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Lanthanocene Complexes (lanthanocene + complex)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Synthesis, structure characterization and catalytic activity of lanthanide complexes containing an ansa carbonous-bridged cyclopentadienyl,thienyl ligand

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 1 2009
Xiaomin Xie
Abstract A kind of new lanthanocene complex with an ansa carbonous-bridged cyclopentadienyl/aromatic heterocycle ligand was prepared and characterized. Based on the data of elemental analyses, MS and IR, they were presumed to be solvent-free complexes (cyclo-C4H3SCMe2C5H4)2LnCl [Ln = Er (1), Dd (2), Y (3), Sm (4)]. These complexes were effective for the polymerization of methyl methacrylate in the presence of co-catalyst. When AlEt3 and NaH (nanometric) were used as different co-catalysts, the lanthanocene complexes 1,4 showed different catalytic behavior. These differences resulted from the formation of different active species. The catalyst system (cyclo-C4H3SCMe2C5H4)2LnCl/NaH (nanometric) showed high catalytic activity (yield , 95% and M, > 105) in a short time at the ambient temperature. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Synthesis, characterization and catalytic applications of tridentate Schiff base derivatives of bis and mono(cyclopentadienyl)-lanthanocene complexes

CHINESE JOURNAL OF CHEMISTRY, Issue 5 2000
Muhammad Yousaf
Abstract Seven kinds of lanthanocene complexes were prepared by the reaction of tridentate Schiff base | N -(2-methoxyphenyl)salicylideneamine with tris(cyclopentadienyl) lanthanide tetrahydrofuranate or bis (cyclopentadienyl) lanthanide chloride tetrahydrofuranate in THF. All the complexes were characterized by MS, EA and IR respectively. The structure of |Cp2LnC14U13NO2) Ln = Sm, Dy, Y, Er| (1,4) was further confirmed by X-ray determination of Cp2Sm(C14H13NO2) (1) which indicates that the complex is monomeric in which central metal is coordinatively saturated by two cyclopentadienyl rings, two oxygens and one nitrogen of the ligand. The isomerization of 1,5-hexadiene explains that complexes (1,4) isomerize this monomer into a mixture of 1,4-hexadiene, 2,4-hexadiene, 1,3-hexadiene, methylenecyclopentane and methyl,cyclopentene. Similarity complexes |CpLn(a) C14 H13NO2) (THF) (Ln=Sm, Dy, Y, Er)| (5,7) polymerize methyl-methacrylate (MMA) to give polyMMA (PMMA) in 51.8% yield and high molecular weight (274 × 103), which shows narrow molecular weight distributions and partially syndiotactic. [source]