The synthesis of the first terminal imido complex of cobalt, [PhBP3]CoN-p-tolyl, is reported. Its synthesis proceeds by oxidative group transfer from cobalt(I) upon addition of tolyl azide at room temperature. This species and a related eta1-diazoalkane adduct have been structurally characterized. The diamagnetic imido complex [PhBP3]CoN-p-tolyl reacts with CO to liberate isocyanate and the cob...

The important role of the vitamin B12 coenzyme (FIGURE 1) in biochemiStryl and the discovery of a relatively easy method of conversion of the cobalamins to the coenzymes as well as a wide variety of cobalt-alkyl and cobalt-acyl analogues2 • .s,4.1i has stimulated a thorough examination of the structure, properties, and reactions of these unique compounds, which are the first examples of stable ...

Background: Cobalt (Co) is an essential trace element for mammals required for the synthesis of vitamin B12. It is not a cumulative toxin but chronic exposure induces negative effects on the organism. It was proven that cobalt passes via placenta appearing in the fetal blood and amniotic fluid and it is shown to possess an embryotoxic effect. Also, chromium (Cr) is recognized as a trace element...

Cobalt (Co2+) is required as an essential trace element to a variety of metabolic functions such as the synthesis of vitamin B12 in mammals. It was proven that cobalt passes through the placenta to the fetus. Cobalt possesses toxic effect on embryo. Also, Chromium (Cr3+) as an essential element for both animal and human nutrition has antioxidative capacity. In this study we examined the effects...

Two-dimensional (2D) and three-dimensional (3D) magnetic cobalt nanowire thin films with tunable 3-10 nm wire diameters have been electrodeposited using mesoporous silica templates containing 2D hexagonal or 3D cubic pore channels. As compared to bulk cobalt films, the cobalt nanowire thin films exhibit enhanced coercivities and controllable magnetic anisotropy through tuning of the mesostructu...

The nuclides zinc-65 and cobalt-60 associated with river-borne particulate matter are incorporated in sediment on the Continental Shelf near the Colum- ia River. Changes in the relative concentrations of zinc-65 and cobalt-60 and in the ratio of the activity of zinc-65 and cobalt-60 suggest that radioactive sediment moves northward 12 to 30 kilometers per year along the shelf and 2.5 to 10 kilo...

We report the preparation of a new type of nanocomposite containing cobalt and silver nanoparticles organized in parallel layers with a well controlled separation. This arrangement allows the observation of an enhanced low-frequency Raman signal at the vibration frequency of cobalt nanoparticles excited through the surface plasmons of silver nanoparticles. Numerical simulations of the electric ...

This article explores Cuba’s status within the context of strategic minerals politics, focusing specifically on cobalt. Cuba has third largest cobalt reserves in world, which is a crucial element lithium-ion batteries (especially those used electric cars). The US, other hand, sorely lacking cobalt, Washington’s list Strategic Raw Minerals and ranked terms its “supply chain risk”. key issues/que...

in this research, the effect of different biopolymers such as polyethylene glycol (peg) and polyvinylalcohol (pva) on synthesis and characterization of polymer/cobalt ferrite (cf) nano-composites bymechanical alloying method has been systematically investigated. the structural, morphological andmagnetic properties changes during mechanical milling were investigated by x-ray diffraction (xrd),fo...