Category: 15746-57-3

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

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

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

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)

BINUCLEAR METAL COMPLEX, METAL COMPLEX DYE, PHOTOELECTRIC TRANSDUCER AND PHOTOCHEMICAL BATTERY

A novel binuclear metal complex according to the present invention is an asymmetric binuclear metal complex represented by the general formula: (L1)2M1(BL)M2(L2)2(X)n, wherein M1 and M2, which may be identical or different, represent a transition metal; L1 and L2, which are different, represent a chelate ligand capable of polydentate coordination and two L1s may be different and two L2s may be different; BL represents a bridge ligand having at least two heteroatom-containing cyclic structures, the heteroatoms contained in the cyclic structures being ligand atoms coordinating to M1 and M2; X represents a counter ion; and n is the number of counter ions needed to neutralize the charge of the complex. And the binuclear metal complex is useful as a metal complex dye.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Safety of Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II). In my other articles, you can also check out more blogs about 15746-57-3

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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, COA of Formula: C20H16Cl2N4Ru

Metal-assisted racemization of the atropisomers of a E,A-binaphthyl skeleton via a syn transition state

Delta/A-(delta/lambda-1,1?-Biisoquinoline)bis(2,2?- bipyridine)ruthenium(II) bis(hexafluorophosphate) (2) exists as an ?3:1 mixture of its two diastereomeric forms in acetone solutions at 25 C. The major isomer, (Delta,delta/A,lambda)-2, crystallizes in the monoclinic space group C2/c with Z = 8, a = 29.12(1), b = 18.593(7), and c = 17.85(1) A, beta= 127.81(4), R = 0.053, and Rw = 0.062 at 25 C. As expected, the 1,1?-biisoquinoline ligand is nonplanar, which is a result of a transannular steric interaction between H8 and H8?. Diastereomerically pure samples of 2 were found to isomerize rapidly in solution at room temperature in the absence of light to give a thermodynamic mixture of the two diastereomers. The rate data for the latter equilibrium at 80 C are K = 2.89, k(6amaj?6amin) = 12.7(3) s-1, and k(6amin?6amaj) = 36.6(9) s-1. The activation parameters were determined in the temperature range of 50-90 C: DeltaH? (maj?min) = 68.7 kJ mol-1, DeltaS?(maj?min) = -21 J K-1 mol-1, DeltaH?(min?maj) = 66.1 kJ mol-1, and DeltaS?(min?maj) = -38 J K-1 mol-1. Spin saturation transfer (SST), spin inversion transfer (SIT), and two-dimensional exchange spectroscopy (2D EXSY) NMR experiments using 2 and its 2,2?-bipyridine-d8 analogue demonstrate that the interconversion of the two diastereomers is the result of an intramolecular process of C2 symmetry that does not change the cis/trans relationship between the 1,1?-biisoquinoline and 2,2?-bipyridine ligands. Irregular mechanisms that involve breaking just one of the ruthenium-isoquinoline bonds have been ruled out because the rate of isomerization of a water-soluble derivative of 2, Delta/A-(delta/lambda-1,1?-biisoquinoline)bis(2,2?-bipyridine) ruthenium(II)dichloride, is essentially the same in D2O containing 1 M LiCl (k(6amaj?6amin) = 5.7(2) s-1) and 1 M DC1 (k(6amaj?6amin) = 7.1(1) s-1) at 80 C. We therefore conclude that interconversion of the two diastereoisomers of 2 takes place by a regular mechanism that involves atropisomerization of the eta2-1,1?-biisoquinoline ligand via a syn transition state.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.COA of Formula: C20H16Cl2N4Ru, you can also check out more blogs about15746-57-3

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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, Product Details of 15746-57-3

Controlling ground and excited state properties through ligand changes in ruthenium polypyridyl complexes

