Category: 10049-08-8

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Transient nonlinear optics of organometallic fullerene: Research on iron(III) and ruthenium(III) derivatives of C60

We synthesized and investigated ultrafast third-order optical response of iron(III) (Fe(III)) and ruthenium(III) (Ru(III)) coordinated fullerene derivatives, which were based on our former reported C60(NH2CN)5 series, at 830 nm. The Fe(III), which is electron deficient and blocks the intramolecular charge-transfer process, reduces the optical nonlinearity of the complexes. However, Ru(III), even it is also electron deficient, enhanced the optical nonlinearity for an order of magnitude. By analyzing the infrared spectrum, a possible effect of linked multi-fullerene molecule system is supposed.

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

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Kinetics and mechanistic study of the ruthenium(III) catalyzed oxidative deamination and decarboxylation of L-valine by alkaline permanganate

The kinetics of ruthenium(III) catalyzed oxidation of L-valine by permanganate in alkaline medium at a constant ionic strength has been studied spectrophotometrically. The reaction between permanganate and L-valine in alkaline medium exhibits 2:1 stoichiometry (KMnO4:L-valine). The reaction shows first-order dependence on the concentration of permanganate and ruthenium(III) and less than unit-order dependence on the concentrations of L-valine and alkali. The reaction rate increases both with an increase in ionic strength and a decrease in solvent polarity of the medium. Initial addition of reaction products did not significantly affect the rate. A mechanism involving the formation of a complex between catalyst and substrate has been proposed. The activation parameters were computed with respect to the slowest step of the mechanism.

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

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NEUTRON SCATTERING STUDY OF HYDROGEN ON RUTHENIUM SULFIDE.

Incoherent inelastic neutron scattering (IINS) has been used to characterize hydrogen adsorption sites on ruthenium sulfide at 300 K. Hydrogen resides on sulfur anions to form SH groups, yielding two nondegenerate bending modes at 600 and 710 cm** minus **1. A smaller feature near 370 cm** minus **1 is assigned to a hydrogen-coupled lattice mode. Complementary hydrogen adsorption and H//2-D//2 exchange data further suggest that the active sites for hydrogen adsorption may be coordinatively unsaturated S-S anion pairs which provide sufficient electron density and satisfy the dual-site requirement necessary for hydrogen adsorption.

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

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MICELLAR-PROMOTED STEREOSELECTIVE PHOTOREDUCTION OF POTASSIUM ETHYLENEDIAMINETETRAACETATOCOBALTATE(III) BY A LONG-CHAIN CHIRAL RUTHENIUM(II) COMPLEX.

This work decribes the micellar-accelerated chiroselective photoreduction of potassium ethylenediaminetetraacetatocobaltate(III), KCo(edta), by the following longchain chiral ruthenium(II) complex with ionic or nonionic surfactants of cetyltrimethylammonium bromide (CTAB), polyoxyethylene (9. 5) octylphenol (Triton X), and sodium dodecylsulfate (SDS).

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

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Switch-on luminescence detection of steroids by tris(bipyridyl)ruthenium(II) complexes containing multiple cyclodextrin binding sites

A luminescent ruthenium(II) complex with six cyclodextrin binding sites is shown to switch off its emission upon binding of N,N’-dinonyl-4,4′- bipyridinium bromide and to recover luminescence upon displacement of the bipyridinium ion by asteroid.

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

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Mechanism of Ru(III) catalysis in N-bromoacetamide oxidation of some glycols in perchloric acid media

The kinetics of ruthenium(III) chloride catalysis in the oxidation of diethylene glycol (DG) and methyl diethylene glycol (MDG) by N-bromoacetamide (NBA) in perchloric acid media are reported. The reactions follow identical kinetics, showing zero-order dependence on NBA, but first-order on each of H+, Ru(III) and Cl- ions. The first-order kinetics with respect to glycol at low concentrations shifts to zero-order at higher concentrations. A negative effect of ionic strength is observed, while successive addition of acetamide, D2O and mercuric acetate shows zero effect on the reaction rate.

