期刊
DALTON TRANSACTIONS
卷 40, 期 37, 页码 9447-9453出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10622h
关键词
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资金
- National Natural Science Foundation of China [20832001, 20802001, 21072004]
- Ministry of Education [20103424110001]
- Anhui province [TD 200707, 2007Z016, 11040606M36]
Simple silylamine elimination reactions of calix[4]-pyrrole [R(2)C(C(4)H(2)NH)](4) (R = Me (1), {-(CH(2))(5)-}(0.5) (2)) with 2 equiv. of [(Me(3)Si)(2)N](3)Ln(mu-Cl)Li(THF)(3) (Ln = Nd, Sm, Dy) in reflux toluene, afforded the novel dinuclear alkali metal-free trivalent lanthanide amido complexes (eta(5):eta(1):eta(5):eta(1)-R(8)-calix[4]-pyrrolyl){LnN(SiMe(3))(2)}(2) (R = Me, Ln = Nd (3), Sm (4), Dy (5); R = {-(CH(2))(5)-}(0.5), Ln = Nd (6), Sm(7)). The complexes were fully characterized by elemental analyses, spectroscopic analyses and single-crystal X-ray analyses. X-ray diffraction studies showed that each lanthanide metal was supported by bispyrrolyl anions in an eta(5) fashion and along with three nitrogen atoms from N(SiMe(3))(2) and two other pyrroyl rings in eta(1) modes formed the novel bent-sandwiched lanthanide amido bridged trivalent lanthanide amido complexes, similar to ansa-cyclopentadienyl ligand-supported lanthanide amides with respect to each metal center. The catalytic activities of these organolanthanide complexes as single component L-lactide polymerization catalysts were studied.
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