Showing papers on "Oxidation state published in 1971"
TL;DR: In this article, the authors studied the oxidation of cyclohexene catalysed by low oxidation state phosphine-transition metal complexes at 65° and 1 atm of oxygen.
63 citations
33 citations
TL;DR: In this article, the authors determined the oxidation state of iron in the plagioclase from the coarse-grained basalts 10044 and 12021 using Mossbauer spectroscopy.
31 citations
TL;DR: The bis(trimethylsilyl) diimine (BSD) was first prepared by oxidation of lithium tris (trimethylamine) hydrazide, which is light blue, sensitive to thermolysis and hydrolysis, and ignites spontaneously in air as mentioned in this paper.
Abstract: The highly reactive compound bis(trimethylsilyl)diimine (BSD), which was first prepared by oxidation of lithium tris(trimethylsilyl)hydrazide, is light blue, sensitive to thermolysis and hydrolysis, and ignites spontaneously in air. On the basis of electron transfer, acid-base, or free-radical reactions, it acts in particular as a (preparatively useful) redox system and as an agent for the introduction of azo groups. Redox reactions lead by oxidation or reduction of the other reactant through two oxidation stages to hydrazine derivatives or molecular nitrogen, and in the case of electrochemical reduction, to BSD radical-anions. Azo-group transfers, on the other hand, yield new inorganic azo compounds with no change in the oxidation state of the diimine group.
26 citations
TL;DR: In this article, low-oxidation state zirconium compounds were obtained by controlled reduction of zirconsium(IV) halogen compounds, such as (C5H5)2ZrCl]n and [(C5 H5) 2Zr]2O], and the complex (C 5 H5 2ZR· Bipy).
24 citations
TL;DR: In this paper, the effect of adsorbed Cu on the oxidation rate of HCOOH has been examined at + 0.60 V, where no Cu2+ adsorption is normally found.
Abstract: The adsorption and desorption of Cu on a smooth Pt electrode from 1 M H2SO4 solutions which contain a range of Cu2+ concentrations has been studied as a function of potential. The effect of adsorbed Cu on the oxidation rate of HCOOH has been examined at + 0.60 V (RHE). Cu2+ adsorption is controlled largely by an activation process. The slow step in the process is apparently the discharge of Cu2+ at the electrode to Cu+. Desorption of a preadsorbed Cu layer (+0.40 V) is extremely rapid at potentials+ 0.70 V, where no Cu2+ adsorption is normally found. Analysis of the oxidation state of the adsorbing layer by charge and coverage measurements yields a value of 1.92 electrons/site. This indicates that the major part of the layer is Cuads attached to a single Pt surface site. The rate of adsorption of Cu2+ is decreased slightly in the presence of 0.1 M HCOOH. At low coverages (θCuads⩽0.19), a slight enhancement of the HCOOH oxidation rate is observed at +0.60 V. Above this coverage, the oxidation process is inhibited. Results are interpreted in terms of Cu2+ adsorption mechanisms on Pt and the effect of the adsorbed layer on the mechanisms of HCOOH electro-oxidation on Pt.
15 citations
Patent•
26 Mar 1971TL;DR: In this article, the authors proposed a method for the OXIDATIVE DEHYDROGENATION of dehydrogenatable orGANIC farms by heating the farms with OXYGEN (and OPTIONally HALOGEN) in the presence of a solid CRYSTALLINE CATALYST CONTAINING MANGANESE and at least two other METALS.
Abstract: PROCESS FOR THE OXIDATIVE DEHYDROGENATION OF DEHYDROGENATABLE ORGANIC COMPOUNDS BY HEATING THE COMPOUNDS WITH OXYGEN (AND OPTIONALLY HALOGEN) IN THE PRESENCE OF A SOLID CRYSTALLINE CATALYST CONTAINING MANGANESE AND AT LEAST TWO OTHER METALS, ONE OF WHICH IS A LIGHT METAL HAVING AN OXIDATION STATE OF 1+ OR 2+. MANGANESE COMPOUNDS OF THE PEROVSKITE STRUCTURE ARE PREFERRED CATALYSTS.
14 citations
TL;DR: In this article, the effect of adsorbed Ag on the oxidation rate of HCOOH has been examined at 0.65 and 0.75 V in solutions varying from 10-4 to 10-6 M.
Abstract: The adsorption of Ag on a smooth Pt electrode in 1 M H2SO4 at 40°C has been studied from 0.45 to 0.75 V (RHE) in solutions varying from 10–4 to 10–6 M. The effect of adsorbed Ag on the oxidation rate of HCOOH has been examined at 0.65 and 0.75 V. A diffusion-limited adsorption process is indicated. Analysis of the oxidation state of the adsorbed layer to θAgads= 0.59 yields a value of 0.77 electrons/site. Above this coverage, a value of 1.97 electrons/site is obtained. This suggests, in the former case, a mixed layer composed of Ag singly bonded to a single Pt site with some single bonding to two Pt sites. At the higher coverages, two Ag atoms are apparently attached to a single Pt surface site. The rate of adsorption of Ag+ is decreased by the presence of HCOOH. Below θAgads∼0.40, the oxidation rate of HCOOH is enhanced compared with that of an electrode partially covered with adsorbed HCOOH intermediates. Above this coverage, the oxidation is inhibited.
13 citations
11 citations
TL;DR: In this article, the new compound Hg32+(AsF6−)2 containing mercury in the oxidation state of +2/3 has been obtained by the reaction of mercury with arsenic pentafluoride in liquid SO2; this compound was shown, by X-ray methods, to be linear and symmetrical.
Abstract: The new compound Hg32+(AsF6–)2 containing mercury in the oxidation state of +2//3 has been obtained by the reaction of mercury with arsenic pentafluoride in liquid SO2; the Hg32+ ion which is shown, by X-ray methods, to be linear and symmetrical is also obtained when mercury is dissolved in fluorosulphuric acid.
8 citations
TL;DR: In the series of tris-(2,2′-bipyridyl) complexes of chromium, the Cr-N stretching frequencies change very little by changing the oxidation state from III to 0 as mentioned in this paper.
Abstract: In the series of tris-(2,2′-bipyridyl) complexes of chromium, the Cr–N stretching frequencies change very little by changing the oxidation state of chromium from III to 0, this unexpected result indicating that the strength of the Cr–N bond does not change appreciably over a wide change in the oxidation state of chromium.
TL;DR: In this article, the new compound Hg62+(AsF6−)2 containing mercury in the previously unknown oxidation state of +⅓ has been obtained by the reaction of mercury with arsenic pentafluoride in liquid SO2.
Abstract: The new compound Hg62+(AsF6–)2 containing mercury in the previously unknown oxidation state of +⅓ has been obtained by the reaction of mercury with arsenic pentafluoride in liquid SO2.
TL;DR: In this article, peroxydisulfuryl difluoride reacts with carbonates and oxides to give the oxyfluorosulfates, MnOSO3F, CoOSO 3F, NiO(SO 3F)2 and TlOSO-3F respectively.
Abstract: : Peroxydisulfuryl difluoride reacts with carbonates and oxides os manganese, cobalt, nickel, silver and thallium(I) to give the oxyfluorosulfates, MnOSO3F, CoOSO3F, NiOSO3F, Ag2O(SO3F)2 and TlOSO3F respectively. Their properties are discussed. (Author)
TL;DR: In this article, the dealkylation reactions with (Ph3P)4M (M = Pd, Pt) and yield mainly (Ph 3P)2M(N3)2.
TL;DR: In this paper, the Athylendiammonium-oxopentachloromolybdat(V), enH2 · [MoOCl5], in reiner Form (grun) dargestellt und durch Analyse, Oxydationsstufe, Magnetismus (μeff = 1,63 BM), IR-and Elektronenspektrum sowie durch Leitfahigkeitsmessungen charakterisiert.
Abstract: Ethylene diammonium oxopentachloro molybdate(V) enH2 [MoOCl5] (where en = ethylene diammine) has been isolated in pure state and has been characterised by chemical analysis, oxidation state determination, magnetic measurement, spectroscopic investigations and conductivity measurements. Its reactions have been studied in solution and solid state.
Es wurde Athylendiammonium-oxopentachloromolybdat(V), enH2 · [MoOCl5], in reiner Form (grun) dargestellt und durch Analyse, Oxydationsstufe, Magnetismus (μeff = 1,63 BM), IR- und Elektronenspektrum sowie durch Leitfahigkeitsmessungen charakterisiert. Einige seiner Reaktionen in Losung und festem Zustand wurden untersucht.
TL;DR: The interaction of uranium with a series of inorganic halides in aqueous and organic solvents has been studied in this article, and the results are discussed and possible uses of the reactions suggested.
TL;DR: In this paper, a numerical solution by complex Hermitian matrix diagonalization is made for the spin eigenvalues and interpolated e.s.r. transitions for an orthorhombically sited vanadium(II) ion in lithium fluoride crystal.
Abstract: A numerical solution by complex Hermitian matrix diagonalisation is made for the spin eigenvalues and interpolated e.s.r. transitions for an orthorhombically sited vanadium(II) ion in lithium fluoride crystal. It is concluded that vanadium(II) ions associate with a single cation vacancy in the nearest neighbour cationic shells of lithium and sodium fluoride crystals as do manganese(II) ions in lithium fluoride crystals. Manganese(II) ions in sodium fluoride associate with cation vacancies in the next-nearest-neighbour cationic shell, and, in the presence of hydroxide anion, combine with the hydroxide anion in their first co-ordination shell. X-Rays induce vanadium(II) and manganese(II) migration by a triple process of oxidation by trapping Vk-centres (F2–), migration and then reduction back to their original oxidation state by combining with F-centres (e–). The hydroxide anion in NaF : OH– : Mn2+ inhibits this process. Thermal annealing restores the doped crystals to their original condition.
01 Jan 1971
TL;DR: In this paper, a correlation between the isomer shift and the oxidation state of the ruthenium (or the number of 4d electrons) was made and compared with similar results for iron compounds.
Abstract: The great utility of the Mossbauer effect in the solution of chemical problems, especially those involving iron and tin compounds, lends impetus to the exploration of its usefulness in other chemical systems. The Mossbauer effect for the 90-keV transition of 99Ru, first reported by Kistner [9], appears to be a unique chemical probe. The experimental difficulties are much greater than those encountered in iron and tin work since the source and absorber must be cooled to liquid helium temperatures and very large absorber thicknesses must be used. However, the results reported here and those reported by Mossbauer and co-workers [12], indicate that the isomer shift and the quadrupole splitting in ruthenium compounds can be related to the structure and bonding in the molecules. A correlation between the isomer shift and the oxidation state of the ruthenium (or the number of 4d electrons) can be made and compared with similar results for iron compounds. Also, the isomer shifts can be correlated with the total charge density at the ruthenium nucleus as calculated by restricted Hartree-Fock wave functions of the s-electron density at the nucleus for specific oxidation states. The large variety of known ruthenium compounds in several different oxidation states makes this system ideal for the systematic evaluation of Mossbauer parameters in chemical terms.