Tag: M.W:400-500

Synthetic Route of 15746-57-3. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II). In a document type is Article, introducing its new discovery.

The Preparation and Study of Bis(2-quinolyl) and Bis(2-[1,8]naphthyridyl) Derivatives of Pyrimidine and Pyrazine as Bridging Ligands for RuII

The 2:1 Friedlaender condensation of 2-aminobenzaldehyde or 2-aminonicotinaldehyde with either 4,6-diacetylpyrimidine or 2,5-diacetylpyrazine leads to a family of four new bis(bidentate) bridging ligands. Subsequent complexation of these ligands with [RuCl 2(bpy)2] (bpy = 2,2?-bipyridine) leads to the corresponding mononuclear and dinuclear mixed-ligand RuII complexes. Analysis of the 1H NMR spectra of these systems affords some insight into their conformational properties. Electronic spectra of the complexes evidence two long-wavelength absorption bands which correspond to typical metal-to-ligand charge transfer states. The energies of these states may be explained by electronegativities of the pendant rings on the bridging ligand as well as the substitution pattern on the central ring. For the dinuclear complexes the lowest energy absorption shows components associated with coordination to the pendant and the central rings. The appearance of two metal-based oxidations gives good evidence for strong intermetalic interaction and Koopman’s theorem is obeyed for all systems. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.

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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. 15746-57-3, C20H16Cl2N4Ru. A document type is Article, introducing its new discovery., category: ruthenium-catalysts

Photophysical study of DNA-bound complexes containing two covalently linked [Ru(2,2?-bipyridine)3]2+-like centers

The changes in the absorption, steady-state emission, and luminescent lifetime properties, upon binding of binuclear complexes of type [(bpy)2Ru(Mebpy)-(CH2)n-(bpyMe)Ru(bpy) 2]4+ (bpy = 2,2?-bipyridine; Mebpy-= 4-methyl-2,2?-bipyridine-4?-; 1b, n = 5; 1c, n = 7) to double-stranded DNA, have been compared relative to those for the monometallic analogue [Ru(bpy)2(Me2bpy)]2+ (1a) (Me2bpy = 4,4?-dimethyl-2,2?-bipyridine). Mc Ghee von Hippel analysis indicates that the binuclear complexes 1b and 1c bind more than 100 times as strongly to DNA as does 1a. Luminescence lifetime analysis in the presence and absence of DNA resolves at least two distinct binding modes which exhibit markedly different accessibility to oxygen and dissimilar behavior under physiological salt conditions. The binding to DNA by the binuclear complexes shows a much greater resistance to increased NaCl concentration relative to that of the monometallic complex, while plots of log Kobs versus log [Na+] indicate that for both the mononuclear and binuclear complexes electrostatic binding dominates. Absorption spectra measured reveal a complex mode of binding for the bimetallic complexes 1b and 1c under high-loading conditions (e.g., [nucleotide]: [ruthenium center] ? 1.)

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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.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, Quality Control of: Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II)

Synthesis and in vitro Toxicity of d-Glucose and d-Fructose Conjugated Curcumin?Ruthenium Complexes

A series of carbohydrate-conjugated bis(demethoxy)curcumin (BDC) ligands were synthesized by using the Huisgen copper(I)-catalyzed cycloaddition between azido-functionalized d-glucose and d-fructose as well as propargyl-modified BDC. The unprotected sugar ligands were treated with Ru(bpy)2Cl2to form curcumin-conjugated Ru complexes of general formula Ru(bpy)2(L)Cl. The ligands as well as Ru complexes were analyzed by NMR, IR, UV/Vis, and fluorescence spectroscopy, mass spectrometry as well as by elemental analysis (EA). Incubation of L929, HepG2 and the breast cancer cell line MDA-MB-231 revealed lower cytotoxicity of all carbohydrate-conjugated ligands compared with BDC. The Ru complexes exhibited higher cytotoxicity than the parent ligands, in particular against HepG2 cells, whereas the noncancerous L929 cell line remained unaffected. Unexpectedly, the d-fructose-conjugated ligand and its corresponding Ru complex did not show any significant toxicity against MDA-MB-231 cells.

