scholarly journals Effects of Sulfate Ion on Crystal Structure and Activity for Methane Oxidation of Iron Oxide Prepared from Goethite.

2002 ◽  
pp. 11-18 ◽  
Author(s):  
Masanao ORIHARA ◽  
Suminori TANAKA ◽  
Sigeo KAWAKAMI ◽  
Kazunori NAKAGAWA ◽  
Masahiro KATO ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Iron Oxide ◽  
Methane Oxidation ◽  
Sulfate Ion ◽  
Structure And Activity

scholarly journals Discovery of Fe7O9: a new iron oxide with a complex monoclinic structure

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ryosuke Sinmyo ◽  
Elena Bykova ◽  
Sergey V. Ovsyannikov ◽  
Catherine McCammon ◽  
Ilya Kupenko ◽  
...  
Keyword(s):  
Applied Sciences ◽  
Crystal Structure ◽  
Iron Oxide ◽  
Iron Oxides ◽  
Industrial Applications ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Insight Into

Abstract Iron oxides are fundamentally important compounds for basic and applied sciences as well as in numerous industrial applications. In this work we report the synthesis and investigation of a new binary iron oxide with the hitherto unknown stoichiometry of Fe7O9. This new oxide was synthesized at high-pressure high-temperature (HP-HT) conditions, and its black single crystals were successfully recovered at ambient conditions. By means of single crystal X-ray diffraction we determined that Fe7O9 adopts a monoclinic C2/m lattice with the most distorted crystal structure among the binary iron oxides known to date. The synthesis of Fe7O9 opens a new portal to exotic iron-rich (M,Fe)7O9 oxides with unusual stoichiometry and distorted crystal structures. Moreover, the crystal structure and phase relations of such new iron oxide groups may provide new insight into the cycling of volatiles in the Earth’s interior.

A novel one-dimensional CoIIcoordination polymer:catena-poly[[hexaaquacobalt(II)] [[diaquabis(sulfato-κO)cobalt(II)]-μ-4,4′-bipyridine-κ2N:N′] [[triaqua(sulfato-κO)cobalt(II)]-μ-4,4′-bipyridine-κ2N:N′]]

2012 ◽  
Vol 68 (9) ◽  
pp. m265-m268 ◽  
Author(s):  
Kai-Long Zhong ◽  
Ming-Yi Qian
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
The Other ◽  
Water Molecules ◽  
Supramolecular Network ◽  
Sulfate Ion ◽  
Sulfate Ions ◽  
One Dimensional ◽  
The Third ◽  
Hydrogen Bonding Interactions

The title compound, {[Co(H2O)6][Co(SO4)(C10H8N2)(H2O)3][Co(SO4)2(C10H8N2)(H2O)2]}n, contains three crystallographically unique CoIIcentres, all of which are in six-coordinated environments. One CoIIcentre is coordinated by two bridging 4,4′-bipyridine (4,4′-bipy) ligands, one sulfate ion and three aqua ligands. The second CoIIcentre is surrounded by two N atoms of two 4,4′-bipy ligands and four O atoms,i.e.two O atoms from two monodentate sulfate ions and two from water molecules. The third CoIIcentre forms part of a hexaaquacobalt(II) ion. In the crystal structure, there are two different one-dimensional chains, one being anionic and the other neutral, and adjacent chains are arranged in a cross-like fashion around the mid-point of the 4,4′-bipy ligands. The structure features O—H...O hydrogen-bonding interactions between sulfate anions and water molecules, resulting in a three-dimensional supramolecular network.

Crystal structure and activity of protein L-isoaspartyl-O-methyltransferase from Vibrio cholerae, and the effect of AdoHcy binding

2015 ◽  
Vol 583 ◽  
pp. 140-149 ◽  
Author(s):  
Tanaya Chatterjee ◽  
Debadrita Mukherjee ◽  
Mousumi Banerjee ◽  
Barun K. Chatterjee ◽  
Pinak Chakrabarti
Keyword(s):  
Crystal Structure ◽  
Vibrio Cholerae ◽  
Protein L ◽  
Structure And Activity

Powder diffraction analysis of gemstone inclusions

2011 ◽  
Vol 26 (1) ◽  
pp. 48-52 ◽  
Author(s):  
Laura Leon-Reina ◽  
José M. Compana ◽  
Ángeles G. De la Torre ◽  
Rosa Moreno ◽  
Luis E. Ochando ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Iron Oxide ◽  
Powder Diffraction ◽  
Rietveld Method ◽  
Metallic Copper ◽  
Oxide Inclusion ◽  
Rock Crystal ◽  
Diffraction Peaks ◽  
Crystal Quartz ◽  
Lapis Lazuli

