期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 12, 期 20, 页码 5320-5327出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200600058
关键词
guanidinate ligands; homogeneous catalysis; hydrides; lanthanides; polymerization
The new family of Lewis base free hydrido complexes of rareearth metals supported by guanidinate ligands [{Ln{(Me3Si)(2)NC(NiPr)(2)}(2)(mu H)}2] (Ln=Y, Nd, Sm, Gd, Yb) was synthesized and structurally characterized. Single-crystal X-ray and solution NMR studies revealed that these complexes are dimeric in both solid state and in [D-6]benzene. The dimeric hydrido complexes can adopt eclipsed (Nd, Sm, Gd) or staggered (Y, Yb, Lu) conformations depending on the metal atom size. Catalytic activity of these [{Ln{(Me3Si)(2)NC(NiPr)(2)}(2)(mu-H)}(2)] complexes in the polymerization of ethylene, propylene, and styrene has been investigated. Complexes of Sm and Y have high catalytic activity in ethylene polymerization (1268 and 442 gmmol(-1)atm(-1)h(-1), respectively).
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