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Synthesis, Characterization, and Catalytic Activity of Some Neodymium(III), Ytterbium(II), and Europium(II) Complexes with Pyrrolidinyl‐ and Piperidinyl‐Functionalized Indenyl Ligands
Author(s) -
Zhou Shuangliu,
Wang Shaowu,
Sheng Enhong,
Zhang Lijun,
Yu Zeyan,
Xi Xiaobing,
Chen Guodong,
Luo Wei,
Li Yan
Publication year - 2007
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200601102
Subject(s) - chemistry , toluene , yield (engineering) , medicinal chemistry , europium , ytterbium , indene , lanthanide , stereochemistry , catalysis , organic chemistry , ion , materials science , physics , optoelectronics , doping , metallurgy
A series of organolanthanide complexes with pyrrolidinyl‐ and piperidinyl‐ functionalized indenyl ligands were synthesized by reaction of [(Me 3 Si) 2 N] 3 Ln III (μ‐Cl)Li(THF) 3 (Ln = Yb, Eu, Nd) with the corresponding indene compounds. Treatment of [(Me 3 Si) 2 N] 3 Yb III (μ‐Cl)Li(THF) 3 with 2 equiv. of C 9 H 6 ‐1‐R‐3‐CH 2 SiMe 2 NC 4 H 8 (R = H, CH 3 ) in refluxing toluene produced the corresponding organoytterbium(II) complexes with formula [η m :η 1 ‐C 9 H 5 ‐1‐R‐3‐CH 2 SiMe 2 NC 4 H 8 ] 2 Yb II [ m = 5, R = H ( 2 ); m = 3, R = CH 3 ( 3 )] in 49 and 58 % yield, respectively. Treatment of [(Me 3 Si) 2 N] 3 Ln III (μ‐Cl)Li(THF) 3 (Ln = Yb, Eu, Nd) with 2 equiv. of C 9 H 7 CH 2 SiMe 2 NC 5 H 10 ( 1 ) in toluene at moderately high temperatures afforded, after workup, the corresponding organolanthanide complexes with formula [η 5 :η 1 ‐C 9 H 6 CH 2 SiMe 2 NC 5 H 10 ] 2 Yb II ( 4 ), [η 5 :η 1 ‐C 9 H 6 CH 2 SiMe 2 NC 5 H 10 ] 2 Eu II ( 5 ), and [C 9 H 6 CH 2 SiMe 2 NC 5 H 10 ] 3 Nd III · THF ( 6 ) in 37, 71, and 29 % yield, respectively. All the compounds were fully characterized by spectroscopic methods and elemental analyses. The structures of complexes 2 , 3 , 5 , and 6 were additionally determined by single‐crystal X‐ray analyses. The catalytic properties of all the organolanthanide complexes on the ring‐opening polymerization of ϵ‐caprolactone have been studied. The effects of temperature, solvent, and coordination on the catalytic activities of the complexes were examined. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)