Category: 15746-57-3

Related Products of 15746-57-3, An article , which mentions 15746-57-3, molecular formula is C20H16Cl2N4Ru. The compound – Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II) played an important role in people’s production and life.

The photophysical behavior of the transition metal complexes <<(bpy)2Ru>2(bphb)>(PF6)4, <<(tpy)(CN)Ru>2(bphb)>(PF6)2, and <(bpy)2Ru(bphp)Ru(tpy)(CN)>(PF6)4 (bpy = 2,2′-bipyridine, tpy = 2,2′,6′,2”-terpyridine, bphb = 1,4-bis(2,2′-bipyrid-4-yl)benzene) was investigated in acetonitrile solution and low-temperature glasses.Luminescence spectra, excitation spectra, and transient absorption decays of the three complexes serve to show that intramolecular electronic energy transfer from the MLCT excited state of the <(bpy)2Ru(bphb) chromophore to the MLCT state of the tpy-containing chromophore occurs in the unsymmetric bimetallic complex.Nearly complete energy transfer from the <(bpy)2Ru(bphb)> chromophore to the tpy-containing chromophore was observed even in 4:1 ethanol:methanol glasses at 20 K.A semiclassical exchange energy transfer mechanism was used to treat the available data; the Franck-Condon weighted density of states (FCWD) was obtained using parameters determined from fits of luminescence spectra.Given the FCWD at room temperature and the experimental rate constant, an electronic coupling matrix element of approximately 60 cm-1 was determined for this system.

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

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Two new bipyridine ligands containing, respectively, two and four pyrene units were prepared. The obtained compounds were employed to synthesize new pyrene labeled ruthenium (II) trisbipyridine complex as well as a pyrene labeled ruthenium (II) trisbipyridine cored dendrimer. The obtained bipyridine ligands and the ruthenium complexes were characterized by NMR spectroscopy and MALDI-TOF mass spectroscopy. The optical and photophysical properties of the luminescent macromolecules were studied by absorption and fluorescence spectroscopy. It was noticed that the absorption spectra of the obtained complexes correspond to the sum of the absorption spectra of their components, which indicates a lack of interaction in the ground state. Efficient energy transfer was observed from pyrene units to the metal complex core resulting in the observation of the characteristic ruthenium bipyridine emission band upon excitation at the pyrene absorption wavelength. Moreover, efficient protection to oxygen quenching was remarked in the first generation dendrimer.

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

Electric Literature of 15746-57-3, An article , which mentions 15746-57-3, molecular formula is C20H16Cl2N4Ru. The compound – Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II) played an important role in people’s production and life.

In an effort to explore new systems with highly reducing excited states, we prepared a series of Ru(II) complexes of the type Ru(L)2quo1 (L = bpy (2,2?-bipyridine), phen (1,10-phenanthroline), dmphen (4,7-dimethyl-l,10-phenanthroline), tmphen (3,4,7,8-tetramethyl-l,10-phenanthroline); quo- = 8-quinolate) and investigated their photophysical and redox properties. The absorption and emission spectra of the Ru(L)2quo+ are significantly red-shifted relative to those of the parent complexes Ru(L)32+, with emission maxima in the 757-783 nm range in water. The Ru(L)2quo+ systems are easily oxidized with E1/2(RuIII/III) values ranging from +0.62 to +0.70 V vs NHE, making the emissive Ru ? phen MLCT (metal-to-ligand charge transfer) excited states (E00 ? 1-95 eV in CH3CN) of the Ru(L)2quo+ complexes significantly better reducing agents than the MLCT states of the parent Ru(L)32+ complexes. Emission lifetimes of 17.0 and 32.2 ns were measured for Ru(phen)2quo+ in water and acetonitrile, respectively, and 11.4 ns for Ru(bpy)2quo+ in water. Transient absorption results are consistent with the formation of reduced methyl viologen upon Ru(phen)2quo+ excitation with visible light in water. The possibility of observing the Marcus inverted region in the forward bimolecular electron transfer reaction from the highly reducing*Ru(phen)2quo+ excited state was explored with neutral electron acceptors with reduction potentials ranging from +0.25 to -1.15 V vs NHE.

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

Related Products 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)

