Topic
Cobalt
About: Cobalt is a research topic. Over the lifetime, 69899 publications have been published within this topic receiving 1242058 citations. The topic is also known as: Co & Element 27.
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TL;DR: In this paper, the potential of using cobalt incorporated MCM41 (i.e. Co-MCM41) prepared from different cobalt sources to activate peroxymonosulfate (PMS) for the degradation of caffeine in aqueous solution was evaluated.
204 citations
TL;DR: In this article, the theoretical aspects to be considered when discussing spin-crossover compounds in general and cobalt(II) systems in particular are discussed and case studies on [Co(bpy)3] 2+ and [Co[terpy)2] 2 + are presented and discussing results from magnetic susceptibility measurements, X-ray crystallography, optical spectroscopy, and EPR spectroscopic analysis.
204 citations
TL;DR: The approach of researchers at Brookhaven National Laboratory to the homogeneous generation of hydrogen is to convert the luminescent excited state of tris(2,2'-bipyridine)-ruthenium(II) (*Ru(bpy)/sub 3/O/sup 2 +/) to the more strongly reducing (and longer lived) ion Ru (bpy/sub 3//sup +/) as mentioned in this paper.
Abstract: The approach of researchers at Brookhaven National Laboratory to the homogeneous generation of hydrogen is to convert the luminescent excited state of tris(2,2'-bipyridine)-ruthenium(II) (*Ru(bpy)/sub 3//sup 2 +/) to the more strongly reducing (and longer lived) ion Ru(bpy)/sub 3//sup +/. The Ru(bpy)/sub 3//sup +/ reduces a metal complex which reacts with H/sub 3/O/sup +/ or H/sub 2/O to form an unstable hydride. The hydride in turn decomposes to yield hydrogen. The blue cobalt(I) bipyridine complexes produced by Na(Hg) or electrochemical reduction of cobalt(II) bipyridine complexes are very powerful reducing agents and are not likely to form stable hydrides in solution. Cobalt(I) bipyridine complexes are thus excellent candidates for mediating the homogeneous formation of hydrogen. This expectation has been confirmed: visible-light irradiation of solutions containing Ru(bpy)/sub 3//sup 2 +/, ascorbate, Co/sup 2 +/, and bpy or phen derivatives produces hydrogen with a quantum yield of up to 0.13 mol einstein/sup -1/. Low yields of H/sub 2/ are also produced in the absence of Co/sup 2 +/.
204 citations
TL;DR: In this article, the growth behavior of Co-doped TiO2 films was investigated and it was shown that the formation of cobalt clusters will cause room-temperature ferromagnetism.
Abstract: Anatase Ti0.96Co0.04O2 films were grown epitaxially on SrTiO3 (001) substrates by using pulsed laser deposition with in-situ reflection high-energy electron diffraction. The oxygen partial pressure, PO2, during the growth was systematically varied. As PO2 decreased, the growth behavior was changed from a two-dimensional layer-by-layer-like growth to a three-dimensional island-like one, which resulted in an increase in the saturation magnetization. These structural and magnetic changes were explained in terms of the formation of cobalt clusters whose existence was proved by transmission-electron-microscope studies. Our work clearly indicates that the cobalt clustering will cause room-temperature ferromagnetism in the Co-doped TiO2 films.
204 citations