Category: 10049-08-8

Electric Literature of 10049-08-8, 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.10049-08-8, Name is Ruthenium(III) chloride, molecular formula is Cl3Ru. In a patent, introducing its new discovery.

SPECTROPHOTOMETRIC DETERMINATION OF RUTHENIUM(III) AND RHODIUM(III) WITH 9,10-PHENANTHRENEQUINONE MONOXIME AFTER EXTRACTION INTO MOLTEN NAPHTHALENE.

9,10-Phenanthrenequinone monoxime has been used as a reagent for the spectrophotometric determination of ruthenium(III) and rhodium(III) after extraction into molten naphthalene. The extracted mixture of the metal complex and naphthalene was dissolved in chloroform and ruthenium and rhodium were determined spectrophotometrically. Beer’s law holds in the concentration range of 0. 2-4. 1 mu g/cm**3 for ruthenium and 0. 3-5. 3 mu g/cm**3 for rhodium in 10 cm**3 of the final solution. Interference of various ions has been studied and the method has been applied to the determination of ruthenium and rhodium in various synthetic mixtures. This procedure is also applied to the simultaneous determination of ruthenium and rhodium present together in a solution.

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

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Synthesis of binuclear amide complexes of Ru (III) and study of their catalytic activity in epoxidation of alkenes

Syntheses of the binuclear amide complexes of Ru (III) are described. The catalytic activity of the complexes, which are highly soluble in water, was examined by carrying out the epoxidations of norbornene, cis-cyclooctene and trans-octene to give the respective oxides in the presence of the oxidant iodosylbenzene. The reactions were monitored by UV-Vis and R spectroscopy and cyclic voltammetry, and the reaction mechanism elucidated.

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

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Post-coordination functionalisation of pyrazolyl-based ligands as a route to polynuclear complexes based on an inert RuIIN6 core

The simple mononuclear complex [Ru(H2bpp)2][PF 6]2 [H2bpp = 2,6-bis(pyrazol-3-yl)pyridine] contains four coordinated pyrazolyl ligands which each have a reactive NH site at the position adjacent to the coordinated N atom. Alkylation of these with either 2-[1-{4-(bromomethyl)benzyl}-1H-pyrazol-3-yl]pyridine or 4?-[(4-bromomethyl)phenyl]terpyridine allows attachment of four additional chelating groups, either bidentate pyrazolyl-pyridine and terdentate terpyridyl units, respectively, which are pendant from the central kinetically inert RuIIN6 complex core. These functionalised mononuclear complexes [Ru(L1)2][PF6]2 (with four pendant pyrazolyl-pyridine bidentate sites) and [Ru(L2) 2][PF6]2 (with four pendant terpyridyl sites) can be used as the starting point for polynuclear assemblies by attachment of additional labile metal ions as the secondary sites. As examples of this we prepared and structurally characterised the trinuclear complex [RuAg 2(L1)2][ClO4]4, an unusual example of a polynuclear helicate containing a kinetically inert metal centre, and the pentanuclear complex [RuCu4(MeCN)5(H 2O)1.5(L2)2](SbF6) 6(BF4)4 in which each of the pendant terpyridyl sites of the [Ru(L2)2]2+ core is coordinated to a Cu(ii) ion. The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

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

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Furanyl cyclic amines: A diastereoselective synthesis of 2,6-syn-disubstituted piperidines under thermodynamic control

Utilising the propensity of the 2-furanyl group to facilitate equilibration of an adjacent tosylamide chiral centre, a diastereoselective route to 2,6-syn-piperidines was developed that proceeds with high levels of thermodynamic stereocontrol. X-ray crystallography structures suggest that, as seen in similar systems, pseudo-allylic strain between the N-tosyl group and the substituents at the 2 and 6 positions dominates stereochemical preference, overriding 1,3 diaxial interactions. The Royal Society of Chemistry 2012.

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

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Preparation of ruthenium and osmium carbonyl complexes using microwave heating: demonstrating the use of a gas-loading accessory and real-time reaction monitoring by means of a digital camera

By using a gas-loading accessory, we show that it is possible to perform reactions involving gases and prepare organometallic complexes easily in good yields using microwave heating. The complexes Ru3(CO)12, H4Ru4(CO)12, and H2Os 3(CO)10 are prepared. Ligand substitution reactions of Ru3(CO)12 are also studied and, in the case of the reaction with triphenylphosphine, the reaction is monitored in real time by means of a digital camera interfaced with the microwave unit.

