Synthesis, characterization of some organolanthanide complexes containing 2-pyridylmethyl substituted fluorenyl ligand and catalytic activity of organolanthanide(II) complexes

Miao, Hui; Wang, Shaowu; Zhou, Shuangliu; Wei, Yun; Zhou, Zikai; Zhu, Hong; Wu, Shihong; Wang, Hui

doi:10.1016/j.ica.2009.12.058

Cited by 9 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aliphatic polyesters are an important class of biodegradable polymer materials because of their biodegradability, biocompatibility and permeability . Polycaprolactone (PCL) stands out from the crow owing to its superior rheological and viscoelastic properties over those of other biopolymers which renders it easy to manufacture and manipulate into a large variety of implants and devices . Numbers of organometallic catalysts, such as alkali metals, alkaline earth metals, transition metals and rare earth metals, have been explored for ring‐opening polymerization (ROP) of polycaprolactone.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structure of para‐toluene sulfonamide lanthanide complexes and their application in the polymerization of ε‐caprolactone

Wang

Peng

Cen

et al. 2017

Applied Organom Chemis

View full text Add to dashboard Cite

A series of para-toluene sulfonamide ligands [TsNHPr-i(HL 1 ), TsNHBu-t(HL 2 ), TsNHPh(HL 3 ), TsNHPhMe-p(HL 4 ), TsNHPhOMe-p(HL 5 )] were synthesized by amidation using para-toluene sulfonyl chloride reacting with different primary amines. A series of homoleptic lanthanide complexes (Ln L 3 , 1-10) (Ln = La, L = L 1 (1), Ln = Gd, L = L 2 (2), Ln = La, L = L 2 (3), Ln = Gd, L = L 2 (4), Ln = La, L = L 3 (5), Ln = Gd, L = L 3 (6), Ln = La, L = L 4 (7), Ln = Gd, L = L 4 (8), Ln = La, L = L 5 (9), Ln = Gd, L = L 5 (10)) were prepared by amine elimination reactions of the ligands with Ln[N(SiMe 3 ) 2 ] 3 (Ln = La, Gd). Complexes 1, 3, 5, 7 and 9 were all characterized by NMR spectra, and the structures of complex 3 was determined by single-crystal X-ray diffraction. Complex 3 crystallizes a binuclear cluster, consisting of two La 3+ and six (TsNBu-t) − anions. Three (TsNBu-t) − anions are chelating to each La 3+ as bidentate model with O and N forming three-membered chelate rings; one of three anions is bridging to another La 3+ via oxygen. All complexes were characterized using elemental analysis and infrared spectra. The catalytic properties of complexes 1-10 for the ring-opening polymerization of εcaprolactone were studied and the results showed that all complexes are efficient initiators for this ring-opening polymerization reaction.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and structure of para‐toluene sulfonamide lanthanide complexes and their application in the polymerization of ε‐caprolactone

Wang

Peng

Cen

et al. 2017

Applied Organom Chemis

View full text Add to dashboard Cite

show abstract

“…For example, the bis(methylcyclopentadienyl)ytterbium methyl complex [(MeC 5 H 4 ) 2 YbMe] 2 was slowly reduced to the divalent ytterbocene (MeC 5 H 4 ) 2 Yb in hot toluene . Reactions of lanthanide amides Ln[N(SiMe 3 ) 2 ] 3 (μ-Cl)Li(THF) 3 (Ln = Yb, Eu) with indenes or fluorenes bearing pendant amine or ether functional groups resulted in spontaneous reduction to the corresponding divalent lanthanocene complexes . It is noteworthy that treatment of the europium amide Eu[N(SiMe 3 ) 2 ] 3 (μ-Cl)Li(THF) 3 with pyrrolyl-functionalized secondary amines also led to the reduction of Eu(III) to Eu(II), which is a spontaneous reduction that occurred with a non-cyclopentadiene-based system.…”

mentioning

confidence: 99%

Synthesis and Structural Characterization of Mixed-Valent Ytterbium and Europium Complexes Supported by a Phenoxy(quinolinyl)amide Ligand

et al. 2014

View full text Add to dashboard Cite

The formation of mixed-valent ytterbium and europium complexes L4LnIII 2LnII (Ln = Yb (1), Eu (2)) was observed for the first time in the spontaneous reduction reaction system of quinolinyl aminophenol (H2L) with Ln[N(SiMe3)2]3 (Ln = Yb, Eu) in toluene at 90 °C, whereas the same reaction with Sm[N(SiMe3)2]3 gave the expected monoamido samarium complex LSmN(SiMe3)2(DME) (4). The isolation of the binuclear ytterbium complex L3Yb2 (3) under mild conditions demonstrates that the transformation from a trivalent ytterbium complex to the mixed-valent ytterbium species 1 may involve a ligand redistribution reaction and homolysis of the Yb–N bond.

show abstract

Developments in the Coordination Chemistry of Europium(II)

Garcia

Allen

2012

Eur J Inorg Chem

View full text Add to dashboard Cite

Recent advances in the coordination chemistry of Eu2+ are reviewed. Common synthetic routes for generating discrete Eu2+-containing complexes reported since 2000 are summarized, followed by a description of the reactivity of these complexes and their applications in reduction chemistry, polymerization, luminescence, and as contrast agents for magnetic resonance imaging. Rapid development of the coordination chemistry of Eu2+ has led to an upsurge in the utilization of Eu2+-containing complexes in synthetic chemistry, materials science, and medicine.

show abstract

Synthesis, characterization of some organolanthanide complexes containing 2-pyridylmethyl substituted fluorenyl ligand and catalytic activity of organolanthanide(II) complexes

Cited by 9 publications

References 31 publications

Synthesis and structure of para‐toluene sulfonamide lanthanide complexes and their application in the polymerization of ε‐caprolactone

Synthesis and structure of para‐toluene sulfonamide lanthanide complexes and their application in the polymerization of ε‐caprolactone

Synthesis and Structural Characterization of Mixed-Valent Ytterbium and Europium Complexes Supported by a Phenoxy(quinolinyl)amide Ligand

Developments in the Coordination Chemistry of Europium(II)

Contact Info

Product

Resources

About