Day: November 25, 2020

32993-05-8. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 32993-05-8, Name is Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II). In a document type is Article, introducing its new discovery.

1 ,1 -Bis(ethynyl)biferrocene as a linking group for gold, ruthenium, and osmium fragments: synthesis, solid state structures, and electrochemical, UV-Vis, and EPR spectroscopical studies

A series of organometallic mono- and disubstituted bis(alkynyl)biferrocenes of type (LnMC?C)-(HC?C)bfc (LnM = (eta5-C5H5)(Ph3P)2RU (8a), (eta5-C5H5)(Ph3P) 2Os (8b), (eta5 -C5H5)(dppf)Ru (8c); bfc = 1,1 -biferrocenyl, ((eta5 -C5H 4)2Fe)2; dppf = 1,1 -bis(diphenyl)phosphanyl ferrocene, (eta5 -C5H4PPh2) 2Fe) and (LnMC?C)2bfc (LnM = (Ph3P)Au (6), (eta5 -C5H5)(Ph 3P)2Ru (9a), (eta5 -C5H 5)(Ph3P)2Os (9b), (eta5 -C 5H5)(dppf)Ru (9c)) have been synthesized from (HC?C)2bfc (4) with either (Ph3P)AuCl (5) in the presence of HNEt2/[CuI] (synthesis of 6) or LnMX (L nMX = (eta5 -C5H5)(Ph 3P)2RuCl (7a); (eta5 -C5H 5)(Ph3P)2OsBr (7b); (eta5 -C 5H5)(dppf)RuCl (7c)) together with [H4N]PF 6 and KOtBu (synthesis of 8 and 9), respectively. The structures of 6, 8b, 9a, 9b, and 9c in the solid state were determined by single-crystal X-ray structure analysis, showing unsymmetrical (8) or symmetrical geometries (6, 9), with almost eclipsed conformations or approximately midway positions between the fully eclipsed and the fully staggered conformation of the bfc cyclopentadienyl rings and with anti geometry of the linear ethynyl connecting units. UV-vis and NIR spectroscopic measurements suggest a weak interaction between the appropriate metal atoms. The associated radical cations were in situ generated by stepwise chemical oxidation and characterized by continuous wave electron paramagnetic resonance (EPR) investigations in X-band performed at low temperature.

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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. 246047-72-3, C46H65Cl2N2PRu. A document type is Article, introducing its new discovery., 246047-72-3

Inhibitory effect of ethylene in ene-yne metathesis: The case for ruthenacyclobutane resting states

Reaction kinetics and mechanistic studies for ethylene-internal alkyne metathesis promoted by the phosphine-free initiator Ru1 (Piers’s catalyst) is described. The kinetic order of reactants and catalyst was determined. The effect of ethylene was studied at different solution concentrations using ethylene gas mixtures applied at constant pressure. Unlike earlier studies with the second-generation Grubbs complex, ethylene was found to show an inverse first-order rate dependence. Under catalytic conditions, a ruthenacyclobutane intermediate was observed by proton NMR spectroscopy at low temperature. Combined with the kinetic study, these data suggest a catalytic cycle involving a reactive LnRu=CH2 species in equilibrium with ethylene to form a ruthenacyclobutane, a catalyst resting state. Rates were determined for a variety of internal alkynes of varying substitution. Also, at low ethylene pressures, preparative syntheses of several 2,3-disubstituted 1,3-butadienes were achieved. Using the kinetic method, several phosphine-free inhibitors were examined for their ability to promote ethylene-alkyne metathesis and to guide selection of the optimal catalyst.

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

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)

Silane: A new linker for chromophores in dye-sensitised solar cells

A series of ruthenium(II) polypyridyl complexes, with novel silane functionalisation, [Ru(bipy)2(bipy-sil)](PF6)2 (3), [Ru(bipy-sil)2Cl2] (6), and [Ru(bipy-sil) 2(NCS)2] (7) have been synthesised and tested as chromophores (dyes) in TiO2 and WO3 based dye-sensitised solar cells (DSSCs). The performance of the respective DSSCs were compared to analogous dyes with ionic carboxylate ([Ru(bipy)2(dcbipy)](PF 6)2 (1), [Ru(dcbipy)2Cl2] (4), [Ru(dcbipy)2(NCS)2] (5)) or phosphonate ([Ru(bipy) 2(dpipy)](PF6)2 (2)) linking groups. The covalent silane-metal oxide linkage offers much needed improvement to the operating conditions, and lifetime of DSSCs, in terms of pH range and choice of solvent. UV-Vis spectroscopy of the deep-red solutions showed that the bis-bipy-sil complexes absorbed more visible light than the tris-bipy complex, as indicated by the presence of two absorption bands and higher epsilon values. The UV-Vis spectrum of (3) contained a single broad absorption at 400-600 nm with: lambdamax = 457 nm; epsilon = 10 520 ¡À 440 L mol -1 cm-1, whereas two intense broad absorption bands were observed for novel bis-bipy-sil complexes (6): 340-370 nm (lambda max(1) = 365 nm, epsilon(1) = 12 716 ¡À 180 L mol-1 cm-1); and 440-540 nm (lambdamax(2) = 485 nm, epsilon(2) = 11 070 ¡À 150 L mol-1 cm -1), and (7): 340-400 nm (lambdamax = 371 nm, epsilon(1) = 20 690 ¡À 485 L mol-1 cm-1), and 460-530 nm (lambdamax = 500 nm and epsilon(2) = 20 750 ¡À 487 L mol-1 cm-1). The bands in (7) being significantly more defined. A 10-fold improvement in the efficiency of the bipy-sil TiO2-based DSSCs was observed from (3) to (6) to (7). This performance was lower than that of the commercial N3 dye, [Ru(dcbipy) 2(NCS)2] (5), but the current of (7) on WO3, was comparable to that of the carboxylate system (4). There is considerable potential for further improvement by modification of the silyl linker, reducing the long non-conjugated propyl chain between the amide group and the silatrane (bipy-sil), to a short, conjugated link. During an extensive synthetic study, the most promising strategy was identified as direct linkage, the formation of a direct Si-C bond, using butyllithium with 4,4?-dibromo-2,2?- bipyridine and either trimethylsilane or 1-ethoxysilatrane, provided that the product can be captured and stabilised prior to binding to a metal oxide coated DSSC substrate.

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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. 114615-82-6, C12H28NO4Ru. A document type is Article, introducing its new discovery., 114615-82-6

Potent HIV-1 protease inhibitors incorporating squaramide-derived P2 ligands: Design, synthesis, and biological evaluation

We describe the design, synthesis, and biological evaluation of novel HIV-1 protease inhibitors containing a squaramide-derived scaffold as the P2 ligand in combination with a (R)-hydroxyethylamine sulfonamide isostere. Inhibitor 3h with an N-methyl-3-(R)-aminotetrahydrofuranyl squaramide P2-ligand displayed an HIV-1 protease inhibitory Ki value of 0.51 nM. An energy minimized model of 3h revealed the major molecular interactions between HIV-1 protease active site and the tetrahydrofuranyl squaramide scaffold that may be responsible for its potent activity.

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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., 15746-57-3

Custom-fit ruthenium(II) metallopeptides: A new twist to DNA binding with coordination compounds

A new bipyridine building block has been used for the solid-phase synthesis of dinuclear DNA-binding ruthenium(II) metallopeptides. Detailed spectroscopic studies suggest that these compounds bind to the DNA by insertion into the DNA minor groove. Moreover, the potential of the solid-phase peptide synthesis approach is demonstrated by the straightforward synthesis of an octaarginine derivative that shows effective cellular internalization and cytotoxicity linked with strong DNA interaction, as evidenced by steady-state fluorescence spectroscopy and AFM studies. Metallopeptides made-to-measure: A new bipyridine building block has been used for the solid-phase synthesis of dinuclear DNA-binding ruthenium(II) metallopeptides. The potential of the solid-phase peptide synthesis (SPPS) is demonstrated by the straightforward synthesis of an octaarginine derivative that shows effective cellular internalization and cytotoxicity linked with strong DNA interaction (see figure). Copyright

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

Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, the author is Corte-Real, Leonor and a compound is mentioned, 32993-05-8, Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II), introducing its new discovery. 32993-05-8

Anticancer activity of structurally related ruthenium(II) cyclopentadienyl complexes

A set of structurally related Ru(eta5-C5H 5) complexes with bidentate N,N?-heteroaromatic ligands have been evaluated as prospective metallodrugs, with focus on exploring the uptake and cell death mechanisms and potential cellular targets. We have extended these studies to examine the potential of these complexes to target cancer cell metabolism, the energetic-related phenotype of cancer cells. The observations that these complexes can enter cells, probably facilitated by binding to plasma transferrin, and can be retained preferentially at the membranes prompted us to explore possible membrane targets involved in cancer cell metabolism. Most malignant tumors present the Warburg effect, which consists in increasing glycolytic rates with production of lactate, even in the presence of oxygen. The reliance of glycolytic cancer cells on trans-plasma-membrane electron transport (TPMET) systems for their continued survival raises the question of their appropriateness as a target for anticancer drug development strategies. Considering the interesting findings that some anticancer drugs in clinical use are cytotoxic even without entering cells and can inhibit TPMET activity, we investigated whether redox enzyme modulation could be a potential mechanism of action of antitumor ruthenium complexes. The results from this study indicated that ruthenium complexes can inhibit lactate production and TPMET activity in a way dependent on the cancer cell aggressiveness and the concentration of the complex. Combination approaches that target cell metabolism (glycolytic inhibitors) as well as proliferation are needed to successfully cure cancer. This study supports the potential use of some of these ruthenium complexes as adjuvants of glycolytic inhibitors in the treatment of aggressive cancers.

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

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

Ruthenium phenolates, synthesis, characterization and electron-transfer properties of some salicylaldiminato and 2-(arylazo)phenolato complexes of ruthenium

Eleven mixed-ligand ruthenium(II) complexes of the general formula [Ru(bpy)2 (L)]ClO4 [bpy = 2,2?-bipyridine. L = salicylaldiminate or 2-(arylazo) phenolate anion] have been synthesized and characterized. The complexes are diamagnetic (low-spin d6, S = 0) and in solution show intense MLCT transitions in the visible region. In acetonitrile solution they all show a reversible ruthenium(II) ruthenium(III) oxidation in the range 0.5-0.9 V versus SCE and an irreversible ruthenium(III)-ruthenium(IV) oxidation near 1.6 V versus SCE. The potential of the ruthenium(II) ruthenium(III) couple is sensitive to the nature of substituents on the ligand L. Two successive one-electron reductions of the coordinated bpy are also observed near -1.5 and -1.8 V versus SCE. Two representative [RuIII(bpy)2(L)]2+ complexes have been synthesized by chemical oxidation of their ruthenium(II) precursors by aqueous ceric solution and isolated as perchlorate salts. These oxidized complexes are paramagnetic (low-spin d5, S = 1/2) and show rhombic ESR spectra at 77 K. They show intense LMCT transitions in the visible region in acetonitrile solution together with weak ligand-field transitions at lower energies. Chemical reduction of these ruthenium(III) complexes by hydrazine gives back the parent ruthenium(II) complexes. In acetonitrile solution the [RuIII(bpy)2(L)]2+ complexes oxidize N.N-dimethyl aniline, 1,2-napthoquinone-1-oxime, [RuII(bpy)2Cl2] and [FeII(C5H5)2] to produce N,N,N?,N?-tetramethylbenzidine, 1,2-napthoquinone-1-iminoxy radical, [RuIII(bpy)2Cl2]+ and [FeIII(C5H5)2]+, respectively, which have been characterized by spectroscopic and electrochemical techniques.

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

32993-05-8, An article , which mentions 32993-05-8, molecular formula is C41H35ClP2Ru. The compound – Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II) played an important role in people’s production and life.

Syntheses, structures, some reactions, and electrochemical oxidation of ferrocenylethynyl complexes of iron, ruthenium, and osmium

The syntheses and characterizations of several complexes containing ferrocenylethynyl and ferrocene-1,1?-bis(ethynyl) groups attached to M(PP)Cp? [M = Fe, Ru, PP = dppe, Cp? = Cp*; M = Ru, Os, PP = (PPh3)2, dppe, Cp? = Cp] are described. Reactions with tetracyanoethene have given either tetracyanobuta-1,3-dienyl or eta3-allylic derivatives, while addition of Me+ afforded the corresponding vinylidene derivatives. Some electrochemical measurements are discussed in terms of electronic communication between the redox-active M(PP)-Cp? groups through the ferrocene nucleus. The molecular structures of 14 of these complexes have been determined by crystallographic methods.

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

Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer37366-09-9, introducing its new discovery.

Proton-induced dynamic equilibrium between cyclometalated ruthenium rNHC (remote N-heterocyclic carbene) tautomers with an NAD+/NADH function

Cyclometalated ruthenium(II) complexes having acridine moieties have been synthesized and characterized by spectroscopic methods. Protonation of the acridine nitrogen of the ruthenium(II) complexes not only causes dynamic equilibrium with remote N-heterocyclic carbene Ru=C complexes but also generates the NAD+/NADH redox function driven by a proton-coupled two-electron transfer accompanying a reversible C-H bond formation in the pyridinium ring.

37366-09-9, Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. 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 the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, 15746-57-3, the author is Fitchett, Christopher M. and a compound is mentioned, 15746-57-3, Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), introducing its new discovery.

Synthesis, X-ray crystal structures, spectroscopy and electrochemistry of ruthenium(II) complexes of two chelating ligands containing [1,2,3]triazolo[1,5-a]pyridine subunits

Bis(2,2?-bipyridine)ruthenium(II) complexes of two chelating ligands containing [1,2,3]triazolo[1,5-a]pyridine subunits have been prepared. X-ray crystal structures show that this ring system remains intact upon coordination to ruthenium. Spectroscopic and electrochemical data reflect the electron-rich nature of these ligands.

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