Übergangsmetall-substituierte Phosphane, Arsane und Slibane, XXIV [1] Funktionelle Arsanliganden durch Reaktion von Übergangsmetalldimethylarsinsulfiden mit Aeetylhalogenid [2] / Transition Metal Substituted Phosphanes, Arsanes and Stibanes, XXIV [1] Functional Arsane Ligands via Reaction of Transition Metal-Dimethylarsinesulfides with Acetylhalide [2]

1980 ◽  
Vol 35 (10) ◽  
pp. 1207-1211 ◽  
Author(s):  
Reinhard Janta ◽  
Wolfgang Malisch
Keyword(s):  
Transition Metal ◽  
Conductivity Measurements ◽  
Composition And Structure

Abstract The interaction of the transition metal dimethylarsine sulfides Cp(CO)2PMe3M-As(S)Me2 (M = Mo, W) with acetylhalides yields cationic complexes bearing the Me2AsSC(O)Me or Me2AsCl(Br) ligand, respectively. In a first step, the salt [Cp(CO)2PMe3M-AsMe2SC(O)Me]⊕X⊖ 1a-c (X = Cl, Br) is formed, which is converted by a second mole MeC(O)X into salts [Cp(CO)2PMe3M-AsMe2X]⊕X⊖ 2a-c, with (Me2CO)2S elimination. The brominated complex 2b can also be obtained by the addition of Br2 to Cp(CO)2PMe3W-AsMe2. The composition and structure of the ionic dihalogen adducts are established by NMR and IR data and by conductivity measurements.

scholarly journals Selective Oxidation of Glycerol Using 3% H2O2 Catalyzed by Supported Nano-Au Catalysts

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 505 ◽  
Author(s):  
Xiaoli Wang ◽  
Gongde Wu ◽  
Tongfa Jin ◽  
Jie Xu ◽  
Shihao Song
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Selective Oxidation ◽  
Mixed Oxide ◽  
Transition Metal Oxides ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
Glyceric Acid ◽  
Glycerol Conversion ◽  
Composition And Structure

A series of transition metal oxides or mixed oxides supported nano-Au catalysts were prepared for the selective oxidation of glycerol to glyceric acid using 3% H2O2. It was found that the composition and structure of supports significantly influenced the catalytic performance of catalysts. The mesoporous trimetal mixed oxide (CuNiAlO) supported nano-Au catalysts were more active in comparison with the others. In the present catalytic system, the highest glycerol conversion was 90.5%, while the selectivity of glyceric acid could reach 72%. Moreover, the catalytic performance remained after 11 times of reaction.

scholarly journals Fabrication of Phosphorus-Doped Cobalt Silicate with Improved Electrochemical Properties

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6240
Author(s):  
Jie Ji ◽  
Yunfeng Zhao ◽  
Yifu Zhang ◽  
Xueying Dong ◽  
Changgong Meng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Specific Surface ◽  
Electrochemical Properties ◽  
Electrode Materials ◽  
Electrochemical Performances ◽  
Composition And Structure ◽  
High Theoretical Capacity ◽  
Novel Strategy ◽  
Transition Metal Silicates ◽  
Phosphorus Doped

The development of electrode materials for supercapacitors (SCs) is greatly desired, and this still poses an immense challenge for researchers. Cobalt silicate (Co2SiO4, denoted as CoSi) with a high theoretical capacity is deemed to be one of the sustainable electrode materials for SCs. However, its achieved electrochemical properties are still not satisfying. Herein, the phosphorus (P)-doped cobalt silicate, denoted as PCoSi, is synthesized by a calcining strategy. The PCoSi exhibits 1D nanobelts with a specific surface area of 46 m2∙g−1, and it can significantly improve the electrochemical properties of CoSi. As a supercapacitor’s (SC’s) electrode, the specific capacitance of PCoSi attains 434 F∙g−1 at 0.5 A∙g−1, which is much higher than the value of CoSi (244 F∙g−1 at 0.5 A∙g−1). The synergy between the composition and structure endows PCoSi with attractive electrochemical properties. This work provides a novel strategy to improve the electrochemical performances of transition metal silicates.