Pyrazin-2-yl 2-pyridyl sulfide (pzpys) has been prepared by reaction of 2-sulfanylpyridine with chloropyrazine. As shown by 1H NMR spectroscopy, its major isomer has two binding sites which are inequivalent, one chelating through the N1-pyrazine and N-pyridine atoms, the other monodentate through the N4 atom of the pyrazine ring. By reaction of pzpys with [RuL2(NO)(NO2)][PF6]2 [(L = 2,2?-bipyridine (bipy) or di-2-pyridyl sulfide (dps)] the mononuclear complexes [RuL2(pzpys)(NO2)][PF6] have been obtained in which pzpys is the monodentate. The reactions of pzpys with cis-[RuL2Cl2] complexes [L = bipy, 1,10-phenanthroline (phen) or dps] have been studied. The dps derivative reacts with a large excess of pzpys affording [Ru(dps)2(pzpys)Cl]-[PF6] in which pzpys is monodentate. On the contrary the bipy and phen (L) derivatives, under the same experimental conditions, undergo substitution of both chloride ligands giving, as major products, [RuL2(pzpys)][PF6]2 in which pzpys is chelated. When the reactions were carried out in the presence of a stoichiometric amount of pzpys the binuclear complexes [L2Ru(pzpys)RuL2Cl][PF6]3 (L = bipy or phen) were slowly formed. The mononuclear complexes have been used as ligands in the reactions with [Ru-(bipy)2Cl2] giving the new binuclear species [L2Ru(pzpys)RuL2(NO2)][PF6] 3 (L = bipy or phen). The compounds have been fully characterized by infrared, UV/VIS, 1H and 13C NMR spectroscopies. In acetonitrile solution [Ru(bipy)2(pzpys)Cl][PF6] undergoes a reversible RuII ? RuIII electron transfer. In contrast, the one-electron oxidation of [Ru(dps)2(pzpys)Cl][PF6], [Ru(bipy)2(pzpys)(NO2)][PF6] and [Ru(bipy)2(pzpys)][PF6]2 is complicated by subsequent chemical reactions. The binuclear complex [(bipy)2Ru(pzpys)Ru(bipy)2Cl][PF6]3 undergoes two consecutive one-electron oxidations (DeltaE?? = 0.55 V), which allow the corresponding RuIIRuIII species to be classified as a completely delocalized (Class III) mixed-valence compound.

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Reference：
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, name: Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II)

Ru(II)-complex-based DNA photocleavers have been extensively studied for their potential application in photodynamic therapy (PDT) and photodynamic antimicrobial chemotherapy (PACT). However, their MLCT absorption maxima are generally shorter than 600 nm, limiting PDT/PACT application severely. In this work, by incorporating a 5-chloro-8-oxyquinolate-based noninnocent ligand into a merocyanine scaffold Cl-7-IVQ, we obtained a new Ru complex of this ligand, [Ru(bpy)2(Cl-7-IVQ)]2+, which has intense absorption in the window 600-700 nm and enables an efficient ?OH-mediated DNA photocleavage. This long-wavelength absorption band has a character of MLLCT transition from the hybrid Ru(dpi)-Cl-7-IVQ(pi) orbital to the pi*(Cl-7-IVQ) orbital and thus a contribution from the pipi* transition of the merocyanine framework, which endows the complex with a molar extinction coefficient as high as 1.73 × 104 M-1 cm-1 at 649 nm and allows for an efficient DNA photocleavage under an irradiation of low intensity. [Ru(bpy)2(Cl-7-IVQ)]2+ represents the first Ru(II)-complex-based DNA photocleaver that has an MLCT absorption maximum above 600 nm and can selectively inactivate E. coli bacterial cells over HeLa cells upon red light irradiation.

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

Electric Literature 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.

The chemical shifts of K(alpha2), K(alpha1), K(beta3) and K(beta1) lines are measured and analyzed. The Mo, Tc, and Ru compounds, including the metal clusters, are represented diagrammatically on the following coordinates: the chemical shifts of the centers of gravity of the K(alpha1,2) and K(beta1,3) doublets and the changes Q(5s) and Q(4d) in the relative partial charges. The compounds are distributed in a regular manner, thereby allowing one to reveal some specific features in the electronic states of transition-element atoms, including those peculiarities associated with the M-M interactions.

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

Electric Literature of 15746-57-3, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 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

We have used a novel microwave-assisted method developed in our laboratories to synthesize a series of ruthenium-thiosemicarbazone complexes. The new thiosemicarbazone ligands are derived from benzo[d][1,3]dioxole-5- carbaldehyde (piperonal) and the complexes are formulated as [(diimine) 2Ru(TSC)](PF6)2 (where the TSC is the bidentate thiosemicarbazone ligand). The diimine in the complexes is either 2,2?-bipyridine or 1,10-phenanthroline. The complexes have been characterized by spectroscopic means (NMR, IR and UV-Vis) as well as by elemental analysis. We have studied the biophysical characteristics of the complexes by investigating their anti-oxidant ability as well as their ability to disrupt the function of the human topoisomerase II enzyme. The complexes are moderately strong binders of DNA with binding constants of 104 M -1. They are also strong binders of human serum albumin having binding constants on the order of 104 M-1. The complexes show good in vitro anticancer activity against human colon cancer cells, Caco-2 and HCT-116 and indeed show some cytotoxic selectivity for cancer cells. The IC50 values range from 7 to 159 muM (after 72 h drug incubation). They also have antibacterial activity against Gram-positive strains of pathogenic bacteria with IC50 values as low as 10 muM; little activity was seen against Gram-negative strains. It has been established that all the compounds are catalytic inhibitors of human topoisomerase II.

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Reference：
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), Product Details of 15746-57-3.

