Category: 10049-08-8

Electric Literature of 10049-08-8, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 10049-08-8, Cl3Ru. A document type is Article, introducing its new discovery.

Mixed-ligand Ru(II) complexes with 2,2?-bipyridine and tetradentate Schiff bases auxiliary ligands: Synthesis, physico-chemical study, DFT analysis, electrochemical and Na+ binding properties

cis-Bis(2,2?-bipyridyl)dichlororuthenium(II)dihydrate complexed with Schiff bases salen (L1H2) and salophen (L2H2) provides complexes of compositions [Ru(L1)(bpy)2] 1 and [Ru(L2)(bpy)2] 2, respectively with cavity. The structure of these complexes characterized by spectroscopic studies were supported by their optimized geometries based on DFT calculations. Complexes 1 and 2 were then allowed to interact with methanolic solution of sodium perchlorate separately providing corresponding complexes 3 and 4 with the compositions 1¡¤NaClO4 and 2¡¤NaClO4, respectively. The formation constants were then evaluated by monitoring the changes in their UV-visible spectral features upon addition of different amount of sodium salts in the presence of a fixed concentration of the ruthenium complexes at a wavelength 294 nm. Emission (solution), luminescence microscopic and cyclic voltammetric studies of these complexes have also been made.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Electrooxidation of methanol on upd-Ru and upd-Sn modified Pt electrodes

The electrochemical oxidation of methanol has been investigated on underpotentially deposited-ruthenium-modified platinum electrode (upd-Ru/Pt) and on underpotentially deposited-tin-modified platinum electrode (upd-Sn/Pt). The submonolayers of upd-Ru and upd-Sn on a Pt electrode increased the rate of methanol electrooxidation several times as large as that on a pure Pt electrode. The best performance for methanol electrooxidation was obtained on a ternary platinum based catalyst modified by upd-Ru and upd-Sn simultaneously. The influence of the submonolayers of upd-Ru adatoms and upd-Sn adatoms on the oxidation of methanol in acid has been investigated. The effect of Ru on methanol electrooxidation lies on the distribution of Ru adatoms on a Pt surface. It has been shown that as long as the amount of upd-Ru deposits were controlled in a proper range, upd-Ru deposits would enhance the methanol oxidation obtained on a Pt electrode at whichever deposition potential the upd-Ru deposits were obtained. The effects of tin are sensible to the potential range. The enhancement effect of upd-Sn adatoms for the oxidation of methanol will disappear as the electrode potential is beyond a certain value. It is speculated that there exists a synergetic effect on the Pt electrode as adatoms Ru and Sn participate simultaneously in the methanol oxidation.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Ruthenium (III)-catalyzed oxidative cleavage of thiamine hydrochloride with N-bromosuccinimide in presence of hydrochloric acid medium: A kinetic and mechanistic approach

The kinetics of ruthenium (III)-catalyzed oxidative cleavage of thiamine hydrochloride (THM, Vitamin B1) with N-bromosuccinimide (NBS) in HCl medium has been investigated at 308 K. The oxidation reaction follows the rate law, -d[NBS]/dt = k[NBS] [Ru(III)]a [THM]b [H+]-c [Cl-]-d, where a, b, c and d are less than unity. The stiochiometry of the reaction was found to be 1:1, and 2-(4-methyl thiazol-5-yl) ethanol and 4-amino-2-methylpyrimidine-5-carbaldehyde were identified as the oxidation products of THM. The reaction was examined with reference to variation of ionic strength of the medium and addition of the deduction product NBS, succinamide (RNH). The change in relative permittivity of the medium affected by changing the solvent composition with acetonitrile has been studied. The reaction constants involved in the mechanism were computed. The overall activation parameters have been evaluated from the Arrhenius plot. HOBr has been postulated as the reactive oxidizing species. The observed results have been explained by plausible mechanisms and the relative rate laws have been deduced.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Ruthenium-catalyzed hydrative dimerization of allenes

Hydrative dimerization and hydration of allenes proceeded in the presence of a ruthenium catalyst and a strong acid such as trifluoroacetic acid. gamma,delta-Unsaturated ketones and methyl ketones were isolated in moderate combined yields. No isomeric compound (isomeric enone) was isolated. Copyright

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 10049-08-8, Name is Ruthenium(III) chloride, molecular formula is Cl3Ru. In a Article£¬once mentioned of 10049-08-8, Recommanded Product: Ruthenium(III) chloride

An air-stable P-chiral phosphine ligand for highly enantioselective transition-metal-catalyzed reactions

A new P-chiral phosphine ligand, (R,R)-2,3-bis(tert-butylmethylphosphino)quinoxaline, has been prepared by the reaction of enantiomerically pure tert-butylmethylphosphine-borane with 2,3-dichloroquinoxaline. This ligand, in contrast to most of the previously reported P-chiral ligands, is an air-stable solid and exhibits excellent enantioselectivities in both Rh-catalyzed asymmetric hydrogenations and Rh- or Pd-catalyzed carbon-carbon bond-forming reactions. Copyright

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Spectrophotometric determination of Ru(III) using rhodanine

