Showing papers on "Cobalt published in 1969"
263 citations
TL;DR: The two metal-binding sites of transferrin will form specific complexes with chromium, manganese, and cobalt ions, and a distinct difference between the two sites is evident by electron paramagnetic resonance spectroscopy when chromium is bound.
257 citations
TL;DR: The catalytic properties of the catalytic catalyst cobalt molybdate on alumina were investigated with the help of a microreactor pulse technique under chromatographic conditions.
219 citations
TL;DR: In this paper, the saturation magnetizations in the binary FeCo system were redetermined since an earlier investigation (P. Weiss and R. Forrer, Ann. Phys. 12, 1929) was made prior to the discovery of a CsCl-type ordered structure that has a wide solubility range.
Abstract: Saturation magnetizations in the binary Fe–Co system were redetermined since an earlier investigation (P. Weiss and R. Forrer, Ann. Phys. 12, 1929) was made prior to the discovery of a CsCl‐type ordered structure that has a wide solubility range. The alloys were quenched from 850°C at various rates in an attempt to suppress the ordering reaction. The magnetizations decreased as the quenching rate increased for alloys containing between 30 and 70 at.% cobalt. A maximum difference at 3% in the mean moment p was obtained for an equiatomic alloy quenched at the extreme rates. The mean moments for the ordered alloys are in good agreement with the previous investigation. The data for the fast quenched (presumably disordered) alloys indicate that the Slater‐Pauling curve, in the electron‐concentration range between iron and cobalt, has a maximum at about 28 at.% cobalt, compared with the 35 at.% suggested by the data of Weiss and Forrer.
185 citations
133 citations
TL;DR: In this article, the magnetic susceptibility of the 1:2 adduct of oxygen with Co salen obtained by the solid-state reaction has been measured from room temperature to 90°K: it was concluded that, when allowance is made for small impurities of unconverted Cosalen, this product is substantially diamagnetic.
Abstract: Some 1:2 adducts of oxygen with NN′-ethylenebis(salicylideneiminato)cobalt(II), Co salen, and its ring-substituted analogues are reported. These compounds, which were obtained from solutions of the cobalt(II)–Schiff's base complexes, were found to be substantially diamagnetic from room temperature to 90°K. The magnetic susceptibility of the 1:2 adduct of oxygen with Co salen obtained by the solid-state reaction has been measured from room temperature to 90°K: it is concluded that, when allowance is made for small impurities of unconverted Co salen, this product is substantially diamagnetic. Finally, conditions have been found in which Co 3-methoxysalen gives a 1:1 adduct with oxygen in pyridine as solvent. I.r. and magnetic susceptibility data suggest that the oxygen group in this adduct of formula Co 3-methoxysalen,py,O2 is symmetrically bonded to cobalt in an ethylene-like type of arrangement.
116 citations
TL;DR: In this article, the preparation and properties of halogenotris(tertiaryphosphine)cobalt complexes, CoXL 3 (X = Cl, Br, I; L = PPh 3, PBuPh 2, PBzPh 2 ), are described.
113 citations
TL;DR: In this paper, the structure determination of the cobalt molybdate on alumina catalyst has been studied and it is shown that the cobalo-molybdenum is distributed throughout the bulk of the alumina as CoAl 2 O 4, whereas the molybenzenum is spread over the carrier surface, probably as a monomolecular layer.
112 citations
Patent•
23 Jun 1969TL;DR: In this paper, strong, hard, impact-resistant bodies comprising tungsten carbide bonded with from 3 to 25% by weight of heterogeneous cobalt-tungsten solid-solution alloy, useful as cutting tools, are prepared by heating an intimately mixed cobalt/tungsten carbide powder to a temperature above 1000* C and consolidating the powder to density of at least 98% of its theoretical density.
Abstract: Strong, hard, impact-resistant bodies comprising tungsten carbide bonded with from 3 to 25% by weight of heterogeneous cobalt-tungsten solid-solution alloy, useful as cutting tools, are prepared by heating an intimately mixed cobalt/tungsten carbide powder to a temperature above 1000* C and consolidating the powder to a density of at least 98% of its theoretical density, having either. 1. MIXED A CARBON-RICH AND A CARBON-DEFICIENT POWDER TOGETHER PRIOR TO CONSOLIDATION TO PRODUCE A NON-HOMOGENEOUS BINDER; 2. ADDED FREE CARBON TO A CARBON-DEFICIENT POWDER TO PRODUCE LOCAL AREAS WHERE TUNGSTEN IS REMOVED FROM THE BINDER ALLOY AS TUNGSTEN CARBIDE; OR 3. ALLOWED A PORTION OF THE CARBON IN THE TUNGSTEN CARBIDE TO OXIDIZE DURING CONSOLIDATION TO PRODUCE AREAS IN THE BINDER PHASE WHICH ARE THEN CARBON DEFICIENT AND HIGH IN TUNGSTEN.
105 citations
100 citations
TL;DR: The preparation and properties of a new series of Vit B 12 model compounds, - cobalt chelates of bis(diacetylmonoximeimino)-propane 1,3 are reported in this paper.
TL;DR: In this paper, two modifications of CoMoO4 were prepared and two transition temperatures of the modifications into each other were shown to be octahedrally surrounded by oxygen.
TL;DR: In this article, the EDTA titration was used for the determination of the metal in organic compounds containing calcium, magnesium, zinc, barium, manganese, or cobalt.
TL;DR: In this paper, the thermal properties of the cobalt, nickel, copper, zinc, and cadmium-II complexes of diethyldithiocarbamic acid were determined by TG, DTA, and high temperature reflectance spectroscopy.
