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11 citations found for Matsubayashi,

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An in situ XAFS cell was developed and used for the structural analysis of a Rh ion-exchanged zeolite catalyst during high-pressure hydrogenation of carbon dioxide. The in situ cell enabled analyses of the catalyst structures that changed with the reaction atmosphere and elapsed time; the peak assigned to Rh-O scattering changed to that assigned to Rh-Rh scattering at 404 K during the pretreatment by hydrogen. After 30 min of the carbon dioxide hydrogenation reaction, the peak intensity assigned to Rh-Rh scattering increased corresponding to the increase in the catalytic activity.

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The previously unknown form of the magnesium dichloride hydrate series, MgCl2·10H2O, is discovered under high pressure. The structures of this newly found compound and its deuterated counterpart are solved by in-situ powder synchrotron X-ray and spallation neutron diffraction.

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The title compound comprises a central [2,3,9,10,16,17,23,24-octa­kis­(2,6-di­methyl­phen­oxy)phthalocyaninato]zinc(II) unit, sandwiched between two [(5,10,15,20-tetra­phenyl­porphyrinato)]zinc(II) units, exhibiting a nearly H-type aggregate.


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The goal of the present study was to elucidate the formation mechanisms of highly dispersed catalysts by the molten salt method. For this purpose, multi-component fitting Mo K-edge EXAFS analysis was applied to the structure of molybdate catalysts prepared in KNO3 and NaNO3. The analysis revealed that MoO3 dissolved in molten salts was at first transformed into polymolybdate anions and finally into MoO42- anions. The transformation into MoO42- anions took place at a lower temperature when NaNO3 was used as molten salt than KNO3. In contrast, polymolybdate anions were stable even at higher temperature when ZrO2 was added as a support of molybdate.


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Ta2NiSe5 has recently attracted interest as an excitonic insulator. In this paper, crystallographic parameters of three non-ambient phases are reported from across the PT phase diagram. A reversible pressure-induced structural transition above 3 GPa is associated with the coherent sliding of weakly coupled layers.


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Crystals of [Ru(C10H8N2)3]2[Co(CN)6]Cl.8H2O (C10H8N2 = bpy = 2,2'-bipyridine) which belong to the space group C2 were characterized by two `pseudo-racemic' crystallographically independent [Ru(bpy)3]2+ cations. Three kinds of layers are found in the crystal structure: (i) the layer consisting of the [Lambda]-[Ru(bpy)3]2+ cations. Three kinds of layers are found in the crystal structure: (i) a layer consisting of [Delta]-[Ru(bpy)3]2+ cations and water molecules; (ii) a layer of [Co(CN)6]3- and Cl- anions and water molecules; (iii) a layer of [Delta]-[Ru(bpy)3]2+ cations and water molecules. The layers are stacked in the order (i), (ii), (iii) and (ii) almost perpendicularly to the c axis. Some O...O, O...N(cyano) and O...Cl hydrogen bonds construct networks within and between the layers.

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Synchronous scanning of the undulator gap and a monochromator was done to obtain smooth profiles of incident x-rays that are suitable for XAFS measurements. By changing the gap from 150 mm (B=0.12 T) to 140 mm (B=0.15 T) with the use of the 3rd to 11th harmonic peaks, soft x-rays with energy from 200 eV to1200 eV were obtained. The smooth profile of the incident x-rays provided high-quality measurement of XANES and EXAFS spectra in the soft x-ray region. Issues that would improve the synchronous scanning system are discussed.

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The effect of nitrilotriacetic acid (NTA) as a complexing agent on the sulfidation mechanisms of Co-Mo catalysts supported on activated carbon and alumina was examined by the XAFS technique. The XAFS results revealed that NTA interacted with Co atoms and formed the Co-NTA interaction, while it showed almost no influence on the local structures around Mo atoms. The Co-NTA interaction suppressed the aggregation of cobalt atoms and the interaction between cobalt and alumina during sulfiding, and consequently promoted the formation of the Co-Mo-S phase.

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