Day: March 26, 2021

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, Quality Control of: Ruthenium(III) chloride

Hydrogen activation and reactivity of ruthenium sulfide catalysts: Influence of the dispersion

In order to examine the influence of the size of particles on the catalytic properties of sulfide catalysts, a series of ruthenium sulfide based catalysts, dispersed in a KY zeolite, supported on silica or unsupported, were prepared and characterized. Such a methodology allowed us to vary the particle size in a large domain. The particle sizes were determined by HREM for RuS2/silica (3.6 nm) and the unsupported sample (5 nm) and by SAXS for the zeolite catalyst (1.2 nm). From these measurements, the fractions of ruthenium and sulfur present at the surface of the catalysts were deduced. The TPR patterns of the three catalysts exhibit three peaks whose relative proportions were also related to the amount of surface sulfur. An excellent agreement was observed between both kinds of determination. Then, the influence of a progressive reduction of the surface on the adsorbing and catalytic properties of the three samples was studied in the whole S/Ru range. Striking similarities were observed for the three catalysts concerning the nature of the hydrogen species and the variation of the hydrogenation activity with S/Ru. Indeed, inelastic neutron scattering revealed the presence of hydride species, as was already observed for unsupported RuS2. The determination by TPD of the amount of hydrogen adsorbed and the measurements of catalytic activities allowed the determination of the turnover frequency for the catalysts of the present series. It appeared that these values are almost similar, which shows that the same active phase can be obtained as unsupported catalyst or highly dispersed in a zeolite. The interest of using this KY zeolite is to stabilize nanoparticles of sulfide phase inside its framework and consequently to obtain a high number of active sites.

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

Electric Literature of 92361-49-4, 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. 92361-49-4, C46H45ClP2Ru. A document type is Article, introducing its new discovery.

Syntheses, structures, and spectro-electrochemistry of {Cp*(PP)Ru}C?CC?C{Ru(PP)Cp*} (PP = dppm, dppe) and their mono- and dications

The complexes {Cp*(PP)Ru}2(mu-C?CC?C) (PP = dppm 5a, dppe 5b) have been synthesized from RuCl(PP)Cp* (1a/b) via the corresponding vinylidenes [Ru(=C=CH2)(PP)Cp*]+ (2a/b), deprotonation (KOBut) to the ethynyls Ru(C?CH)(PP)Cp* (3a/b), oxidative coupling ([FeCp 2][PF6]) to the bis(vinylidenes) [{Ru(PP)Cp*} 2{mu-(=C=CHCH=C=)}]2+ (4a/b), and deprotonation [dbu (4a), KOBut (4b)]. Electrochemistry of 5a/b revealed the expected sequence of four le redox steps, which occurred at significantly lower E values than found for the Ru(PPh3)2Cp analogue. Single-crystal X-ray structure determinations are reported for 1a/b, 2a/b, 3a/b, 4a/b, and 5a/b, together with the oxidized products [5b][PF6] n (n = 1, 2). In the monocation [5b][PF6] the Ru-C(1) [1.931(2) A] and C-C distances [1.248-1.338(3) A] are intermediate between those found in 5b and the dication [5b]2+. The short Ru-C [1.857(5) A] and experimentally equal C-C distances [1.269-1.280(6) A] in [5b] [PF6]2 confirm the anticipated dicarbene-cumulene structure for the Ru=C=C=C=C=Ru bridge.

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

Application of 172222-30-9. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 172222-30-9, Name is Benzylidenebis(tricyclohexylphosphine)dichlororuthenium. In a document type is Article, introducing its new discovery.

Assemblies of supramolecular porphyrin dimers in pentagonal and hexagonal arrays exhibiting light-harvesting antenna function

Porphyrin-based supramolecular macrocyclic arrays were synthesized as mimics of photosynthetic light-harvesting (LH) antennae. Pentameric and hexameric macrocyclic porphyrin arrays EP5 and EP6 were constructed by complementary coordination of m-bis(ethynylene)phenylene-linked zinc-imidazolylporphyrin Zn-EP-Zn. The proton NMR spectra of noncovalently linked N-EP5 and N-EP6 indicate fast rotation of the porphyrin moieties along the ethyne axis. These macrocycles were covalently linked and identified as C-EP5 (6832 Da) and C-EP6 (8199 Da) by mass spectrometry. Fluorescence quantum yields of C-EP2 (10.0%), C-EP5 (10.1%), and C-EP6 (11.0%), even larger than that of the unit coordination dimer C-EP1 (9.3%), were significantly increased from those of the series without the ethynylene linkage. The order of increasing fluorescence quantum yields was parallel to that of decreasing fluorescence lifetimes (C-EP1 (1.65 ns), C-EP2 (1.45 ns), C-EP5 (1.42 ns), and C-EP6 (1.38 ns)), indicating that the radiative decay rate kF increased relative to the other decay rates with an increase in the number of ring components. Based on the exciton-exciton annihilation and anisotropy depolarization times, the excitation energy hopping (EEH) times in these macrocyclic systems were obtained as 21 ps for C-EP5 and 12.8 ps for C-EP6. EEH times depend strongly on the orientation factor of the component transition dipoles in the macrocyclic arrays. The hexagonal macrocyclic array with an orientation of better transition dipole coupling resulted in faster EEH time compared to the pentagonal one.

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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. 301224-40-8, Name is (1,3-Dimesitylimidazolidin-2-ylidene)(2-isopropoxybenzylidene)ruthenium(VI) chloride, molecular formula is C31H38Cl2N2ORu. In a Article£¬once mentioned of 301224-40-8, Recommanded Product: 301224-40-8

Highly selective SmI2?H2O-promoted radical cyclisation of five-membered lactones

Radicals formed by SmI2?H2O-mediated electron transfer to the carbonyl group of unsaturated five-membered lactones undergo diastereoselective cyclisation to give cyclohexane-1,4-diols. The use of HMPA as an additive with SmI2?H2O gave improved conversion and diastereoselectivity in the cyclisations.

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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.301224-40-8, Name is (1,3-Dimesitylimidazolidin-2-ylidene)(2-isopropoxybenzylidene)ruthenium(VI) chloride, molecular formula is C31H38Cl2N2ORu. In a Article£¬once mentioned of 301224-40-8, Computed Properties of C31H38Cl2N2ORu

Cross metathesis of several methylenecyclopentane derivatives

The cross metathesis (CM) of several methylenecyclopentane derivatives using Hoveyda-Grubbs second generation catalyst 4 (5-10 mol %) has been studied. Medium to good yields of tetrasubstituted alkenes have been obtained. In the case of 8-methyl-2,5-dimethylene-2,3,5,6-tetrahydro-1H,4H-3a,6a- (methanoiminomethano)pentalene-7,9-dione 2 products from single, double and triple CM were formed. With 8-methyl-5-methylene-5,6-dihydro-3a,6a- (methanoiminomethano)pentalene-2,7,9(1H,3H,4H)-trione 3 a good yield of the CM product was obtained working at 140C in xylene for 3 d, showing the high thermal stability of this catalyst. In the CM of diene 2 and enone 3, the main products were always the anti-stereoisomers.

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

Reference of 10049-08-8, An article , which mentions 10049-08-8, molecular formula is Cl3Ru. The compound – Ruthenium(III) chloride played an important role in people’s production and life.

Syntheses and redox properties of bis(hydroxoruthenium) complexes with quinone and bipyridine ligands. Water-oxidation catalysis

The novel bridging ligand 1,8-bis(2,2?;6?,2?-terpyridyl)anthracene (btpyan) is synthesized by three reactions from 1,8-diformylanthracene to connect two [Ru(L)(OH)]+ units (L = 3,6-di-tert-buty1-1,2-benzoquinone (3,6-tBu2-qui) and 2.2?-bipyridine (bpy)). An addition of tBuOK (2.0 equiv) to a methanolic solution of [RuII2(OH)2(3.6-tBu2 qui)2(btpyan)](SbF6)2 ([1](SbF6)2) results in the generation of [RuII2(O)2(3,6-t Bu2sq)2(btpyan)]0 (3,6-tBu2sq = 3,6-di-tert-butyl-1,2-semiquinone) due to the reduction of quinone coupled with the dissociation of the hydroxo protons. The resultant complex [RuII2(O)2(3,6-t Bu2sq)2(btpyan)]0 undergoes ligand-localized oxidation at E1/2= +0.40 V (vs Ag/AgCl) to give [RuII2(O)2(3,6-t Bu2qui)2(btpyan)]2+ in MeOH solution, Furthermore, metal-localized oxidation of [RuII2(O)2(3,6-t Bu2qui)2(btpyan)]2+ at Ep= +1.2 V in CF3CH2OH/ether or water gives [RuIII2(O)2(3,6-t Bu2qui)2(btpyan)]4+, which catalyzes water oxidation. Controlled-potential electrolysis of [1](SbF6)2 at +1.70 V in the presence of H2O in CF3CH2OH evolves dioxygen with a current efficiency of 91% (21 turnovers). The turnover number of O2 evolution increases to 33 500 when the electrolysis is conducted in water (pH 4.0) by using a [1](SbF6)2-modified ITO electrode. On the other hand, the analogous complex [RuII2(OH)2(bpy)2(btpyan)]- (SbF6)2 ([2](SBF6)2) shows neither dissociation of the hydroxo protons, even in the presence of a large excess of tBuOK, nor activity for the oxidation of H2O under similar conditions.

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

In an article, published in an article, once mentioned the application of 32993-05-8, Name is Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II),molecular formula is C41H35ClP2Ru, is a conventional compound. this article was the specific content is as follows.HPLC of Formula: C41H35ClP2Ru

Mono and dinuclear complexes of half-sandwich platinum group metals (Ru, Rh and Ir) bearing a flexible pyridyl-thiazole multidentate donor ligand

The mononuclear cationic complexes [(eta6-C6H6)RuCl(L)]+ (1), [(eta6-p-iPrC6H4Me)RuCl(L)]+ (2), [(eta5-C5H5)Ru(PPh3)(L)]+ (3), [(eta5-C5Me5)Ru(PPh3)(L)]+ (4), [(eta5-C5Me5)RhCl(L)]+ (5), [(eta5-C5Me5)IrCl(L)]+ (6) as well as the dinuclear dicationic complexes [{(eta6-C6H6)RuCl}2(L)]2+ (7), [{(eta6-p-iPrC6H4Me)RuCl}2(L)]2+ (8), [{(eta5-C5H5)Ru(PPh3)}2(L)]2+ (9), [{(eta5-C5Me5)Ru(PPh3)}2(L)]2+ (10), [{(eta5-C5Me5)RhCl}2(L)]2+ (11) and [{(eta5-C5Me5)IrCl}2(L)]2+ (12) have been synthesized from 4,4?-bis(2-pyridyl-4-thiazole) (L) and the corresponding complexes [(eta6-C6H6)Ru(mu-Cl)Cl]2, [(eta6-p-iPrC6H4Me)Ru(mu-Cl)Cl]2, [(eta5-C5H5)Ru(PPh3)2Cl)], [(eta5-C5Me5)Ru(PPh3)2Cl], [(eta5-C5Me5)Rh(mu-Cl)Cl]2 and [(eta5-C5Me5)Ir(mu-Cl)Cl]2, respectively. All complexes were isolated as hexafluorophosphate salts and characterized by IR, NMR, mass spectrometry and UV-vis spectroscopy. The X-ray crystal structure analyses of [3]PF6, [5]PF6, [8](PF6)2 and [12](PF6)2 reveal a typical piano-stool geometry around the metal centers with a five-membered metallo-cycle in which 4,4?-bis(2-pyridyl-4-thiazole) acts as a N,N?-chelating ligand.

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

Reference of 10049-08-8, An article , which mentions 10049-08-8, molecular formula is Cl3Ru. The compound – Ruthenium(III) chloride played an important role in people’s production and life.

Probing the formation mechanism and chemical states of carbon-supported Pt-Ru nanoparticles by in situ X-ray absorption spectroscopy

The understanding of the formation mechanism of nanoparticles is essential for the successful particle design and scaling-up process. This paper reports findings of an X-ray absorption spectroscopy (XAS) investigation, comprised of X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) regions, to understand the mechanism of the carbon-supported Pt-Ru nanoparticles (NPs) formation process. We have utilized Watanabe’s colloidal reduction method to synthesize Pt-Ru/C NPs. We slightly modified the Watanabe method by introducing a mixing and heat treatment step of Pt and Ru oxidic species at 100C for 8 h with a view to enhance the mixing efficiency of the precursor species, thereby one can achieve improved homogeneity and atomic distribution in the resultant Pt-Ru/C NPs. During the reduction process, in situ XAS measurements allowed us to follow the evolution of Pt and Ru environments and their chemical states. The Pt LIII-edge XAS indicates that when H2PtCl6 is treated with NaHSO 3, the platinum compound is found to be reduced to a Pt(II) form corresponding to the anionic complex [Pt(SO3)4] 6-. Further oxidation of this anionic complex with hydrogen peroxide forms dispersed [Pt(OH)6]2- species. Analysis of Ru K-edge XAS results confirms the reduction of RuIIICl3 to [RuIII(OH)4]2- species upon addition of NaHSO3. Addition of hydrogen peroxide to [RuII(OH) 4]2- causes dehydrogenation and forms RuOx species. Mixing of [Pt(OH)6]2- and RuOx species and heat treatment at 100C for 8 h produced a colloidal sol containing both Pt and Ru metallic as well as ionic contributions. The reduction of this colloidal mixture at 300C in hydrogen atmosphere for 2 h forms Pt-Ru nanoparticles as indicated by the presence of Pt and Ru atoms in the first coordination shell. Determination of the alloying extent or atomic distribution of Pt and Ru atoms in the resulting Pt-Ru/C NPs reveals that the alloying extent of Ru (JRu) is greater than that of the alloying extent of Pt (JPt). The XAS results support the Pt-rich core and Ru-rich shell structure with a considerable amount of segregation in the Pt region and with less segregation in the Ru region for the obtained Pt-Ru/C NPs.

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Reference£º
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. 92361-49-4, C46H45ClP2Ru. A document type is Article, introducing its new discovery., SDS of cas: 92361-49-4

Ethinylkomplexe des rutheniums mit terminalen hauptgruppenelement-substituenten: Systematischer aufbau metallgebundener phosphoniumacetylid-liganden R?R2P(+)-C?C|(-)

Treatment of Cp*RuL2Cl (Cp* = C5Me5; L = PPh3, PMe3) with Me3SiC?CH in the presence of NH4[PF6] in CH2Cl2 yielded the expected vinylidene compounds [Cp*RuL2=C=CH2][PF6] with L = PPh3 (1) and PMe3 (1a), which were deprotonated by KOBut in THF to give the corresponding ethynyl complexes Cp*Ru(PPh3)2C?CH (2) and Cp*Ru(PMe3)2C?CH (2a). Metalation of 2 using n-BuLi or t-BuLi in THF-hexane, followed by reaction of the lithio intermediate Cp*Ru(PPh3)2C?CLi with ClER3 (E = Si, Ge, Sn) or C1PR2, resulted in the formation of substituted derivatives, Cp*Ru(PPh3)2C?CER3 [ER3 = SiMe3 (3), GeMe3 (4), SnBun3 (5)] and Cp*Ru(PPh3)2C?CPR2 [PR2 = PPh2 (6), PBut2 (7)] respectively. Quaternization of 6 and 7 by alkyl iodides in toluene smoothly produced phosphonioethynyl complexes, [Cp*Ru(PPh3)2C?CPR2R?]I [PR2R? = PPh2Me (8), PBut2Me (9), PPh2Prn (10), PBut2Prn (11)], the cations of which may be regarded as donor/acceptor-stabilized derivatives of dicarbon, C2.

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

Electric Literature of 246047-72-3, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.246047-72-3, Name is (1,3-Bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium, molecular formula is C46H65Cl2N2PRu. In a patent, introducing its new discovery.

Efficient total syntheses of (-)-colombiasin A and (-)-elisapterosin B: Application of the Cr-catalyzed asymmetric quinone Diels-Alder reaction

(Chemical Equation Presented) A made-to-order asymmetric catalytic reaction was applied in the key quinone Diels-Alder step of the total syntheses of the title compounds (see scheme for the synthesis of colombiasin A). The reaction was highly regio- and diastereoselective.

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