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Synthesis of the first rare earth metal bis(alkyl)s bearing an indenyl functionalized N-heterocyclic carbene
Treatment of indenyl-modified imidazolium bromide [C9H7CH2CH2(NCHCHN(C6H2Me3-2,4,6)CH)Br] ((IndH-NHC-H)Br) with rare earth metal tetra(alkyl) lithium (Ln(CH2SiMe3)4Li(THF)4) or with (trimethylsilylmethyl)lithium (LiCH2SiMe3) and rare earth metal tris(alkyl)s (Ln(CH2SiMe3)3(THF)2) sequentially afforded the first NHC-stabilized monomeric rare earth metal bis(alkyl) complexes (Ind-NHC)Ln(CH2SiMe3)2...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11926.html |
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3,4-Polymerization of Isoprene by Using NSN- and NPN-Ligated Rare Earth Metal Precursors: Switching of Stereo Selectivity and Mechanism
The rare-earth metal complexes bearing NSN-bidentate β-diimidosulfonate ligands (RNSNdipp)Ln(CH2SiMe3)2(THF)n (R = Ph, Ln = Lu (1a), n = 1, Y (1b), n = 2, Sc (1c), n = 1; R = PhNMe2, Ln = Lu (1d), n = 1) were synthesized by treatment of the ion-pairs [Ln(CH2SiMe3)2(THF)x][BPh4] with equimolar amount of the ligand lithium salts (RNSNdipp)Li(THF)2 ...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11919.html |
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Highly 3,4-selective living polymerization of isoprene with rare earth metal fluorenyl N-heterocyclic carbene precursors
Fluorenyl modified N-heterocyclic carbene ligated rare earth metal bis(alkyl) complexes, (Flu-NHC)Ln(CH2SiMe3)2 (Flu-NHC = (C13H8CH2CH2(NCHCCHN)C6H2Me3-2,4,6); Ln = Sc (1a); Ln = Y (1b); Ln = Ho (1c); Ln = Lu (1d)), were synthesized and fully characterized by NMR and X-ray diffraction analyses. Complexes 1b?d with the activation of AliBu3 and [Ph3C][B(C6F5)4] exhibited high a...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11915.html |
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24. Synthesis of siloxane-modified melamine-formaldehyde microsphere and its heavy metal ions adsorption by coordination effects
Microspheres could be utilized in the industrial waste water treatment due to their huge specific surface areas and surficial functional groups, which possibly adsorb heavy metal ions in the industrial waste. Melamine-formaldehyde (MF) microspheres were easily prepared as mono-dispersed micro-sized particles with a smooth surface. However, these rich amine groups in MF m...
http://www.polymer.cnt//ss/ghgao/publicationsshow_11905.html |
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ansa-Rare-Earth-Metal Catalysts for Rapid and Stereoselective Polymerization of Renewable Methylene Methylbutyrolactones
Two ansa-half-sandwich rare-earth-metal (REM) dialkyl complexes supported by an ethylene-bridged fluorenyl (Flu)-N-heterocyclic carbene (NHC) ligand, [M{C2H4(η5-Flu-κ1-NHC)}(CH2SiMe3)2] (M=Y, 1; Lu, 2), and a chiral ansa-sandwich samarocene incorporating a C2 ligand, [Sm(η5-C12H8)2(thf)2] (3), have been investigated for the coordination–addition polymerization o...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11895.html |
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Isoprene polymerization with aminopyridinato ligand supported rare-earth metal complexes. Switching of the regio- and stereoselectivity
The highly cis-1,4, trans-1,4 and 3,4-selective polymerizations of isoprene were successfully regulated by simply modifying the auxiliary ligands, metal centres and initiation groups of rare-earth metal complexes and cocatalysts.
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11887.html |
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Nature of the Entire Range of Rare Earth Metal-Based Cationic Catalysts for Highly Active and Syndioselective Styrene Polymerization
Because of the steric bulkiness and the eta(5)/kappa(1)-constrained-geometry-configuration (CGC) geometry, the entire range of pyridyl-methylene-fluorenyl-stabilized rare earth metal bisalkyl complexes, (Flu-CH2-Py)Ln(CH2SiMe3)(2)(THF)(x) (Flu = fluorenyl; Py = pyridyl; for 1, Ln = Sc and x = 0; for 2-11, Ln = Lu, Tm, Er, Ho, Y, Dy, Tb, Gd, Nd, or Pr and x = 1), and monoalkyl complex, (Flu-CH2-P...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11886.html |
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Highly Isoselective Coordination Polymerization of ortho- Methoxystyrene with b-Diketiminato Rare-Earth-Metal Precursors**
Stereoselective coordination/insertion polymerization of the polar ortho-methoxystyrene has been achieved for the first time by using the cationic b-diketiminato rareearth-metal species. High activity and excellent isoselectivity (mmmm>99%) were acheived. The unmasked Lewis-basic methoxy group does not poison the Lewis-acidic metal center, but instead activates the po...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11884.html |
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Constructing metal nanoparticle multilayers with polyphenylene dendrimer/gold nanoparticles via “click” chemistry.
Multi layer films composed of azide-functional polymer and polyphenylene dendrimer-stabilized gold nanoparticles with alkynes in their peripheries have been fabricated using a layer-by-layer (LBL) approach via "click" chemistry. This method permits facile covalent linking of the polymer/nanoparticle interlayers in the mixture of DMF and water, which provides a general and powerful technique for pr...
http://www.polymer.cnt//ss/yumm/publicationsshow_11851.html |
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Poly(phenylene sulfide)/low-melting-point metal composites. I. Transient viscoelastic properties and crystallization kinetics
Poly(phenylene sulfide)/low-melting-point metal composites (PPSMs) with various loading levels were prepared by melt compounding. The nonisothermal crystallization behavior and transient viscoelastic properties were characterized by the DSC, POM, DMA, and parallel-plate rheometer. The results reveal that the low-melting-point metal (LMPM) particles show nice dispersion at relative low content leve...
http://www.polymer.cnt//ss/zhangming/publicationsshow_10672.html |
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