- The effect of stabilizers on reduction of silver(I) ions in ethyl acetate
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The effects of polyethylene glycol and polymethyl methacrylate on reduction of silver(I) ions in the CF3COOAg-Qr-EA system (where Qr is quercetin and EA is ethyl acetate) were studied spectrophoto-metrically. The introduct
- Smagin,Larina
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- Reaction between silver trifluoroacetate and quercetin in low-polarity organic media
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CF3COOAg-Qr-P systems, where Qr is quercetin and P is an organic solvent, have been studied by spectroscopic methods. The reaction between silver trifluoroacetate and quercetin has been shown to produce colloid solutions, whose destruction terminates with the precipitation of a silver phase. The kinetic characteristics of the reaction between silver trifluoroacetate and quercetin in ethyl acetate have been determined.
- Smagin,Fadin
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- Ion-association and solvation of some copper (I), silver (I) and tetraalkylammonium salts in binary mixtures of acetonitrile with n-butyronitrile and N,N-dimethylacetamide
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Molar conductances of Bu4NBPh4, Bu 4NClO4, Bu4NI, Bu4NBr, Bu 4NCF3COO, Pr4NBr, Et4NI, Et 4NBPh4, NaClO4, NaBPh4, [Cu(CH 3CN)4]ClO4 and CF3COOAg have been measured in the concentration range (1-120) × 10-4 mol dm -3 in acetonitrile (AN) and binary mixtures of AN with n-butyronitrile (n-BTN) and DMA. The conductance data in all cases have been analyzed by the Shedlovsky method to evaluate Ao and KA of these electrolytes. Some of these salts are associated in these solvent systems. Ion-association in case of silver (I) salts is the largest and relatively more in case of AN + DMA mixtures. Limiting ion conductances (λ1o) and hence actual solvated radii (r i) in all solvent systems have been evaluated using a modified form of Stoke's law. Cu+, Ag+ and Na+ are highly solvated, CF3COO-, ClO4-, Br - and I- are poorly/moderately solvated and tetraalkylammonium ions (R4N+) and Ph4B - are not solvated in AN + n-BTN and AN + DMA mixtures. by Oldenbourg Wissenschaftsverlag.
- Gill, Dip Singh,Kumari, Avnesh,Gupta, Rahul,Jauhar,Puri
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- Oxygen Evolution by Means of Water Oxidation Catalyzed by Mononuclear Ruthenium-Ammine Complexes
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Water oxidation was achieved catalytically by the use of mononuclear ruthenium-ammine complexes and using Ce(IV) as an oxidant.Cyclic voltammetric studies of the mononuclear ruthenium-ammine complexes 2+ and 3+/
- Kaneko, Masao,Ramaraj, Ramasamy,Kira, Akira
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- Intramolecular Electron-Transfer Reactions in Bridged Polynuclear RuII-CoII Complexes Containing a (μ-Carboxylato)bis(μ-hydroxo)bis (and a RuII(NH3)5 Structural Unit
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Intramolecular electron transfer in RuII-L-CoIIIn trinuclear and pentanuclear complexes containing nicotinate, isonicotinate, pyrimidine-4-carboxylate, pyridine-2,6-dicarboxylate, and pyrazine-2,6-dicarboxylate anions as bridging ligands and N-coordinated RuII(NH3)5 units as internal reductants and (μ-carboxylato)bis(μ-hydroxo)bis moieties as oxidants has been studied.The nonbridging amines coordinated to cobalt(III) are three NH3, diethylenetriamine, or 1,4,7-triazacyclononane, respectively.A linear correlation (slope 0.46) of ΔG* vs. ΔG0 has been established for the intramolecular electron-transfer reactions with (NH3)6Co2(μ-OH)2 units as oxidants and RuII(NH3)5L as internal reductants.Variation of nonbridging amine ligands at the Co(III) centers affects the rate of intramolecular rate constants markedly.Reactivity differences are accounted for by differing driving force due to varying redox potentials of Co(III)/Co(II) couples.The rates of electron transfer were found to be rather intensitive to changes of the bridging ligand, which is taken as an indication that the reactions approach the adiabatic regime, although strongly negative entropies of activation (-10 to -18 cal K-1 mol-1) are observed for the series of complexes.
- Neves, Ademir,Herrmann, Willy,Wieghardt, Karl
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- Impact of counterions on micelle formation and polymerization of 11-acryloyloxyundecyltrimethylammonium surfactants
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New surfactants based on the cationic monomer 11-acryloyloxyundecyltrimethylammonium with counterions bromide, nitrate, acetate, camphorsulfonate, 4-toluenesulfonate, trifluoroacetate were obtained in this work. In most cases counterions change the critical micelle concentration by 2–3 times (being compared with bromide) except sample with acetate counterions (in this case critical micelle concentration increases by an order of magnitude). Substitution of bromide for hydrophobic counterions (toluenesulfonate, trifluoroacetate, camphorsulfonate) does not lead to expected transformation of spherical micelles to long wormlike micelles. The polymerization of such monomers occurs according to the microemulsion mechanism involving micelles of monomers.
- Bilibin, A. Yu,Fetin, P. A.,Fetina, V. I.,Lezov, A. A.,Zorin, I. M.
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- Self-assembled coordination thioether silver(I) macrocyclic complexes for homogeneous catalysis
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The bis-ortho-thioether 9,10-bis[(o-methylthio)phenyl]anthracene was synthesized as a syn-atropisomer, as revealed by X-ray diffraction. This alkylaryl thioether ligand (L) formed different macrocyclic complexes by coordination with silver(I) salts depending on the nature of the anion: M2L2 for AgOTf and AgOTFA, M6L4 for AgNO3. A discrete M2L complex was obtained in the presence of bulky PPh3AgOTf. These silver(I) complexes adopted similar structures in solution and in the solid state. As each sulfur atom in the ligand is prochiral, macrocycles L2M2 were obtained as mixtures of diastereoisomers, depending on the configurations of the sulfur atoms coordinated to silver cations. The X-ray structures of the two L2·(AgOTf)2 stereoisomers highlighted their different geometry. The catalytic activity of all silver(I) complexes was effective under homogeneous conditions in two tandem addition/cycloisomerization of alkynes using 0.5-1 mol % of catalytic loading.
- Cao, Zhen,Lacoudre, Aline,Rossy, Cybille,Bibal, Brigitte
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supporting information
p. 2465 - 2472
(2019/11/11)
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- MANUFACTURING METHOD OF FLUORINATED HYDROCARBON
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PROBLEM TO BE SOLVED: To provide a method for industrially advantageously manufacturing fluorinated hydrocarbon (3). SOLUTION: There is provided a method for manufacturing fluorinated hydrocarbon represented by the formula (3), including contacting a secondary or tertiary ether compound represented by the formula (1) and acid fluoride represented by the formula (2) in the presence of a silver salt in a hydrocarbon solvent. R1 and R2 are each independently a C1 to 3 alkyl group, R1 and R2 may bind to form a ring structure, R3 is H, a methyl group or an ethyl group, R4 and R5 are each independently a methyl group or an ethyl group. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
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Paragraph 0060
(2018/05/08)
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- Self-assembly and characterization of three-dimensional silver(I) coordination polymers containing N,N,N′,N′-tetrakis(pyridin-4-yl) methanediamine
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Silver(I) coordination polymers, [Ag(tpmd)](NO3)·2CH3OH (1), [Ag(tpmd)](CF3SO3) (2), and [Ag(tpmd)] (CF3CO2)·0.5CH3OH (3), have been obtained by the self-assembly of AgX (X = NO3-, CF3SO3-, CF3CO2-) and N,N,N′,N′-tetrakis(pyridin-4-yl)methanediamine (tpmd) in MeOH/MeCN. The coordination geometries of silver(I) ions in 1 and 2 are distorted tetrahedral structures, while that of 3 is a distorted trigonal bipyramid. 1 and 2 feature three-dimensional coordination polymers formed by coordination of the silver(I) ions to the tpmd ligands. 3 shows two-dimensional network basically. However, the network of 3 can be considered three-dimensional structure by the weak axial bonding of the fourth pyridine group from another tpmd ligand. 1-3 display strong emissions at 331, 342, and 326 nm, respectively.
- Shin, Jong Won,Min, Kil Sik
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- Features of obtaining silver nanoparticles in non-aqueos media by reduction of silver trifluoro acetate
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Possibility of silver nanoparticle synthesis by reduction of silver trifluoro acetate inorganic media (ethylene glycol, 2-methoxyethanol, ethyl acetate) was studied. Quercetin, ascorbicacid and potassium citrate were used asreducing agents.
- Glushko,Sadovskaya,Usova,Blokhina,Kozhukhov
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p. 2515 - 2520
(2016/02/27)
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- Silver(I) mono- and trifluoroacetates: Thermal stability and crystal structure
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Silver mono- and trifluoroacetates AgCH2FCOO (I) and AgCF3COO (II) were synthesized. The compounds were studied by differential thermal analysis, X-ray powder and single-crystal diffraction, and high-temperature mass spectrometry. Metallic silver and silver fluoride were found to be the products of thermal decomposition of I and II, respectively. The composition of saturated vapor was determined for II; I decomposes on heating, but not sublimates. The crystal structures of the compounds were determined.
- Karpova,Boltalin,Korenev,Troyanov
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- Complex formations of silver(I) trifluoroacetate and trifluoromethanesulfonate with benzene and cyclohexene
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An apparatus for measurements of equilibrium ligand vapor pressure has been applied in order to determine the stoichiometry of benzene and cyclohexene complexes of silver(I) trifluoroacetate (AgCF3CO2) and silver(I) trifluoromethanes
- Yanagihara, Naohisa,Gotoh, Tomio,Ogura, Tetsuya
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p. 4349 - 4354
(2008/10/09)
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- Mechanism of Oxidative Cleavage of Organocobalt(III) Macrocycles. Application of Electrochemical Techniques to Irreversible Electron-Transfer Processes
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The thermally stable dimethylcobalt(III) macrocycles, trans-Me2Co(DpnH) and trans-Me2Co(TIM)ClO4, are strongly labilized upon chemical and electrochemical oxidation, leading to the selective scission of only one methyl ligand.The formation of highly labile dimethylcobalt(IV) cations as reactive intermediates is evident from the irreversibility of the cyclic voltammetric (CV) wave even at -78 deg C.The heterogeneous rates of electron transfer are obtained from the CV data and compared with the corresponding homogeneous rates measured with various polypyridineiron(III) and hexachloroiridate(IV) oxidants.The resulting linear correlation underscores a common outer-sphere mechanism for the primary steps in the electrochemical and chemical oxidations.The cleaved methyl ligand affords ethane in high yields,but it can be trapped by hydrogen atom donors (chloroform) as methane and by halogen atom donors (carbon tetrachloride and benzyl bromide) as methyl halides.The kinetic study of ethane formation by a competition method support the mechanism in Scheme III, in which the spontaneous homolytic fragmentation of the dimethylcobalt(IV) intermediate leads to a free methyl radical.The subsequent diffusive encounter of methyl radicals is in accord with the deuterium-labeling study wich establishes a pattern of random dimerization of methyl ligands.The alternative formulation involving the direct bimolecular reaction of a pair of dimethylcobalt(IV) cations is ruled out by the insensitivity of ethane formation to the ionic stren gth of the medium.Methyl radical as the active precursor also follows from the selectivity pattern (observed in the competitive trapping with halogen atom donors), which is identical with that of the methyl radical generated independently from the photolysis of acetyl peroxide.A complete kinetic analysis of this mechanistic scheme provides information about the lifetime of the metastable dimethylcobalt(IV) species at the electrode surface which is sufficient to generate a high flux of methyl radicals to ensure efficient dimerization.
- Tamblyn, W. H.,Klingler, R. J.,Hwang, W. S.,Kochi, J. K.
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p. 3161 - 3172
(2007/10/02)
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