The capture and storage of solar energy requires chromophores that absorb light throughout the solar spectrum. We report here the synthesis, characterization, electrochemical, and photophysical properties of a series of Ru(II) polypyridyl complexes of the type [Ru(bpy)2(N-N)]2+ (bpy = 2,2-bipyridine; N-N is a bidentate polypyridyl ligand). In this series, the nature of the N-N ligand was altered, either through increased conjugation or incorporation of noncoordinating heteroatoms, as a way to use ligand electronic properties to tune redox potentials, absorption spectra, emission spectra, and excited state energies and lifetimes. Electrochemical measurements show that lowering the phi* orbitals on the N-N ligand results in more positive Ru3+/2+ redox potentials and more positive first ligand-based reduction potentials. The metal-to-ligand charge transfer absorptions of all of the new complexes are mostly red-shifted compared to Ru(bpy)32+ (lambdamax = 449 nm) with the lowest energy MLCT absorption appearing at lambdamax = 564 nm. Emission energies decrease from lambdamax = 650 nm to 885 nm across the series. One-mode Franck-Condon analysis of room-temperature emission spectra are used to calculate key excited state properties, including excited state redox potentials. The impacts of ligand changes on visible light absorption, excited state reduction potentials, and Ru3+/2+ potentials are assessed in the context of preparing low energy light absorbers for application in dye-sensitized photoelectrosynthesis cells.

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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, structure, redox activity and spectroscopic properties of ruthenium(II) complexes with 3,5-bis(benzothiazol-2-yl)pyrazole, 3,5-bis(benzimidazol-2-yl)pyrazole and 2,2′-bipyridine as co-ligands

Ruthenium(II) complexes of composition <(bipy)2Ru(Hpzbzth)>2*3H2O 1, <(bipy)2Ru(pzbzth)>*2H2O 2, <(bipy)2Ru(pzbzth)Ru(bipy)2>3*H2O 3, <(bipy)2Ru(H3pzbzim)>2*2H2O 4 and <(bipy)2Ru(Hpzbzim)>*2H2O 5, where Hpzbzth=3,5-bis(benzthiazol-2-yl)pyrazole, H3pzbzim=3,5-bis(benzimidazol-2-yl)pyrazole and bipy=2,2′-bipyridine, have been synthesized and characterized. The crystal structure of 3, in which the two metal centres are bridged by the pyrazolate moiety of the pzbzth anion, has been determined. The two RuN6 chromophores in this complex are separated by 4.723(3) Angstroem. From the significant down-field shift of the pyrazolate CH proton in 3 (8.92 ppm) with respect to 1 (7.78 ppm) and 4 (7.82 ppm), the involvement of S…H(C)…S type interaction in 3 has been proposed. The equilibrium constants of the species involving dissociation of the NH protons of the bridging ligand and the change in the oxidation state of ruthenium from +2 to +3 have been determined in acetonitrile-water (3:2) by cyclic voltammetric and spectrophotometric methods. Redox titrations of complexes 1, 3 and 4 by cerium(IV) have revealed that the disappearance of the metal-to-ligand charge transfer band is accompanied by the appearance of the ligand-to-metal charge transfer band at higher wavelengths. In the case of 3, when 1 equivalent of cerium(IV) is added, the mixed-valence Ru(II)Ru(III) species is generated which exhibits an absorption maximum at 950 nm due to the intervalence-transfer transition. The luminescence spectral behaviour of complexes 1-4 has been examined in methanol-ethanol (1:4) solution (at 300 K) as well as in glassy state (at 77 K).

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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. 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)

Photogeneration of Carbon Monoxide and of Hydrogen via Simultaneous Photochemical Reduction of Carbon Dioxide and Water by Visible-Light Irradiation of Organic Solutions Containing Tris(2,2′-bipyridine)ruthenium(II) and Cobalt(II) Species as Homogeneous Catalysts

CO and H2 are photogenerated simultaneously by visible-light irradiation of systems containing a photosensitizer, the 2+ complex, Co(II) species as homogeneous catalysts, which mediate CO2 and H2O reduction by intermediate formation of Co(I), a tertiary amine as electron donor, which provides the electrons for the reduction, and an organic solvent which also facilitates dissolution of CO2.The efficiency of (CO + H2) gas production and the selectivity CO/H2 markedly depend upon the composition of the medium, the nature of the tertiary amine, the solvent, and the ligand of the Co ions. 2,9-Dimethyl-1,10-phenanthroline is particularly effective in promoting CO and H2 formation, giving a quantum yield of 7.7percent in (CO + H2)(1.2percent for CO and 6.5percent for H2).The process consists of two catalytic cycles: a photocatalytic cycle for the Ru complex and a double dark reaction pathway for the Co species; oxidative and/or reductive quenching of the excited state of the photosensitizer lead to the formation of Co(I) species which reduce either CO2 or H2O to CO or H2, respectively.