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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. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer

Ruthenium-catalyzed oxidative homocoupling of arylboronic acids in water: Ligand tuned reactivity and mechanistic study

Molecular catalysts based on water-soluble arene-Ru(II) complexes ([Ru]-1-[Ru]-5) containing aniline (L1), 2-methylaniline (L2), 2,6-dimethylaniline (L3), 4-methylaniline (L4), and 4-chloroaniline (L5) were designed for the homocoupling of arylboronic acids in water. These complexes were fully characterized by 1H, 13C NMR, mass spectrometry, and elemental analyses. Structural geometry for two of the representative arene-Ru(II) complexes [Ru]-3 and [Ru]-4 was established by single-crystal X-ray diffraction studies. Our studies showed that the selectivity toward biaryls products is influenced by the position and the electronic behavior of various substituents of aniline ligand coordinated to ruthenium. Extensive investigations using 1H NMR, 19F NMR, and mass spectral studies provided insights into the mechanistic pathway of homocoupling of arylboronic acids, where the identification of important organometallic intermediates, such as sigma-aryl/di(sigma-aryl) coordinated arene-Ru(II) species, suggested that the reaction proceeds through the formation of crucial di(sigma-aryl)-Ru intermediates by the interaction of arylboronic acid with Ru-catalyst to yield biaryl products.

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

Application of 15746-57-3. 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)

Polynuclear complexes of Ru(ll) based on the octadentate ligand 5,5′-bis(2-pyridyl)-3,3′-bi(1,2,4-triazole) (BPBT): Synthesis, spectroscopic and photophysical properties

The synthesis and characterization of the redox and excited state properties of three complexes (Ru(bpy)2(bpbtH2)2+, [Ru(bpy)2]2(bpbtH2)4t and [Ru(bpy)2]3(bpbt)4+) derived from the title ligand “bpbt” are reported. The coordination of the Ru(bpy)2 unit is believed to occur via N1 of the triazole and the pyridine nitrogen in the mononuclear and binuclear complexes. In the trinuclear complex the third unit is linked via N1 and N4′ of the bis(triazole) part of the ligand. Electrochemical studies of the mono-, bi- and trinuclear complexes show one, two and three one-electron oxidations(s) of the Ru-center(s). On the reduction side, up to -2.0 V only reduction of the spectator ligands bpy can be observed, each as two waves involving one, two and three electrons in the mono-, bi- and trinuclear complexes, respectively. FAB mass spectral data and fragmentation patterns of the binuclear complex are discussed. Mixed-valence forms of the bi- and trinuclear complexes can be prepared by chemical oxidation and these show strong absorption in the infra-red region corresponding to intervalence (IT) transitions. Analysis of the IT bands shows that the extent of electron delocalization is quite high in both cases, suggesting a fairly strong metal-metal interaction. The lowest excited state in all cases involves charge transfer from Ru(ll) to the bipyridine ligands, Ru(ll)->bpy. All three complexes show emission in solution at ambient temperature. The absorption and emission properties are sensitive to solution pH. Laser flash photolysis studies show a strong intensity dependence for the luminescence and transient absorptions and this is attributed to excited state annihilation processes, possibly via electron transfer. CNRS-Gauthier-VilIars.

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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 Patent£¬once mentioned of 37366-09-9, COA of Formula: C12H12Cl4Ru2

ORGANOMETALLIC COMPOUNDS FOR THE MANUFACTURE OF A SEMICONDUCTOR ELEMENT OR ELECTRONIC MEMORY

The invention relates to compounds in accordance with the general formula [Ru(arene)(Ra-N=CR1-CR3=N-Rb)] or [Ru(arene)((Rc,Rd)N-N=CRH1-CRH3=N-N(Re,Rf))]. In this case, arene is selected from the group consisting of mononuclear and polynuclear arenes and heteroarenes. R1, R3, RH1, RH3 and Ra – Rf are independently selected from the group consisting of H, an alkyl radical (C1 – C10) and an aryl radical. It further relates to methods for the production of these compounds, compounds obtainable according to these methods, their use and a substrate having on a surface thereof a ruthenium layer or a layer containing ruthenium. In addition, the invention relates to a method for producing compounds [Ru(arene)X2]2, wherein arene is selected from the group consisting of mononuclear and polynuclear arenes and X = halogen, compounds of this type obtainable according to this method, and their use. The aforementioned ruthenium(O) compounds can be produced in a simple, cost- effective and reproducible manner with a high degree of purity and good yield. Due to their high degree of purity, they are suitable for use as ruthenium(O) precursors.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.COA of Formula: C12H12Cl4Ru2. 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

Application of 15746-57-3. 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)

Room-Temperature Molten Salts of Ruthenium Tris(bipyridine)

