⁺ in the Topochemically Reduced Oxide LaSrCoRuO₅

A Structurally Characterized Cobalt(I) σ‐Alkane Complex

Rücktitelbild: A Structurally Characterized Cobalt(I) σ‐Alkane Complex (Angew. Chem. 15/2020)

A Structurally Characterized Cobalt(I) σ‐Alkane Complex

Back Cover: A Structurally Characterized Cobalt(I) σ‐Alkane Complex (Angew. Chem. Int. Ed. 15/2020)

Hole and Electron Doping of the 4d Transition‐Metal Oxyhydride LaSr₃NiRuO₄H₄

Hole and Electron Doping of the 4d Transition‐Metal Oxyhydride LaSr₃NiRuO₄H₄

LaSr₃NiRuO₄H₄: A 4d Transition‐Metal Oxide–Hydride Containing Metal Hydride Sheets

LaSr₃NiRuO₄H₄: A 4d Transition‐Metal Oxide–Hydride Containing Metal Hydride Sheets

Characterization of mechanosynthesized Bi1−xSmxFeO3 samples unencumbered by secondary phases or compositional inhomogeneity

Preparation of ytterbium substituted BiFeO3 multiferroics by mechanical activation

“Ba6Nb4RuO18” and “LaBa4Nb3RuO15” – The structural consequences of substituting paramagnetic cations into AnBn−1O3n cation-deficient perovskite oxides

Ca2Cr0.5Ga1.5O5—An extremely redox-stable brownmillerite phase

Strontium Vanadium Oxide–Hydrides: “Square‐Planar” Two‐Electron Phases

Strontium Vanadium Oxide–Hydrides: “Square‐Planar” Two‐Electron Phases

The synthesis and characterisation of LaCa2Fe2GaO8

Mn(I) in an Extended Oxide: The Synthesis and Characterization of La _{1– x} Ca _x MnO _2+δ (0.6 ≤ x ≤ 1)

“A” Cation Polarity Control in ACuTe ₂ O ₇ (A = Sr ²⁺ , Ba ²⁺ , or Pb ²⁺ )

Suppression of Magnetic Order in Sr ₃ Fe ₂ O ₄ Cl ₂ by Fe-Site Substitution by Cobalt

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