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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the synthesis and characterization of three new cobalt catalysts for the copolymerization of carbon dioxide and cyclohexene oxide are reported, which are extremely active at just 1 atm pressure of CO 2.
Abstract: The synthesis and characterization of three new cobalt catalysts for the copolymerization of carbon dioxide and cyclohexene oxide are reported. All the complexes are extremely active at just 1 atm pressure of carbon dioxide, with very high selectivity for copolymerization and carbonate formation. The catalysts are dicobalt(II/II and II/III) and tricobalt(II/II/II) complexes coordinated by a macrocyclic, reduced “Robson” type ancillary ligand and by acetate groups. The complexes are significantly more active than their direct zinc analogues, which we attribute to the increased nucleophilicity of the cobalt−oxygen bond in the cobalt−carbonate propagating species. All three complexes are characterized using mass spectrometry, infrared and ultraviolet−visible spectroscopies, elemental analysis, and, for the tricobalt complex and mixed valence dicobalt species, single-crystal X-ray crystallography.
175 citations
TL;DR: The biochemical and genetic experiments reported here demonstrate that iron-sulfur proteins are greatly affected in cobalt-treated Escherichia coli cells, and a model wherein cobalt competes out iron during synthesis of [Fe-S] clusters in metabolically essential proteins is proposed.
175 citations
175 citations
TL;DR: Cobalt(II) (R)-2-methylpiperazine (MPPA) trichloride is the first example of ferroelectric MOC that can really reach the spontaneous polarization status and opens up a new avenue to explore novel MOC-based ferroelectrics.
Abstract: Metal−organic coordination (MOC)-type ferroelectrics, cobalt(II) (R)-2-methylpiperazine (MPPA) trichloride [CoIICl3(H-MPPA)], was constructed through hydrogen bonds. It is a good ferroelectric candidate with a Ps = 6.8 μC·cm−2 as high as almost twice that of triglycine sulfate (Ps = 3.5 μC·cm−2) and significantly larger than that of KH2PO4 at the low-temperature ferroelectric phase Fdd2. [CoIICl3(H-MPPA)] is the first example of ferroelectric MOC that can really reach the spontaneous polarization status and opens up a new avenue to explore novel MOC-based ferroelectrics.
175 citations
TL;DR: In this paper, the surface area, density, crystalline parameters, sulfur content and catalytic activity of molybdenum sulfide-cobalt sulfide mixed powders were investigated.
174 citations