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

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Selective formation of a coordinatively unsaturated metal complex at a surface: A SiO2-immobilized, three-coordinate ruthenium catalyst for alkene epoxidation

(Chemical Equation Presented) Unsaturated but air-stable: A three-coordinate Ru complex, 2, highly active for alkene epoxidation and recyclable in air, was prepared on SiO2 by exploiting the exothermic reaction between O2 and isobutyraldehyde (IBA) to eliminate a p-cymene ligand from a coordinatively saturated precursor 1 (Ru red, Cl dark blue, N green, S yellow, O blue, C gray, H white). In contrast, direct activation with O2 alone was calculated to be endothermic.

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

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Kinetic and mechanistic study of Br(V) oxidation of glycolic acid catalysed by aquochlororuthenium(III) complex at different acid strengths: Evaluation of individual rate constants and thermodynamic parameters

Oxidation of glycolic acid (GA) by bromate in the presence of perchloric acid at moderate and low concentrations is catalysed by aquochlororuthenium(III) complex. The reactions at moderate and low acid strengths exhibit different kinetic behaviour on account of existence of catalyst in different forms. In moderate acid solutions, the mechanism proposed involves the oxidation of Ru(III) to Ru(V) by oxidant which in turn forms a reversible complex with substrate in the ratio of 1:2. The decomposition of the complex thus formed, into products is the slow rate determining step. At lower [acid], the mechanism is visualised as the formation of reversible complex between GA and catalyst preceding the formation of an intermediate with the oxidant in a slow-step. The decomposition of the intermediate into products is assumed to be the fast step. The rate constants involved in all individual steps of the reactions are evaluated along with their activation parameters 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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Electrophoretic deposition (EPD) of hydrous ruthenium oxides with PTFE and their supercapacitor performances

The effect of PTFE addition was investigated for the electrophoretic deposition (EPD) of hydrous ruthenium oxide electrodes. Mechanical stability of electrode layers, together with deposition yield, was enhanced by using hydrous ruthenium oxide/PTFE dispersions. High supercapacitor performance was obtained for the electrodes prepared with 2% PTFE and 10% water. When PTFE content was higher, the rate capability became poor with low electronic conductivity; higher water content than 10% resulted in non-uniform depositions with poor cycleability and power capability. When electrodes were heat treated at 200 C for 10 h, the specific energy was as high as 17.6 Wh/kg based on single electrode (at 200 W/kg); while utilizable energy was lower with heat treatment time of 1 and 50 h, due to the high resistance and gradual crystallization, respectively. With PTFE addition and heat treatment at 200 C for 10 h, the specific capacitance was increased by 31% (460 ? 599 F/g at ca. 0.6 mg/cm2) at 10 mV/s, and the deposition weight was increased up to 1.7 mg/cm2 with initial capacitance of 350 F/g.

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

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.10049-08-8, Name is Ruthenium(III) chloride, molecular formula is Cl3Ru. In a Article£¬once mentioned of 10049-08-8, Application In Synthesis of Ruthenium(III) chloride

2,9-Di-(2?-pyridyl)-1,10-phenanthroline: A tetradentate ligand for Ru(II)

The tetradentate ligand 2,9-di-(2?-pyridyl)-1,10-phenanthroline is synthesized in 62% yield by the Stille coupling of 2,9-dichloro-1,10-phenanthroline and 2-(tri-n-butylstannyl)pyridine. Treatment of this ligand with RuCl3¡¤3H2O and a 4-substituted pyridine results in the formation of a complex in which the tetradentate ligand occupies the equatorial plane and two pyridines are bound axially. The interior N-Ru-N angles vary from 76.1 to 125.6, showing considerable distortion from the 90 ideal. The lowest energy electronic transition is sensitive to the electronegativity of the 4-substituent on the axial pyridines, varying from 516 nm for the CF3 group to 580 nm for the NMe2. The oxidation potentials mirror this trend, spanning a range of 1.36-1.03 V, while the reduction potentials show less variation (-0.97 to -1.08 V). The complexes are nonemissive, presumably due to competitive nonradiative processes caused by distortion of the system. Copyright

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