Alkyl Derivatives of Europium(+2) and Ytterbium(+2). Crystal Structures of Eu[C(SiMe<sub>3</sub>)<sub>3</sub>]<sub>2</sub>, Yb[C(SiMe<sub>3</sub>)<sub>2</sub>(SiMe<sub>2</sub>CHCH<sub>2</sub>)]I·OEt<sub>2</sub> and Yb[C(SiMe<sub>3</sub>)<sub>2</sub>(SiMe<sub>2</sub>OMe)]I·OEt<sub>2</sub>
作者:Colin Eaborn、Peter B. Hitchcock、Keith Izod、Zheng-Rong Lu、J. David Smith
DOI:10.1021/om960493+
日期:1996.10.29
The alkyls EuR2 (R = C(SiMe3)3) and YbR2 (R = [C(SiMe3)2(SiMe2X)], X = Me, CHCH2, or CH2CH2OEt) have been obtained from reactions between KR and MI2, and the ytterbium analogues of Grignardreagents, Yb[C(SiMe3)2(SiMe2X)]I·OEt2 (X = Me, CH=CH2, Ph or OMe) from reactions between RI and Yb metal. The compounds YbR2 and EuR2 crystallize as solvent-free monomers with C−M−C = 136−137°. The alkylytterbium