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

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Catalytic ester-amide exchange using group (IV) metal alkoxide-activator complexes

A process for preparation of amides from unactivated esters and amines has been developed using a catalytic system comprised of group (IV) metal alkoxides in conjunction with additives including 1-hydroxy-7-azabenzotriazole (HOAt). In general, ester-amide exchange proceeds using a variety of structurally diverse esters and amines without azeotropic reflux to remove the alcohol byproduct. Initial mechanistic studies on the Zr(Ot-Bu)4-HOAt system revealed that the active catalyst is a novel, dimeric zirconium complex as determined by X-ray crystallography.

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

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Synthesis, structural, spectral, thermal and antimicrobial studies of palladium(II), platinum(II), ruthenium(III) and iridium(III) complexes derived from N,N,N,N-tetradentate macrocyclic ligand

Palladium(II), platinum(II), ruthenium(III) and iridium(III) complexes of general stoichiometry [PdL]Cl2, [PtL]Cl2, [Ru(L)Cl 2]Cl and [Ir(L)Cl2]Cl are synthesized with a tetradentate macrocyclic ligand, derived from 2,6-diaminopyridine with 3-ethyl 2,4-pentanedione. Ligand was characterized on the basis of elemental analyses, IR, mass, and 1H NMR and 13C NMR spectral studies. All the complexes were characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, IR, mass, electronic spectral techniques and thermal studies. The value of magnetic moments indicates that all the complexes are diamagnetic except Ru(III) complex which shows magnetic moments corresponding its one unpaired electron. The macrocyclic ligand and all its metal complexes were also evaluated in vitro against some plant pathogenic fungi and bacteria to assess their biocidal properties.

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

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Vibrational spectroscopy of the electronically excited state. 5. Time-resolved resonance Raman study of tris(bipyridine)ruthenium(II) and related complexes. Definitive evidence for the “localized” MLCT state

Time-resolved resonance Raman (TR3) spectra of the emissive and photochemically active metal-to-ligand charge-transfer (MLCT) electronic states of Ru(bpy)32+, Os(bpy)32+, and related complexes are reported. These spectra are compared to those of complexes containing neutril bipyridine and bipyridine radical anion. In the Ru(bpy)32+ complex it is conclusively demonstrated that the realistic formulation of the MLCT state is [RuIII(bpy)2(bpy-?)]2+. This conclusion is reached by four lines of evidence: (i) large frequency shifts in bpy modes in the MLCT state, which approximate those observed upon one-electron chemical reduction of bpy to bpy-?; (ii) the TR3 spectrum observed upon saturation of the MLCT state, which exhibits peaks due to both neutral and radical-like bipyridine; (iii) precise frequencies of “unshifted” bpy modes in the MLCT state, which resemble RuIII(bpy)33+; and (iv) the frequency shifts observed in MLCT states of bis(bipyridine)ruthenium(II) complexes, which are essentially the same as those of the tris chelate. In Os(bpy)32+, criteria ii-iv above have not been successfully tested, but the magnitudes of the large excited state frequency shifts strongly suggest the formulation [OsIII(bpy)2(bpy-?)]2+ for the MLCT state of this complex.

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

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IMPROVED METHOD FOR SYNTHESIS OF ARENECYCLOPENTADIENYLRUTHENIUM CATIONS

An improved method for the synthesis of + salts by means of ligand exchange at ruthenocene is described.A set of new +X- was obtained.The 1H NMR spectra of arenecyclopentadienylruthenium salts were 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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Mechanism of carbon-nitrogen bond scission on unsupported transition metal sulfides

The reactivity of a series of amines with various structures and different numbers of hydrogen atoms on the carbon atoms in the alpha and beta position, with respect to the nitrogen atom, was examined on four transition metal sulfides, i.e. NbS3, MoS2, RuS2, and Rh2S3. It is shown that the reaction mechanism proceeds via an elimination or a nucleophilic substitution the relative importance of which depends on the structure of the substrate to be transformed and on the transition metal sulfides properties. NbS3 is the most active sulfide of the series for the elimination reaction due to its high acidity, but it is inactive for the nucleophilic substitution. On the other hand, the surface species of Rh2S3 can be involved in a nucleophilic substitution but not in an elimination reaction. The other sulfides of the series behave in between. These results clearly demonstrate that the catalysts intervene differently in the HDN mechanism. Moreover, for a given solid the structure of a nitrogen-containing molecule strongly affects the elementary steps of its transformation. Accordingly, a precise mechanistic study of the reactivity of a model molecule at the surface of a sulfide cannot be generalized to the overall HDN process which involves several types of molecules.

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