Rare-Earth-Metal/Platinum Heterobinuclear Complexes Containing Reactive Ln-alkyl groups (Ln = Y, Lu): Synthesis, Structural Characterization, and Reactivity

2009 ◽  
Vol 28 (24) ◽  
pp. 6861-6870 ◽  
Author(s):  
Yumiko Nakajima ◽  
Zhaomin Hou
Keyword(s):  
Rare Earth ◽  
Structural Characterization ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Alkyl Groups

scholarly journals Unprecedentedly High Activity and/or High Regio-/Stereoselectivity of Fluorenyl-Based CGC Allyl-Type η3:η1-tert-Butyl(dimethylfluorenylsilyl)amido Ligated Rare Earth Metal Monoalkyl Complexes in Olefin Polymerization

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 836
Author(s):  
Ge Guo ◽  
Xiaolu Wu ◽  
Xiangqian Yan ◽  
Li Yan ◽  
Xiaofang Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Active Species ◽  
Metal Centers ◽  
Tert Butyl ◽  
Alkyl Groups ◽  
Elemental Analyses ◽  
Catalytically Active ◽  
Geometry Configuration

A series of fluorenyl-based constrained-geometry-configuration (CGC) allyl-type rare earth metal monoalkyl complexes bearing the divalent anionic η3:η1-tert-butyl(dimethylfluorenylsilyl)amido (η3:η1-FluSiMe2NtBu) ligand (η3:η1-FluSiMe2NtBu)Ln(CH2SiMe3)(THF)2 (1–3) have been synthesized via the alkane elimination reaction between the FluHSiMe2NHtBu ligand and rare earth metal tri(trimethylsilylmethyl) complexes Ln(CH2SiMe3)3(THF)n. Their structures are characterized by means of NMR spectrum, elemental analyses, and X-ray diffraction. These complexes 1–3 are isostructural and isomorphous, and each of them adopts a distorted-trigonal-bipyramidal configuration containing one η3:η1-FluSiMe2NtBu ligand, one CH2SiMe3 ligand, and two THF molecules. Unlike traditional CGC allyl-type rare earth metal complexes showing no or low activity and regio-/stereoselectivity in styrene or MMA polymerization, these complexes 1–3 exhibit high catalytic activities and/or high regio-/stereoselectivities in the cis-1,4-polymerization of isoprene and myrcene or in the syndiotactic polymerization of styrene under the aid of different activators (borate or borane) and AlR3. The in situ 1H NMR spectra suggest that the exchanges of chelating ligands such as alkyl groups and divalent anionic η3:η1-FluSiMe2NtBu ligands between rare earth metal centers and Al centers result in the formation of a heterobimetallic tetraalkylaluminate complex R2Al(μ-R)2Ln(R)(μ-R)2AlR2, which is activated by activators to form a divalent cationic species [Ln(μ-R)2AlR2]2+ as a catalytically active species in the coordination–insertion polymerization of olefins.

Rare-Earth Metal Alkyl, Amido, and Cyclopentadienyl Complexes Supported by Imidazolin-2-iminato Ligands: Synthesis, Structural Characterization, and Catalytic Application⊥

2010 ◽  
Vol 49 (5) ◽  
pp. 2435-2446 ◽  
Author(s):  
Alexandra G. Trambitas ◽  
Tarun K. Panda ◽  
Jelena Jenter ◽  
Peter W. Roesky ◽  
Constantin Daniliuc ◽  
...  
Keyword(s):  
Rare Earth ◽  
Structural Characterization ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Catalytic Application ◽  
Cyclopentadienyl Complexes

Bis(imidazolin-2-iminato) Rare Earth Metal Complexes: Synthesis, Structural Characterization, and Catalytic Application

2012 ◽  
Vol 51 (12) ◽  
pp. 6753-6761 ◽  
Author(s):  
Alexandra G. Trambitas ◽  
Daniel Melcher ◽  
Larissa Hartenstein ◽  
Peter W. Roesky ◽  
Constantin Daniliuc ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Complexes ◽  
Structural Characterization ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Catalytic Application ◽  
Rare Earth Metal Complexes

Synthesis, Structural Characterization, and Reactivity of Mono(amidinate) Rare-Earth-Metal Bis(aminobenzyl) Complexes

2013 ◽  
Vol 32 (24) ◽  
pp. 7312-7322 ◽  
Author(s):  
Jianquan Hong ◽  
Lixin Zhang ◽  
Kai Wang ◽  
Zhenxia Chen ◽  
Limin Wu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Structural Characterization ◽  
Rare Earth Metal ◽  
Earth Metal

Cationic Rare-Earth Metal Trimethylsilylmethyl Complexes Supported by THF and 12-Crown-4 Ligands:  Synthesis and Structural Characterization

2005 ◽  
Vol 44 (19) ◽  
pp. 6777-6788 ◽  
Author(s):  
Benjamin R. Elvidge ◽  
Stefan Arndt ◽  
Peter M. Zeimentz ◽  
Thomas P. Spaniol ◽  
Jun Okuda
Keyword(s):  
Rare Earth ◽  
Structural Characterization ◽  
Rare Earth Metal ◽  
Earth Metal
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