Abstract: The cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II), silver(I) and mercury(II) complexes of diethyldithiocarbamic acid were prepared and their thermal properties determined by TG, DTA, and high temperature reflectance spectroscopy. It was found that the copper(II), nickel(II), and zinc(II) chelates were completely volatile and thus represent a new class of volatile metal chelates. Vapor pressure measurements were made on four of the metal complexes; heats of vaporization ranged from 9.3±0.2 kcal/mole for Na[Co(DDC)3] to 24.2±0.6 kcal/mole for Zn(DDC)2.
Patent•
10 Sep 1969
TL;DR: Nickel and/or cobalt-based alloys are given a protective coating by diffusing into the surface of the alloy metallic aluminum and one or more metals of the platinum groups.
Abstract: Nickel and/or cobalt-based alloys are given a protective coating by diffusing into the surface of the alloy metallic aluminum and one or more metals of the platinum groups.
01 Jan 1969
TL;DR: In this paper, a new analysis was made on 100 iron meteorites for the elements nickel, cobalt, phosphorus, carbon, sulfur, and copper, using a new milling technique which provided chipped samples.
Abstract: New analyses have been made on 100 iron meteorites for the elements nickel, cobalt, phosphorus, carbon, sulfur, and copper. The meteorites were sampled using a new milling technique which provided chipped samples. Replicate analyses of high analytical precision were made on splits from these samples. On the basis of these new analyses graphical methods were used for the evaluation of earlier analyses of iron meteorites. The abundances of phosphorus, carbon and sulfur show variations depending upon the concentrations of non-metallic mineral phases taken in the sampling procedure. Cobalt and nickel show a positive correlation with each other. On the basis of this relationship approximately 35% of analyses done before 1907, as reported by Farrington, may be classified as ‘superior’ and suitable for use in calculations today. More recent analyses show a higher degree of superiority. Within selected gallium-germanium groups direct relationships between cobalt, nickel and phosphorus may also be predicted.
TL;DR: The results suggest that the intestinal mucosal uptake of cobalt is slightly greater than that of iron, and cobalt, unlike iron, is not sequestered in the mucosa and subsequently lost with desquamation of the intestinal epithelium.
TL;DR: The effect of applied cobalt on the cobalt content of pasture plants has been studied in pot, field, and laboratory experiments as mentioned in this paper, and the generally poor agreement between pot and field experiments may be partly due to the noted variation of cobalt status of pasture with season and the influence of waterlogging.
Abstract: The effect of applied cobalt on the cobalt content of pasture plants has been studied in pot, field, and laboratory experiments. The generally poor agreement between pot and field experiments may be partly due to the noted variation of cobalt status of pasture with season and the influence of waterlogging. Cobalt treatments were effective for at least 2 yr on the humus podzol soils, but there was only a residual effect for 1 yr on other soils. Alteration of the soil pH did not prove a satisfactory means of increasing cobalt status of pasture on soils where it was most required. The efficiency of cobalt fertilizers as a means of alleviating problems of cobalt deficiency depends on the manganese content of the soil. Plants grown on soils containing > 1000 p.p.m. of total manganese are unlikely to benefit from application of cobalt fertilizer to the soil, necessitating foliar application by sprays or the use of cobalt oxide pellets for stock.
TL;DR: In this article, the magnetic properties of pure FeCr2S4 and CoCr 2S4 have been investigated and the g-factors of cobalt, iron, and chromium in these compounds were evaluated.
Abstract: New measurements of magnetic properties of pure FeCr2S4 and CoCr2S4 have been carried out. The g-factors of cobalt, iron, and chromium in these compounds were evaluated. Exchange interactions were deduced from computation of the experimental paramagnetic and magnetization curves.
TL;DR: In this article, an analysis of the temperature dependence of correlation factor leads to a better determination for the vacancy-transition impurity interaction in a transition metal, and the results obtained for frequency factors D0 and activation energies Q are found in table 8.
TL;DR: It is proposed that cobalt and zine function at the active site for pyruvate because radioactivity of 60Co-labeled transcarboxylase is primarily associated with a subunit of the enzyme with a sedimentation constant of 6S that contains little or no biotin.
TL;DR: In this article, the 1:1(Cu), 1:2(Cu, Ni, Co), and 1:3(Ni, Co) complexes with dimepia ligand were obtained.
TL;DR: In this article, the synthesis and properties of some cobalt(II) and nickel (II) complexes of dithioacetylacetone and diselenoacetylacetonates are described.
Abstract: The synthesis and properties of some cobalt(II) and nickel(II) complexes of dithioacetylacetone and diselenoacetylacetone are described. Unlike the corresponding acetylacetonates, the cobalt and nickel complexes are square-coordinated monomers with ground states of spin S = 1/2 and S = 0, respectively. For divalent nickel, the isolation of a mixed complex containing one monothioacetylacetonate and one dithioacetylacetonate bidentate ligand completes the NiS2O2, NiS3O, NiS4 series of diamagnetic monomers. A tentative mechanism is proposed for the course of the reaction which leads to these compounds under the experimental conditions first formulated by Martin and Stewart. The infrared absorption spectra have been assigned on the basis of a normal coordinate analysis taken in conjunction with the unusually favourable circumstances offered by a closely related series of square-coordinated monomers [Cu(acac)2], [Co(SacSac)2], [Ni(SeacSeac)2].
TL;DR: In this paper, the results of electronic and low frequency vibrational spectral and magnetic susceptibility measurements are presented and used to assign coordination geometries of N-methylimidazole with divalent cobalt through zinc.