A simple and direct spectrophotometric method using 2-thion-thiazolid-4-one has been developed for determination of Ru(III). Molar absorptivity and Sandell’s sensitivity are calculated to be 6.5555¡Á103 L mol-1cm-1 and 0.0154 mug cm-2 respectively. The effect of various parameters including time, pH and volume of reagent has been studied. The Beer’s law is obeyed over the range 0.202-6.873 mug of Ru(III).The method has been applied for the determination of Ru(III) in various synthetic and real samples.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Ruthenium(III)-catalyzed oxidation of 2-phenylethylamine with sodium N-chlorobenzenesulphonamide in hydrochloric acid solution: A kinetic and mechanistic study

The kinetics of ruthenium(III)-catalyzed oxidation of 2-phenylethylamine (PEA) with sodium N-chlorobenzenesulphonamide or chloramine-B (CAB) in hydrochloric acid solution has been studied at 313 K. The reaction rate shows first-order dependence each on [CAB], [H+] and [Ru(III)Cl3] and fractional order on [PEA] and [Cl-]. Variation of ionic strength and addition of the reduction product of CAB has no significant effect on the rate. There is a negative effect of dielectric constant of the solvent. The stoichiometry of the reaction was found to be 1:1 and the oxidation product of 2-phenylethylamine was identified as phenyl acetaldehyde. The reaction was studied at different temperatures and the activation parameters have been evaluated from the Arrhenius plot. The reaction constants involved in the mechanisms were computed. RN+H2Cl has been postulated as the reactive oxidizing species. Mechanisms consistent with the observed kinetic data have been proposed and discussed.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Ruthenium(III) Catalyzed Oxidation of Diphenyl Sulfoxide by N-Sodio-N-Bromobenzenesulfonamide in Hydrochloric Acid: a Kinetic Study

The kinetics of oxidation of diphenylsulfoxide (DPSO) by N-sodio-N-bromobenzenesulfonamide also known as bromamine-B (BAB) has been studied in HCl solution at 30¡ãC. In the absence of Ru(III), the rate shows a first-order dependence on [BAB] and fractional-order dependence each on [DPSO] and [H(+)]. In the presence of Ru(III), the rate is firstorder with respect to [BAB] and fractional-order each on [DPSO], [H(+)] and [Ru(III)] at low acid concentration. At high acid concentration the reactionrate shows a first-order dependence each on [oxidant], [DPSO] and [H(+) ] and fractional-order on [Ru(III)]. The variation of the ionic strength, dielectric constant of the medium and addition of chloride ion and thereaction product of BAB (benzenesulfonamide) do not have any significan t effect on the reaction rate. The activation parameters have been evaluated. The value of the protonation constant of monobromamine-B, 84.7 at 303 K, is evaluated from the proposed mechanism. Mechanisms consistent with the observed kinetic data have been proposed.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

10049-08-8, Name is Ruthenium(III) chloride, molecular formula is Cl3Ru, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 10049-08-8, category: ruthenium-catalysts

Preparation, characterization and catalytic behavior of perovskites with nominal compositions La1-xSrxGa1-2yCuyRuyO3

Catalysts of the compositions La1-xSrxGa1-2yCuyRuyO3 with 0?x?0.2 and 0?y?0.35 have been prepared ex situ as powders and in situ on a cordierite monolith provided with a Ga2O3 washcoat. The samples were characterized by X-ray diffraction, scanning electron microscopy/energy dispersive spectrometry, and analytic transmission electron microscopy/energy dispersive spectrometry studies. Selected samples were subjected to catalytic tests with respect to oxidation of CO and C3H6 and reduction of NO under rich and lean conditions, respectively. It was found that Cu and Ru ions could replace Ga in the perovskite structure of LaGaO3, as outlined in the formula above, whereas the solubility of Sr was limited to x?0.10. The replacement of some Ga by Cu and Ru ions improved the catalytic activity for oxidation of CO and C3H6 and reduction of NO under rich conditions, whereas under lean conditions, no activity for reduction of NO was observed. The light-off temperatures recorded under rich conditions for oxidation of CO and C3H6 and reduction of NO for the La0.8Sr0.2Ga0.8Cu0.1Ru0.1O3 samples prepared in situ, T50 = 374, 357, and 461 C, respectively, were 50-100 lower than for the ex situ prepared sample.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 10049-08-8, Cl3Ru. A document type is Article, introducing its new discovery., Recommanded Product: Ruthenium(III) chloride

Enantioselective hydrogenation of levulinic acid esters in the presence of the RuII-BINAP-HCl catalytic system

The rate of hydrogenation of gamma-ketoesters MeCOCH2CH 2COOR (R = Et, Pri, But) in the presence of the chiral RuII-BINAP catalyst (BINAP is 2,2?- bis(diphenylphosphino)-1,1?-binaphthyl) greatly increases upon the addition of 5-10 equivalents of HCl with respect to ruthenium. In the hydrogenation of ethyl levulinate, the optically active gamma-hydroxy ester initially formed would cyclize by ?95% to give gamma-valerolactone with optical purity of 98-99% ee. When the Ru(COD)(MA)2-BINAP-HCl catalytic system is used (COD is 1,5-cyclooctadiene, MA is 2-methylallyl), complete conversion of the ketoester (R = Et) in EtOH is attained in 5 h at 60C under an H2 pressure of 60-70 atm.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI