Tag: M.W:400-500

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Oxidation of Bromide to Bromine by Ruthenium(II) Bipyridine-Type Complexes Using the Flash-Quench Technique

Six ruthenium complexes, [Ru(bpy)3]2+ (1), [Ru(bpy)2(deeb)]2+ (2), [Ru(deeb)2(dmbpy)]2+ (3), [Ru(deeb)2(bpy)]2+ (4), [Ru(deeb)3]2+ (5), and [Ru(deeb)2(bpz)] 2+ (6) (bpy: 2,2?-bipyridine; deeb: 4,4?-diethylester-2,2?-bipyridine; dmbpy: 4,4?-dimethyl-2,2?-bipyridine, bpz: 2,2?-bipyrazine), have been employed to sensitize photochemical oxidation of bromide to bromine. The oxidation potential for complexes 1-6 are 1.26, 1.36, 1.42, 1.46, 1.56, and 1.66 V vs SCE, respectively. The bimolecular rate constants for the quenching of complexes 1-6 by ArN2+ (bromobenzenediazonium) are determined as 1.1 ¡Á 109, 1.6 ¡Á 108, 1.4 ¡Á 108, 1.2 ¡Á 108, 6.4 ¡Á 107, and 8.9 ¡Á 106 M-1 s-1, respectively. Transient kinetics indicated that Br- reacted with photogenerated Ru(III) species at different rates. Bimolecular rate constants for the oxidation of Br- by the Ru(III) species derived from complexes 1-5 are observed as 1.2 ¡Á 108, 1.3 ¡Á 109, 4.0 ¡Á 109, 4.8 ¡Á 109, and 1.1 ¡Á 1010, M-1 s-1, respectively. The last reaction kinetics observed in the three-component system consisting of a Ru sensitizer, quencher, and bromide is shown to be independent of the Ru sensitizer. The final product was identified as bromine by its reaction with hexene. The last reaction kinetics is assigned to the disproportionation reaction of Br2-? ions, for which the rate constant is determined as 5 ¡Á 109 M-1 s-1. Though complex 6 has the highest oxidation potential in the Ru(II)/Ru(III) couple, its excited state fails to react with ArN2+ sufficiently for subsequent reactions. The Ru(III) species derived from complex 1 reacts with Br- at the slowest rate. Complexes 2-5 are excellent photosensitizers to drive photooxidation of bromide to bromine.

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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. 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2. In a Article£¬once mentioned of 37366-09-9, Recommanded Product: 37366-09-9

Transition metal-catalyzed dehydrogenative germylation of olefins with tri-n-butylgermane

The catalyzed reaction of an excess of styrene with n-Bu3GeH using several ruthenium and rhodium complexes gave the corresponding vinylgermanes (alpha-trin-butylgermylstyrene, (Z)-beta-tri-n-butylgermylstyrene, and (E)-beta-tri-n-butylgermylstyrene), which are dehydrogenative germylation products. The most effective catalyst was RU3(CO)12, whose use resulted in selective formation of the vinylgermanes in high yields.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Recommanded Product: 37366-09-9. In my other articles, you can also check out more blogs about 37366-09-9

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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.37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2. In a Article£¬once mentioned of 37366-09-9, SDS of cas: 37366-09-9

Arene-ruthenium complexes with phosphanylferrocenecarboxamides bearing polar hydroxyalkyl groups-synthesis, molecular structure, and catalytic use in redox isomerizations of allylic alcohols to carbonyl compounds

Phosphanylferrocenecarboxamide Ph2P-fc-CONHCH2CH 2OH (1, fc = ferrocene-1,1?-diyl) and its newly synthesized congeners, Ph2P-fc-CONHCH(CH2OH)2 (2) and Ph2P-fc-CONHC(CH2OH)3 (3), were converted to a series of (eta6-arene)ruthenium complexes [(eta6- arene)RuCl2(L-kappaP)] 5-7, where arene is benzene, p-cymene, and hexamethylbenzene and L = 1-3. All compounds were characterized by multinuclear NMR and IR spectroscopy, by mass spectrometry, and by elemental analysis. The molecular structures of 2, 3, 3O (a phosphane oxide resulting from the oxidation of 3), 5c¡¤CH2Cl2, and 6c¡¤Et2O were determined by single-crystal X-ray diffraction analysis. The ruthenium complexes were further evaluated as catalysts in the redox isomerization of allyl alcohols to carbonyl compounds. Complex [(eta6-p-cymene) RuCl2(1-kappaP)] (5b) proved to be a particularly attractive catalyst, being both readily available and catalytically active. Substrates with unsubstituted double bonds were cleanly isomerized with this catalyst in 1,2-dichloroethane (0.5 mol-% Ru, 80 C), whereas for those bearing substituents at the double bond (particularly in the position closer to the OH group) lower conversions and selectivities were achieved. A similar trend was noted when pure water was used as the solvent, except that the best results (complete conversion with 2 mol-% Ru) were seen for 1,3-diphenylallyl alcohol, the most hydrophobic substrate.

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Reference£º
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. 15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), molecular formula is C20H16Cl2N4Ru. In a Article£¬once mentioned of 15746-57-3, SDS of cas: 15746-57-3

Electron-transfer chemistry of Ru-linker-(heme)-modified myoglobin: Rapid intraprotein reduction of a photogenerated porphyrin cation radical

We report the synthesis and characterization of RuC7, a complex in which a heme is covalently attached to a [Ru(bpy)3]2+ complex through a -(CH2)7- linker. Insertion of RuC7 into horse heart apomyoglobin gives RuC7Mb, a Ru(heme)-protein conjugate in which [Ru(bpy)3]2+ emission is highly quenched. The rate of photoinduced electron transfer (ET) from the resting (Ru2+/Fe 3+) to the transient (Ru3+/Fe2+) state of RuC7Mb is > 108 s-1; the back ET rate (to regenerate Ru2+/Fe3+) is 1.4 ¡Á 107 s-1. Irreversible oxidative quenching by [Co(NH3)5Cl] 2+ generates Ru3+/ Fe3+: the Ru3+ complex then oxidizes the porphyrin to a cation radical (P.+); in a subsequent step, P.+ oxidizes both Fe3+ (to give Fe IV=O) and an amino acid residue. The rate of intramolecular reduction of P.+ is 9.8 ¡Á 103 s-1; the rate of ferryl formation is 2.9 ¡Á 103 s-1. Strong EPR signals attributable to tyrosine and tryptophan radicals were recorded after RuC7MbM3+ (M = Fe, Mn) was flash-quenched/frozen.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.SDS of cas: 15746-57-3, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 15746-57-3, in my other articles.

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

37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 37366-09-9, category: ruthenium-catalysts

Water-soluble ruthenium(II) catalysts [RuCl2(eta6- arene)-{P(CH2OH)3}] for isomerization of allylic alcohols and alkyne hydration

The novel water-soluble ruthenium(II) complexes [RuCl 2(eta6-arene){P(CH2OH)3}] 2a-c and [RuCl(eta6-arene){P(CH2OH)3} 2][Cl] 3a-c have been prepared in high yields by reaction of dimers [{Ru(eta6-arene)(mu-Cl)Cl}2] (arene = C 6H6 1a, p-cymene 1b, C6Me6 1c) with two or four equivalents of P(CH2OH)3, respectively. Complexes 2/3a-c are active catalysts in the redox isomerization of several allylic alcohols into the corresponding saturated carbonyl compounds under water/n-heptane biphasic conditions. Among them, the neutral derivatives [RuCl2(eta6-C6H6){P(CH 2OH)3}] 2a and [RuCl2(eta6-p- cymene){P(CH2OH)3}] 2b show the highest activities (TOP values up to 600 h-1; TON values up to 782). Complexes 2/3a-c also catalyze the hydration of terminal alkynes.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.category: ruthenium-catalysts. In my other articles, you can also check out more blogs about 37366-09-9

Reference£º
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. 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2. In a Article£¬once mentioned of 37366-09-9, COA of Formula: C12H12Cl4Ru2

Ruthenium(II), rhodium(III) and iridium(III) based effective catalysts for hydrogenation under aerobic conditions

The new cationic mononuclear complexes [(eta6-arene)Ru(Ph-BIAN)Cl]BF4 [eta6-arene = benzene (1), p-cymene (2)], [(eta5-C5H5)Ru(Ph-BIAN)PPh3]BF4 (3) and [(eta5-C5Me5)M(Ph-BIAN)Cl]BF4 [M = Rh (4), Ir (5)] incorporating 1,2-bis(phenylimino)acenaphthene (Ph-BIAN) are reported. The complexes have been fully characterized by analytical and spectral (IR, NMR, FAB-MS, electronic and emission) studies. The molecular structure of the representative iridium complex [(eta5-C5Me5)Ir(Ph-BIAN)Cl]BF4 has been determined crystallographically. Complexes 1-5 effectively catalyze the reduction of terephthaldehyde in the presence of HCOOH/CH3COONa in water under aerobic conditions and, among these complexes the rhodium complex [(eta5-C5Me5)Rh(Ph-BIAN)Cl]BF4 (4) displays the most effective catalytic activity.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.COA of Formula: C12H12Cl4Ru2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 37366-09-9, in my other articles.

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

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), Computed Properties of C20H16Cl2N4Ru.

Exciton-like energy collection in an oligothiophene wire end-capped by Ru- and Os-polypyridine chompores

Ru(II)- and OS(Il)-polypyridine termini are linked by a quinquethiophene bridge (the inter-metal separation is ca. 1.9 nm) wherein excitation energy flows into the luminescent Os-based unit by way of a conductive level. The Royal Society of Chemistry 2005.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Computed Properties of C20H16Cl2N4Ru. In my other articles, you can also check out more blogs about 15746-57-3

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

15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), molecular formula is C20H16Cl2N4Ru, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 15746-57-3, Safety of Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II)

A 3-pyridyl-5,15-diazaporphyrin nickel(II) complex as a bidentate metalloligand for transition metals

3-Pyridyl-5,15-diazaporphyrin nickel(II) serves as a bidentate metalloligand for platinum(II), ruthenium(II), and rhenium(I) metal centers. Single-crystal X-ray diffraction analysis of these metal complexes unambiguously reveals the presence of a dative bond between the outer metal center and the meso-nitrogen atom. The UV/Vis absorption spectra of the complexes show substantially red-shifted bands which are perturbed by outer-metal coordination. This is due to the contribution of metal-to-ligand charge transfer interactions.

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

Related Products of 37366-09-9, An article , which mentions 37366-09-9, molecular formula is C12H12Cl4Ru2. The compound – Dichloro(benzene)ruthenium(II) dimer played an important role in people’s production and life.

METHOD FOR MANUFACTURING OPTICALLY ACTIVE COMPOUND

The present invention provides a method for manufacturing an optically active compound of formula (2), which contains bringing hydrogen into contact with a compound of formula (1) in the presence of a transition metal catalyst having an optically active ligand. In the formula, R1 represents a hydrogen atom or an acetyl group, R2, R3, R4, and R5 each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxy group, a nitro group, an amino group, or an acyl group, R6 represents an alkyl group, R7 and R8 each independently represents a hydrogen atom or an alkyl group, and a carbon atom marked with an asterisk (*) represents an asymmetric carbon atom.

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

Reference of 15746-57-3, 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.15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), molecular formula is C20H16Cl2N4Ru. In a patent, introducing its new discovery.

Synthesis and complexation of macrocycles containing two pyrazolone sub-units

The synthesis and characterization of several Ru(II) complexes with acyclic and macrocyclic ligands containing tautomerizable OH and fixed OCH3 5-pyrazolone heterocycles are described. From dipyrazolylmethane bidentate ligands L, RuL(bpy)2(PF6)2 and Ru(L-H+)(bpy)2PF6 complexes have been obtained. From the macrocycle with two CH3 and two OCH3 pyrazole sub-units, a series of complexes Ru(Mac)XY(PF6)2 (X,Y = DMSO, CH3CN, Py, Pz, dmPz) has been prepared. They show a behavior close to that of the analogous tetrapyrazole complexes but with slightly different complexing ability. In the case of the corresponding di OH macrocycle, coordination with Ru(DMSO)4Cl2 leads to unstable complexes.

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