Effects of the Nature of Transition Metal on the Composition and Structure of Reaction Products of M[(OOCC5H4)Mn(CO)3]2[O(H)Me]4 (М = Cu(II), Ni(II), Co(II), or Mn(II)) with 1,10-Phenanthroline

2018 ◽  
Vol 63 (5) ◽  
pp. 610-617 ◽  
Author(s):  
A. A. Grineva ◽  
M. A. Uvarova ◽  
R. R. Datchuk ◽  
S. E. Nefedov
Keyword(s):  
Transition Metal ◽  
Reaction Products ◽  
Composition And Structure

A study of reaction of aromatic polynitro compounds with tributylstannyl hydride

1985 ◽  
Vol 50 (11) ◽  
pp. 2598-2606 ◽  
Author(s):  
Vladimír Macháček ◽  
Antonín Lyčka ◽  
Milan Nádvorník
Keyword(s):  
Nmr Spectra ◽  
Reaction Products ◽  
Tetramethylammonium Bromide ◽  
Composition And Structure

1H, 13C, 15N, and 119Sn NMR spectra have been used to study composition and structure of reaction products from 1,3,5-trinitrobenzene, methyl 2,4,6-trinitrobenzoate, 1-dimethylamino-2,4,6-trinitrobenzene, 1-methoxy-2,4,6-trinitrobenzene, 1-chloro-2,4,6-trinitrobenzene, 2,4,6-trinitrotoluene, 3,5-dinitrobenzonitrile and methyl 3,5-dinitrobenzoate with tributylstannyl hydride in the presence of tetramethylammonium bromide.

Decomposition of peroxobenzoic acid in benzene catalyzed by transition metal 2,4-pentanedionates

1984 ◽  
Vol 49 (3) ◽  
pp. 673-679 ◽  
Author(s):  
Pavel Lederer ◽  
Eva Mácová ◽  
Josef Vepřek-Šiška
Keyword(s):  
Transition Metal ◽  
Reaction Rate ◽  
Reaction Products ◽  
Acid Decomposition ◽  
Analogous Experiment ◽  
Catalytic Effects

The decomposition of peroxobenzoic acid in benzene was studied, and catalytic effects of Fe(III), Mn(III), Co(II), Co(III), and Cr(III) on the reaction rate and the composition of the reaction mixture were investigated. An analogous experiment carried out in perdeuterobenzene and determination of the distribution of deuterium in the reaction products provided evidence for the participation of the solvent in peroxobenzoic acid decomposition.

scholarly journals Photochemische Reaktionen von Übergangsmetall-Olefin-Komplexen, V [1]. Die Umsetzung von Tricarbonyl-η-6.6-dimethylfulven-chrom(0) mit 7-Methyl- und 7-Methoxycycloheptatrien / Photochemical Reactions of Transition Metal Olefin Complexes, V [1]. The Reactions of Tricarbonyl-η-6,6-dimethylfulvene-chromium(0) with 7-Methyl- and 7-Methoxycycloheptatriene

1982 ◽  
Vol 37 (10) ◽  
pp. 1322-1326 ◽  
Author(s):  
Cornelius G. Kreiter ◽  
Hans Kurz
Keyword(s):  
Nmr Spectroscopy ◽  
Transition Metal ◽  
Column Chromatography ◽  
Room Temperature ◽  
Photochemical Reactions ◽  
Membered Ring ◽  
Reaction Products ◽  
Methyl Group

Abstract The stereochemistry of the photo reaction products of tricarbonyl-η-6,6-dimethyl-fulvene-chromium(O) (1) with 7-methyl-and 7-methoxycycloheptatriene was studied by NMR-spectroscopy. Both trienes add to 1, displace a CO ligand, and form substituted dicarbonyl-η3-2-cycloheptadienylene-η5-2-cyclopentadienylidene-propane-chromium(0) complexes. With C7H7CH3 only one isomer (3) is formed with the methyl-group in endo-position and the enyl system encompassing C(1′)-C(3′) of the seven membered ring. C7H7OCH3 yields 3 isomers which were separated by column chromatography. 5 has the same constitution as 3. The isomers 4 and 5 bear the OCH3-group in e^o-position. The enyl system of 4 is located on C(1′)-C(3′), that of 6 on C(3′)-C(5′). 6 rearranges at room temperature to 4.

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 Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

2021 ◽  
Author(s):  
G. N. Gerasimov ◽  
V. F. Gromov ◽  
M. I. Ikim ◽  
L. I. Trachtenberg
Keyword(s):  
Metal Oxide ◽  
Reaction Products ◽  
Active Particles ◽  
Composition And Structure ◽  
Structure Of Metal ◽  
Catalytically Active ◽  
Reducing Gases ◽  
Oxide Composites ◽  
The Relationship

Abstract The relationship between the structure and properties of nanoscale conductometric sensors based on binary mixtures of metal oxides in the detection of reducing gases in the environment is considered. The sensory effect in such systems is determined by the chemisorption of oxygen molecules and the detected gas on the surface of metal oxide catalytically active particles, the transfer of the reaction products to electron-rich nanoparticles, and subsequent reactions. Particular attention is paid to the doping of nanoparticles of the sensitive layer. In particular, the effect of doping on the concentration of oxygen vacancies, the activity of oxygen centers, and the adsorption properties of nanoparticles is discussed. In addition, the role of heterogeneous contacts is analyzed.

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.

The Challenges Associated with Reaction Products Left in Scale Inhibitor Species after Radical Polymerization

2014 ◽  
Author(s):  
Jonathan J. Wylde
Keyword(s):  
Thermal Stability ◽  
Hydrogen Peroxide ◽  
Free Radical ◽  
Transition Metal ◽  
Radical Polymerization ◽  
Average Molecular Weight ◽  
Oil And Gas Industry ◽  
Reaction Products ◽  
Scale Inhibitor ◽  
End User

Abstract The use of polymeric scale inhibitors has been ubiquitously accepted by the oil and gas industry for many years. There are many benefits to the use of this type of chemistry that include aspects such as high performance, scale species selectivity, enhanced brine compatibility, favorable environmental properties and high thermal stability. A very common way to manufacture polymeric scale inhibitors is via free radical polymerization. Here an initiator is used to propagate the generation of free radicals from a species, such as hydrogen peroxide. The initiator chemistry can be very varied and usually comprises different types of transition metal salts, hypophosphite or persulfate species. Different monomer units can be polymerized using different initiator and free radical species to yield the same polymer. However, subtle differences can result, including poly-dispersity, average molecular weight and different residual composition. The implications for the end user of the chemistry can be profound regarding performance differences in aspects such as detectability, compatibility, thermal stability and sometimes even scale inhibition and adsorption efficacy. A case study has been presented where a very commonly used sulfonated copolymer species from four different sources was evaluated in a whole host of compatibility and performance tests. The different routes used different combinations of hydrogen peroxide and transition metal initiator or persulfate/hypophosphite combinations as the free radical source. There were major differences seen in the compatibility of these products with different scale inhibitors and then in performance. The tests performed highlighted the differences that can occur between the different radical polymerization synthetic routes mentioned above. The conclusions show that there are many benefits to being able to control the manufacturing process of scale inhibitor species in order to ensure the full composition is understood and can be quantified. The benefits to owning the supply chain are highlighted and lead to not only better control of quality and cost but, more importantly, to the overall risk reduction for the end user in the end use application.

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.

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