期刊
ORGANOMETALLICS
卷 27, 期 21, 页码 5438-5440出版社
AMER CHEMICAL SOC
DOI: 10.1021/om800801k
关键词
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资金
- The National Natural Science Foundation of China [20571072, 20674081]
- The Ministry of Science and Technology of China [2005CB623802]
- CAS
The first xylene-bridged bis(N-heterocyclic carbene) (bis(NHC))-ligated CCC-pincer rare-earth metal dibromides (PBNHC)LnBr(2)(THF) (PBNHC = 2,6-(2,4,6-Me3C6H2NCHCHNCCH2)(2)C6H3; 1: Ln = Sc; 2: Ln = Lu; 3: Lu = Sm) were prepared by in situ treatment of a THF suspension of 2,6-bis(1-mesitylimidazolium methyl)-1-bromobenzene dibromides ((PB-NHC-Br) center dot 2HBr) and lanthanide trichlorides (LnCl(3)) 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 kappa C:kappa C:kappa C' mode, which, in combination with the two trans-located bromo units, generates a twisted tetragonal-bipyramidal geometry.
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