Showing papers on "Oxidation state published in 1970"
TL;DR: Horseradish peroxidase (donor: H2O2 oxidoreductase, EC 1.11.7), Compound I, is shown to react with I− to yield a ferriperoxid enzyme-iodine complex, which suggests that the oxidation state of the heme moieties of the two species is the same.
55 citations
TL;DR: In this paper, the absorption spectra of tris(2,2′-bipyridine) metal complexes of the first transition metals from titanium to cobalt have been studied.
Abstract: Electronic absorption spectra of zero-valent tris(2,2′-bipyridine) metal complexes of the first transition metals from titanium to cobalt have been studied. These spectra give a criterion to determine whether the central metal atom or the ligand is trapping the electrons furnished by reducing reagents upon syntheses of the complexes, if the absorption spectra of the coordinating negative ions are fairly free from the influence of the configuration interactions by the “ligand-metal” charge transfer excited states and/or by the “metal-ligand” ones. The vanadium complex is concluded as a complex of the metal atom in zero oxidation state and neutral bipyridine molecules, where the ‘metal-ligand’ charge transfer bands are observed. The iron- and the manganese-complexes are ionic complexes of the metal ion in a non-zero oxidation state and the negative ions of bipyridine, where the (π-π*) absorption bands of coordinating bipyridine negative ion are observed. On the basis of their spectral character, the complex...
34 citations
TL;DR: The high-pressure chemistry of iron in the solid state is rich in new phenomena as discussed by the authors, and the effect of pressure on the interelectronic repulsion parameters and the ligand-to-metal charge transfer peaks is investigated.
32 citations
TL;DR: In this article, the 59Co NMR was studied in a number of single crystals and solutions of cobalt carbonyl complexes X3MCo(CO)4 (M=Si, Ge, Sn, Pb; X=Cl, Br, I, C6H5)3SnCo( CO)4 containing metal-metal bonds.
Abstract: The 59Co NMR was studied in a number of single crystals and solutions of cobalt carbonyl complexes X3MCo(CO)4 (M=Si, Ge, Sn, Pb; X=Cl, Br, I, C6H5) containing metal–metal bonds. The z component of the chemical shift as determined by single crystal measurements in I3GeCo(CO)4, Br3SnCo(CO)4, and (C6H5)3SnCo(CO)4 was found to be constant within the series and showed a paramagnetic contribution of at least 3.6‰. As ligand field theory predicts no paramagnetic shift in this case, the data showed that for low oxidation state complexes the chemical shift can only be explained using MO theory. Good agreement with experiment was obtained using MO coefficients for the isoelectronic Fe(CO)5. The paramagnetic contributions to the x and y components of the shift vary considerably within the series (3.3‰–5.0‰). These variations were attributed to differences in the metal–metal bonds. It was found that for a given X the shifts do not vary linearly as the atomic weight of M is changed. This was attributed to differences in the importance of π‐bonding effects for the metal–metal bonds. The data suggest that in this series π‐bonding effects are strongest for the Co–Sn bond.
32 citations
TL;DR: In this article, 19 new uranium complexes, eighteen of which contain the element in the very unusual oxidation state of five, and one of which contains quadrivalent uranium complexed for the first time by an arsenic donor ligand, are reported.
27 citations
TL;DR: Isomer shifts of the recoilless 90 keV γ-rays of 99Ru were observed in a number of octahedrally coordinated complexes of ruthenium and reveal the influence of different ligands on the electron density at the Rn nuclei.
Abstract: Isomer shifts of the recoilless 90 keV γ-rays of99Ru were observed in a number of octahedrally coordinated complexes of ruthenium and reveal the influence of different ligands on the electron density at the ruthenium nuclei. For a given oxidation state the observed shifts are correlated with the spectrochemical series; the backbonding properties of ligands like CN−1 and NO+ cause a considerable increase of the electron density. This behaviour is largely similar to that found for compounds of iron and some 5d elements.
20 citations
17 citations
TL;DR: In this article, the formation of the compound CuMn2O4 in the Mn2O3-CuO system is accompanied by a change in the oxidation state of the manganese and changes of activity in the reduction of cinnamyl alcohol in neutral solution and in the degradation of carbon monoxide in air.
Abstract: The formation of the compound CuMn2O4 in the Mn2O3–CuO system is accompanied by a change in the oxidation state of the manganese and changes of activity in the oxidation of cinnamyl alcohol in neutral solution and in the oxidation of carbon monoxide in air.The results are interpreted as supporting the view that CuMn2O4 contains the resonance system, Cu2++ Mn3+↔ Cu++ Mn4+.
15 citations
TL;DR: In this article, the infrared and laser Baman spectra of a series of metal hexaisothiocyanate ions have been recorded over the range 2200-70 cm −1.
13 citations
8 citations
TL;DR: The reaction of antimony with arsenic pentafluoride in liquid SO2 produces a compound formulated as (Sbnn+)(AsF6-n)n as discussed by the authors, where n is the number of atoms in the compound.
Abstract: The reaction of antimony with arsenic pentafluoride in liquid SO2 produces a compound formulated as (Sbnn+)(AsF6–)n.
Patent•
09 Dec 1970
TL;DR: Aluminosilicates are prepared by heating natural or synthetic zeolites, in which at least some of the ion exchange sites have been substituted by one or more cations of metals of Groups IA to IV A and I B to VIII B of the Mendeleef Periodic Table.
Abstract: 1,215,398. Aluminosilicates. CHEMIEKOMBINAT BITTERFELD VEB. 25 April, 1968, No. 19731/68. Heading CiA. Aluminosilicates are prepared by heating natural or synthetic zeolites, in which at least some of the ion exchange sites have been substituted by one or more cations of metals of Groups IA to IV A and I B to VIII B of the Mendeleef Periodic Table, to above the decomposition temperature of the zeolite lattice. When it is desired to change the oxidation state of a metal ion, an oxidizing or reducing atmosphere is used during heating. If stability of oxidation state is required an inert atmosphere or a vacuum is provided. Examples include aluminosilicates made from zeolite A with silver, nickel and zinc, zeolite X with silver, zeolite Y with iron and synthetic mordenite with calcium and magnesium.
TL;DR: In this article, the authors describe the reaction of Europium with organic acids in liquid ammonia to give ammoniated compounds in which the metal is in the divalent oxidation state.
Abstract: Europium reacts with organic acids in liquid ammonia to give ammoniated compounds in which the metal is in the divalent oxidation state. All the compounds are solids and are characterized by infrared spectra and magnetic susceptibilities. The europium dialaninate is completely soluble in liquid ammonia.
01 Jan 1970
TL;DR: In this article, the details of IR, NMR, mass spectra, Mossbauer spectroscopy, magnetic susceptibility, and oxidation state are discussed in terms of the characterizations of metal π-complexes.
Abstract: Selected physical properties such as spectroscopy and magnetic chemistry reveal useful data on the general skeletal arrangement, bond strength, energy, and valency of metal π-complexes. In this chapter some of the details of infrared spectroscopy (IR), nuclear magnetic resonance (NMR), mass spectra, Mossbauer spectroscopy, magnetic susceptibility, and oxidation state are discussed in terms of the characterizations of metal π-complexes.