Annual survey covering the year 1985

Reactions of the μ-alkyne-dicobalt complexes [Co2(CO)6(μ-CF3–CC–R)] (R=CF3, H) with [Co2Cp2(μ-SMe)2]: substitution and insertion leading to novel thiolato-alkyne tetra- and tricobalt clusters

Irradiation of cobalt metallocenes at the ligand-to-metal charge transfer energies results in the labilization of the cyclopentadienyl-cobalt bond and radical release. The cyclopentadienyl radical is detected by electron paramagnetic resonance (EPR) spectroscopy using a spin trap and can also be chemically trapped using hydrogen-atom-donating reagents. This reaction presents a new photochemical method of generating new cobalt complexes or of forming cyclopentadienyl cobalt(I) species that are active for catalytic [2 + 2 + 2] cyclotrimerization reactions. More importantly, these results also show that cobaltocene should not be considered as a photostable redox reagent under many conditions, including those relevant to photovoltaics or photocatalysis.

Photoinduced Ligand-to-Metal Charge Transfer of Cobaltocene: Radical Release and Catalytic Cyclotrimerization.

Reaction of dinuclear thiolato-bridged cobalt compounds with activated alkynes. Formation and X-ray structure of an unusual trinuclear cobalt complex, [Co3(η5-C5H5)3(SMe)2(CF3CCCF3)2]

F. Le Floch-Perennou

Papers

Reaction of dinuclear thiolato-bridged cobalt compounds with activated alkynes. Formation and X-ray structure of an unusual trinuclear cobalt complex, [Co3(η5-C5H5)3(SMe)2(CF3CCCF3)2]