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Synthesis, Structure, and Catalytic Behavior of Ytterbium Complexes Derived from a Linked Bis(β‐ketoiminato) Ligand
Author(s) -
Fan Lingling,
Wang Yaorong,
Yao Yingming,
Wu Bing,
Shen Qi
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200565
Subject(s) - ytterbium , chemistry , ligand (biochemistry) , amide , catalysis , yield (engineering) , polymerization , medicinal chemistry , polymer chemistry , crystallography , organic chemistry , materials science , receptor , polymer , biochemistry , optoelectronics , doping , metallurgy
Ytterbium complexes supported by a linked bis(β‐ketoiminato) ligand, N , N ′‐ethylenebis(benzoylacetoimine) (H 2 L), were synthesized and their catalytic behavior was explored. The reaction of YbCl 3 with 1 equiv. of LLi 2 afforded the mononuclear ytterbium chloride LYbCl(THF) 2 ( 1 ) in high yield. Complex 1 can be used as starting material to prepare β‐ketoiminate‐ytterbium derivatives. Treatment of complex 1 with NaN(SiMe 3 ) 2 produced the dimeric ytterbium amide {LYb[N(SiMe 3 ) 2 ]} 2 ( 2 ), while the similar reaction of complex 1 with NaOAr (ArO = 2, 6‐ t Bu‐4‐MeC 6 H 2 O) led to the mononuclear ytterbium aryloxide LYbOAr(THF) ( 3 ). The three complexes were well detected by elemental analysis and single‐crystal X‐ray analysis. It was found that complexes 2 and 3 can initiate the ring‐opening polymerization of ϵ‐caprolactone with moderate activity.