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

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Modular synthesis of simple cycloruthenated complexes with state-of-the-art performance in p-type DSCs

A modular approach based on Suzuki-Miyaura cross coupling and Miyaura borylation has been used to prepare two cyclometallated [Ru(N N)2(C N)]+ complexes which possess either a carboxylic or phosphonic acid group attached via a phenylene spacer to the 4-position of the pyridine ring in the C N ligand. The key intermediate in the synthetic pathway is [Ru(bpy)2(1)]+ where bpy = 2,2?-bipyridine and H1 is 4-chloro-2-phenylpyridine. The crystal structure of [Ru(bpy)2(1)][PF6] is presented. Reaction of [Ru(bpy)2(1)][PF6] with 4-carboxyphenylboronic acid leads to [Ru(bpy)2(H6)][PF6], while the phosphonic acid analogue is isolated as the zwitterion [Ru(bpy)2(H5)]. The cyclometallated complexes have been characterized by mass spectrometry, multinuclear NMR spectroscopy, absorption spectroscopy and electrochemistry. [Ru(bpy)2(5)] adsorbs onto NiO FTO/NiO electrodes (confirmed by solid-state absorption spectroscopy) and its performance in p-type dye-sensitized solar cells (DSCs) has been compared to that of the standard dye P1; two-screen printed layers of NiO give better DSC performances than one layer. Duplicate DSCs containing [Ru(bpy)2(H5)] achieve short-circuit current densities (JSC) of 3.38 and 3.34 mA cm-2 and photoconversion efficiencies (eta) of 0.116 and 0.109%, respectively, compared to values of JSC = 1.84 and 1.96 mA cm-2 and eta = 0.057 and 0.051% for P1. Despite its simple dye structure, the performance of [Ru(bpy)2(H5)] parallels the best-performing cyclometallated ruthenium(ii) dye in p-type DSCs reported previously (He et al., J. Phys. Chem. C, 2014, 118, 16518) and confirms the effectiveness of a phosphonic acid anchor in the dye and the attachment of the anchoring unit to the pyridine (rather than phenyl) ring of the cyclometallating ligand.

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

A Novel Conjugate of Bis[((4-bromophenyl)amino)quinazoline], a EGFR-TK Ligand, with a Fluorescent Ru(II)-Bipyridine Complex Exhibits Specific Subcellular Localization in Mitochondria

The epidermal growth factor receptor (EGFR) is a key target in anticancer research, whose aberrant function in malignancies has been linked to severe irregularities in critical cellular processes, including cell cycle progression, proliferation, differentiation, and survival. EGFR mutant variants, either transmembrane or translocated to the mitochondria and/or the nucleus, often exhibit resistance to EGFR inhibitors. The ability to noninvasively image and quantify EGFR provides novel approaches in the detection, monitoring, and treatment of EGFR-related malignancies. The current study aimed to deliver a new theranostic agent that combines fluorescence imaging properties with EGFR inhibition. This was achieved via conjugation of an in-house-developed ((4-bromophenyl)amino)quinazoline inhibitor of mutant EGFR-TK, selected from a focused aminoquinazoline library, with a [Ru(bipyridine)3]2+ fluorophore. A triethyleneglycol-derived diamino linker featuring (+)-ionizable sites was employed to link the two functional moieties, affording two unprecedented Ru conjugates with 1:1 and 2:1 stoichiometry of aminoquinazoline to the Ru complex (mono-quinazoline-Ru-conjugate and bis-quinazoline-Ru-conjugate, respectively). The bis-quinazoline-Ru-conjugate, which retains an essential inhibitory activity, was found by fluorescence imaging to be effectively uptaken by Uppsala 87 malignant glioma (grade IV malignant glioma) cells. The fluorescence imaging study and a time-resolved fluorescence resonance energy transfer study indicated a specific subcellular distribution of the conjugate that coincides with that of a mitochondria-targeted dye, suggesting mitochondrial localization of the conjugate and potential association with mitochondria-translocated forms of EGFR. Mitochondrial localization was further documented by the specific concentration of the bis-quinazoline-Ru-conjugate in a mitochondrial isolation assay.

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