Attaching poly(ethylene glycol)-mono(methyl ether) (MW 350) chains to [Ru(bpy)3]2+ complexes via 4,4?- bipyridine ester linkages produces room temperature, highly viscous, molten salt forms of this well-known complex. This paper describes the synthesis and properties of a series of such complexes bearing two, four, or six polyether chains. Differential scanning calorimetry, rheometry, microelectrode voltammetry, and ac impedance spectroscopy were used to determine the dependence of physical and transport properties of the Ru complex melts on the number of polyether tails. The coupling of electron hopping and physical diffusion in voltammetrically generated mixed-valent layers is analyzed using the Dahms-Ruff relationship, yielding self-exchange rate constants, kex, for the Ru(III/II) and Ru(II/I) couples. An activation analysis shows that these reactions are adiabatic, or nearly so, and the slowing of their rates relative to that of the parent [Ru(bpy)3]2+ complex in fluid solutions is caused by large thermal barriers.

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

Reference of 37366-09-9. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer

Synthesis of half sandwich platinum group metal complexes containing pyridyl benzothiazole hydrazones: Study of bonding modes and antimicrobial activity

Pyridyl benzothiazole hydrazone derivatives containing ruthenium, rhodium and iridium complexes have been synthesized, characterized and evaluated for antimicrobial activity. Metal precursors of the type [(arene)RuCl2]2(arene = p-cymene, benzene), [Cp?MCl2]2 (M = Rh/Ir) and pyridyl benzothiazole hydrazone ligands (L1 and L2) have been employed in this work. Complexes containing ligands L1 in 1:2 (M:L) ratio yielded only one type of cationic mononuclear complexes whereas ligand L2 in 1:2 (M:L) ratio yielded two types of cationic mononuclear complexes. In same manner ligand L2 in 1:1 (M:L) ratio also yielded two types of binuclear complexes with different modes of binding. All these complexes have been characterized by analytical, spectroscopic and single-crystal X-ray diffraction studies. Antibacterial studies of ligands and complexes have been carried out and were found to exhibit potent activity towards gram-positive and gram-negative bacteria.

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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 15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II),molecular formula is C20H16Cl2N4Ru, is a conventional compound. this article was the specific content is as follows.Computed Properties of C20H16Cl2N4Ru

Variable oxidation state sulfur-bridged bithiazole ligands tune the electronic properties of ruthenium(ii) and copper(i) complexes

The synthesis of homoleptic and heteroleptic ruthenium(ii) and copper(i) complexes containing sulfur-bridged bithiazole ligands of varying oxidation states are reported. The complexes have been characterized using 1D and 2D NMR spectroscopy, X-ray single crystal diffraction, electrochemistry, UV-vis absorbance and fluorescence spectroscopy. The stability, photophysical and electrochemical properties were found to be dependent on the oxidation state of the non-coordinating sulfur. The ruthenium and copper species were found to be non-emissive in solution at room temperature, though all displayed weak emission when doped in a PMMA matrix, which increased in intensity on cooling to 77 K. The electrochemical HOMO-LUMO gap was found to be dependent on the oxidation state of the sulfur in the bridging ligand in all complexes, illustrating an additional handle for tuning electrochemical properties.

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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

Ruthenium complexes of triazole-based scorpionate ligands transfer hydrogen to substrates under base-free conditions

The first ruthenium complexes of bulky tris(triazolyl)borate (Ttz) ligands were synthesized, fully characterized, and studied as transfer hydrogenation catalysts. The structures of the complexes were (eta6-arene)RuCl(N, N), where in each case N,N is a kappa2-Ttz or bis(triazolyl)borate (Btz) ligand (arene = p-cymene (1, 3, 5, 6), benzene (2), C6Me 6 (4); N,N = TtzPh,Me* (1, 2), TtzMe,Me (3, 4), Ttz (5), Btz (6)). All but 5 were crystallographically characterized, and notably for 1 and 2 a rearranged ligand structure is observed (as indicated by an asterisk). These complexes were all effective catalysts for transfer hydrogenation of aryl ketones in isopropyl alcohol with base co-catalyst, with rates that were accelerated by moisture-free conditions. Complexes 1 and 2 are also effective catalysts for base-free transfer hydrogenation, and with 1 hydrogenation of several base-sensitive substrates was demonstrated. The ability of 1 to serve as a hydrogenation catalyst without base is attributed primarily to steric bulk, and a preliminary mechanism for formation of that active catalyst is proposed.

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