Darstellung und Komplexierungsverhalten von 2.4.6-Tri(4-pyridyl)-s-triazin / Preparation and Complex Behaviour of 2,4,6-Tri(4-pyridyl)-s-triazine

1974 ◽  
Vol 29 (5-6) ◽  
pp. 360-362 ◽  
Author(s):  
Hans-G. Biedermann ◽  
Klaus Wichmann
Keyword(s):  
Electrical Conductivity ◽  
Transition Metal ◽  
Ir Spectra ◽  
Conductivity Measurements ◽  
Metal Chlorides ◽  
Complex Behaviour

2,4,6-Tri(4-pyridyl)-s-triazine is prepared from 4-cyanopyridine by a cationic and anionic mechanism. It forms with transition metal chlorides in toluene or benzene the complexes: (FeCl3)3(TPyT)2, and (MeCl2)3(TPyT)2 with Me = Ni, Co, Cu.The IR spectra, magnetic and electrical conductivity measurements are discussed.

Tunable coupling of terahertz Dirac plasmons and phonons in transition metal dichalcogenide-based van der Waals heterostructures

2D Materials ◽  
2021 ◽  
Author(s):  
Icaro Rodrigues Lavor ◽  
Andrey Chaves ◽  
Francois M Peeters ◽  
Ben Van Duppen
Keyword(s):  
Transition Metal ◽  
Fermi Energy ◽  
Van Der Waals ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Phonon Coupling ◽  
Van Der Waals Heterostructures ◽  
Composition And Structure ◽  
Metal Dichalcogenides ◽  
Tunable Coupling

Abstract Dirac plasmons in graphene hybridize with phonons of transition metal dichalcogenides (TMDs) when the materials are combined in so-called van der Waals heterostructures (vdWh), thus forming surface plasmon-phonon polaritons (SPPPs). The extend to which these modes are coupled depends on the TMD composition and structure, but also on the plasmons' properties. By performing realistic simulations that account for the contribution of each layer of the vdWh separately, we calculate how the strength of plasmon-phonon coupling depends on the number and composition of TMD layers, on the graphene Fermi energy and the specific phonon mode. From this, we present a semiclassical theory that is capable of capturing all relevant characteristics of the SPPPs. We find that it is possible to realize both strong and ultra-strong coupling regimes by tuning graphene's Fermi energy and changing TMD layer number.

scholarly journals High-Pressure Annealing of a Prestructured Nanocrystalline Precursor to Obtain Tetragonal and Orthorhombic Polymorphs of Hf3N4

2014 ◽  
Vol 1655 ◽  
Author(s):  
Ashkan Salamat ◽  
Pierre Bouvier ◽  
Benjamin M. Gray ◽  
Andrew L. Hector ◽  
Simon A. J. Kimber ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Fluorite Structure ◽  
Metal Nitrides ◽  
Transition Metal Nitrides ◽  
X Ray Diffraction ◽  
Semiconducting Materials ◽  
Composition And Structure ◽  
Metal Organic ◽  
Diamond Anvil

ABSTRACTTransition metal nitrides containing metal ions in high oxidation states are a significant goal for the discovery of new families of semiconducting materials. Most metal nitride compounds prepared at high temperature and high pressure from the elements have metallic bonding. However amorphous or nanocrystalline compounds can be prepared via metal-organic chemistry routes giving rise to precursors with a high nitrogen:metal ratio. Using X-ray diffraction in parallel with high pressure laser heating in the diamond anvil cell this work highlights the possibility of retaining the composition and structure of a metastable nanocrystalline precursor under high pressure-temperature conditions. Specifically, a nanocrystalline Hf3N4 with a tetragonal defect-fluorite structure can be crystallized under high-P,T conditions. Increasing the pressure and temperature of crystallization leads to the formation of a fully recoverable orthorhombic (defect cottunite-structured) polymorph. This approach identifies a novel class of pathways to the synthesis of new crystalline nitrogen-rich transition metal nitrides.

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