Tridentate CCC-Pincer Bis(carbene)-Ligated Rare-Earth Metal Dibromides. Synthesis and Characterization
作者：Dongmei Cui, Masayoshi Nishiura, Olivier Tardif and Zhaomin Hou
关键字：xylene-bridged; isostructrual; pincer; monoanionic; in situ
论文来源：期刊
具体来源：http://pubs.acs.org/doi/pdf/10.1021/om800801k
发表时间：2008年
The
first xylene-bridged bis(N-heterocyclic carbene) (bis(NHC))-ligated CCC-pincer
rare-earth metal dibromides (PBNHC)LnBr2(THF) (PBNHC = 2,6-(2,4,6-Me3C6H2NCHCHNCCH2)2C6H3; 1:
Ln = Sc; 2: Ln = Lu; 3: Ln = Sm) were
prepared by in situ treatment of a THF suspension of
2,6-bis(1-mesitylimidazolium methyl)-1-bromobenzene dibromides
((PBNHC-Br)·2HBr) and lanthanide trichlorides (LnCl3) with dropwise
addition of nBuLi at room temperature. The overall molecular
structure of these complexes is an isostructrual monomer of a THF solvate. The
monoanionic xylene-bridged bis(NHC)s bond to the central metal as a tridentate
CCC-pincer moiety in a κC:κC:κC′ mode, which, in combination with the two trans-located
bromo units, generates a twisted tetragonal-bipyramidal geometry.