The synthesis of di- and trinuclear ruthenium(II) complexes is reported, where each metal center has a tris-(bidentate) octahedral coordination sphere with predetermined stereochemistry. New members of the “Chiragen” ligand series, consisting of two linked chiral 4,5-pineno-2,2?-bipyridine groups, have been prepared, with small spacer units between the coordination centers (-(CH2)n {n= 0, 3} and -CH2(bpy)CH2-). X-ray structural data were obtained for the ligand Chiragen[3]. (Crystal data: orthorhombic, space group P212121, a = 12.229(1) A, b = 12.790(1) A, c = 20.215(1) A, V = 3161.8(4) A3, Z = 4.) Combination of the ligands with Ru(bpy)2Cl2 (where bpy is 2,2?-bipyridine) led to a mixture of diastereomers, while the use of enantiomerically pure Delta- or A-[Ru(bpy)2(py)2](dibenzoyltartrate) or Delta-Ru(CG[w-xyl])Cl2 led to almost complete stereoselectivity in the products. Circular dichroism spectra show that the complexes are composed of one helical diastereomer, with the expected absolute configuration predetermined by the chiral building block used. Additionally, 1H-NMR spectroscopy indicates C2 point group symmetry for the structures in solution, confirming the absence of DeltaDelta diastereomers.

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

Reference：
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), Safety of Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II).

Aromatic ring amination reactions in the ruthenium complex of 2-(phenylazo)pyridine is described. The substitutionally inert cationic brown complex [Ru(pap)3](ClO4)2 (1) (pap = 2-(phenylazo)pyridine) reacts smoothly with aromatic amines neat and in the presence of air to produce cationic and intense blue complexes [Ru(HL2)3](ClO4)2 (2) (HL2 = 2-[(4-(arylamino)phenyl)azo]pyridine). These were purified on a preparative TLC plate. The X-ray structure of the new and representative complex 2c has been solved to characterize them. The results are compared with those of the starting complex, [Ru(pap)3](ClO4)2 (1). The transformation 1 ? 2 involves aromatic ring amination at the para carbon (with respect to the diazo function) of the pendant phenyl rings of all three coordinated pap ligands in 1. The transformation is stereoretentive, and the amination reaction is regioselective. The extended ligand HL2 coordinates as a bidentate ligand and chelates to ruthenium(II) through the pyridine and one of the azo nitrogens. The amine nitrogen of this bears a hydrogen atom and remains uncoordinated. Similarly, the amination reaction on the mixed-ligand complex [Ru(pap)(bpy)2](ClO4)2 produces the blue complex [Ru(HL2)(bpy)2](ClO4)2 (3) as anticipated. The reactions of [RuCl2(dmso)4] and [Ru(S)2(L)2]2+ (dmso = dimethyl sulfoxide, S = labile coordinated solvent, L = 2,2?-bipyridine (bpy) and pap) with the preformed HL2 ligand have been explored. The structure of the representative complex [RuCl2(HL2a)2] (5a) is reported. It has the chlorides in trans configuration while the pyridine as well as azo nitrogens are in cis geometry. Optical spectra and redox properties of the newly synthesized complexes are reported. All the ruthenium complexes of HL2 are characterized by their intense blue solution colors. The lowest energy transitions in these complexes appear near 600 nm, which have been attributed to intraligand charge-transfer transitions. For example, the lowest energy visible range transition in [Ru(HL2b)3]2+ appears at 602 nm and its intensity is 65 510 M-1 cm-1. All the tris chelates show multiple-step electron-transfer processes. In [Ru(HL2)3]2+, six reductions waves constitute the complete electron-transfer series. The electrons are believed to be added successively to the three azo functions. In the mixed-ligand chelates [Ru(HL2)(pap)2]2+ and [Ru(HL2)(bpy)2]2+ the reductions due to HL2, pap, and bpy are observed.

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Reference：
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, Product Details of 15746-57-3

The photophysical properties of a series of ruthenium(II) complexes possessing the dppp2 (dppp2 = pyrido[2′,3′:5,6]pyrazino[2,3-f][1,10] phenanthroline) ligand, [Ru(bpy)n(dppp2)3-n]2+ (bpy = 2,2′-bipyridine; n = 0-3), were investigated. The dppp2-containing complexes possess a remarkable solvent dependence of the luminescence maximum, lifetime, and quantum yield. For example, the emission maximum of [Ru(bpy) 2(dppp2)]2+ blue shifts from 752 nm in CH3CN to 653 nm in CH2Cl2, concomitant with a 19-fold enhancement in the luminescence quantum yield. Electronic structure calculations, transient absorption spectroscopy, and electrochemistry were also used to gain insight into the photophysical properties of the dppp2 complexes. The pronounced solvent effect of the emission of these complexes is attributed to the changes in the relative stabilities of two low-lying metal-to-ligand charge transfer (MLCT) excited states on the environment, where the lowest energy MLCT state is more sensitive to the polarity of the solvent than that which lies at slightly higher energy. Transient absorption spectroscopy shows that the identity of the lowest energy MLCT state does not change as a function of solvent, however, its emission maximum and lifetime are greatly affected by the polarity of the surrounding medium. In contrast to [Ru(bpy)2(dppz)]2+ (dppz = dipyrido[3,2-a:2′,3′-c]phenzine), the lowest energy excited state in the dppp2-containing complexes is assigned as arising from a triplet MLCT state where the charge is localized on the portion of the dppp2 ligand distal to the metal, 3MLCTdis.

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