Gemstones are pieces of materials that once cut and polished are used as jewels or adornments. Gemstones may be single crystal (such as diamonds), polycrystalline (such as lapis lazuli), or amorphous (such as amber). In any case, gems may have inclusions that may yield a variety of optic effects. It is also important to unravel the crystal structure of the inclusion(s) in order to determine the origin of the gem and to help to understand their formation mechanism. Here, we expand the use of powder diffraction to identify crystalline inclusions in bulk gemstones highlighting Mo Kα radiation to penetrate within compact gems. Initially, rock crystal quartz with rutile needles was investigated and rutile diffraction peaks were more conspicuous in the Mo pattern than in the Cu pattern. Next, rock crystal quartz with beetle legs was characterized and the red iron oxide inclusion was identified as hematite. The study of a fake gem, glass showing aventurine effect, gave the diffraction peaks of metallic copper. Later, polycrystalline gems, moss agate, and aventurine quartz were also studied. The powder patterns of these compact gemstones could be successfully fitted using the Rietveld method. Finally, we discuss opportunities for further improvements in laboratory powder diffraction to characterize inclusions in compact gems.

scholarly journals X-ray crystal structure and activity of fluorenyl-based compounds as transthyretin fibrillogenesis inhibitors

2015 ◽  
Vol 31 (5) ◽  
pp. 824-833 ◽  
Author(s):  
Lidia Ciccone ◽  
Susanna Nencetti ◽  
Armando Rossello ◽  
Livia Tepshi ◽  
Enrico A. Stura ◽  
...  
Keyword(s):  
Crystal Structure ◽  
X Ray ◽  
Structure And Activity

Study on Catalysis Properties of Graphene Catalyst Loading Iron Oxide

2013 ◽  
Vol 316-317 ◽  
pp. 1014-1017 ◽  
Author(s):  
Qiao Wen Yang ◽  
Peng Fei Li ◽  
Ying Zhu ◽  
Chen Ying ◽  
Jin Lei Zuo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Iron Oxide ◽  
Liquid Phase ◽  
Sodium Borohydride ◽  
Graphite Oxide ◽  
Catalyst Loading ◽  
Oxidation Method ◽  
Scr Catalysts ◽  
Phase Oxidation ◽  
Reaction Unit

The graphite oxide was synthesized with Hummers liquid-phase oxidation method in experiment, and then was reduced to graphene by sodium borohydride, the iron oxide was loaded by dipping method. The catalyst that made reacted in SCR reaction unit in laboratory, the catalysis properties of catalyst was investigated. The experiment results showed that graphene was flake nanometer sheet and presented transparent fold shape, its crystal structure was in order arrangement; the nature of graphene was close to that of raw graphite; their surface function groups were similar; Fe/graphene SCR catalysts had certain catalytic ability in the reaction, the NO conversion rate of catalyst was about 50% while the temperature range was from 200°C to 300°C.

scholarly journals Crystal structure of the RNA 2′,3′-cyclic phosphodiesterase fromDeinococcus radiodurans

2017 ◽  
Vol 73 (5) ◽  
pp. 276-280 ◽  
Author(s):  
Wanchun Han ◽  
Jiahui Cheng ◽  
Congli Zhou ◽  
Yuejin Hua ◽  
Ye Zhao
Keyword(s):  
Crystal Structure ◽  
Active Site ◽  
Catalytic Mechanism ◽  
Deinococcus Radiodurans ◽  
Sulfate Ion ◽  
Open Conformation ◽  
Domains Of Life

2′,3′-Cyclic phosphodiesterase (CPDase) homologues have been found in all domains of life and are involved in diverse RNA and nucleotide metabolisms. The CPDase fromDeinococcus radioduranswas crystallized and the crystals diffracted to 1.6 Å resolution, which is the highest resolution currently known for a CPDase structure. Structural comparisons revealed that the enzyme is in an open conformation in the absence of substrate. Nevertheless, the active site is well formed, and the representative motifs interact with sulfate ion, which suggests a conserved catalytic mechanism.

A study of the effect of sulphation on iron oxide catalysts for methane oxidation

1998 ◽  
Vol 45 (1-4) ◽  
pp. 47-54 ◽  
Author(s):  
A.S.C Brown ◽  
J.S.J Hargreaves ◽  
B Rijniersce
Keyword(s):  
Iron Oxide ◽  
Methane Oxidation ◽  
Oxide Catalysts

scholarly journals Morpholine-4-carboxamidinium sulfate

IUCrData ◽  
2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Ioannis Tiritiris ◽  
Willi Kantlehner
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Planar Geometry ◽  
Asymmetric Unit ◽  
Sulfate Ion ◽  
Double Bond Character ◽  
Dimensional Network ◽  
Bond Character

The asymmetric unit of the title salt, 2C5H12N3O+·SO42−, comprises two cations and one sulfate ion. In both cations, the C, N and O atoms of the morpholine rings are disordered over two sets of sites, with refined occupancies of 0.849 (3):0.151 (3) for cation I and 0.684 (4):0.316 (4) for cation II. The C—N bond lengths in both central C3N units of the carboxamidinium ions range between 1.253 (12) and 1.362 (5) Å, indicating a degree of double-bond character. The central C atoms are bonded to the three N atoms in a nearly ideal trigonal–planar geometry and the positive charges are delocalized in both CN3planes. The crystal structure is stabilized by a three-dimensional network of N—H...O hydrogen bonds between the cations and the sulfate ion. Scheme tiny font, charges and delocalized bonds almost invisible

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