Abstract
Sm(Tp Me 2 ) 2 undergoes one-electron-transfer reactions with a variety of reagents leading to mono- or dimetallic compounds, depending on the ligands. Reaction of Sm(Tp Me 2 ) 2 with fluorenone, benzophenone, benzaldehyde azine and phenantrenequinone gives monomeric Sm(Tp Me 2 ) 2X compounds. The radical anion nature of the coordinating ligands has been established by NMR and X-ray structural analysis. Reaction of Sm(Tp Me 2 ) 2 with less bulky ligands such as benzaldehyde or pyrazine leads to dimetallic [Sm(Tp Me 2 ) 2] 2[μ-Y] compounds, where Y is the dianion formed by C–C coupling of two reductively eliminated ligands. The synthesis and reactivity of mono-ligated ytterbium(II) compounds with the sterically demanding Tp Ms,R (Tp Ms,R=[HB(3-Ms,5-Rpz) 3]; Ms=mesityl, R=H, Me) and Tp Ms,R* (Tp Ms,R*=[HB(3-Ms,5-Rpz) 2(3-R,5-Mspz)]) ligands is also described.
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