A5100774913- Organometallic Complex Synthesis and Catalysis
- Carbon dioxide utilization in catalysis
- Asymmetric Hydrogenation and Catalysis
- Synthetic Organic Chemistry Methods
- Catalytic Alkyne Reactions
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- biodegradable polymer synthesis and properties
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Crystallization and Solubility Studies
- Advanced Polymer Synthesis and Characterization
- Ammonia Synthesis and Nitrogen Reduction
- Electrochemical Analysis and Applications
- Radioactive element chemistry and processing
- Crystallography and molecular interactions
- Pharmacological Effects of Natural Compounds
- Aerogels and thermal insulation
- X-ray Diffraction in Crystallography
- Advanced Condensed Matter Physics
- Catalytic C–H Functionalization Methods
- Advanced Photocatalysis Techniques
- CO2 Reduction Techniques and Catalysts
- Organoboron and organosilicon chemistry
- Synthesis and characterization of novel inorganic/organometallic compounds
Hunan University of Technology
2025
Central South University
2025
Lanzhou University
2025
University of Science and Technology of China
2021-2024
Institute of Solid State Physics
2021-2024
Chinese Academy of Sciences
2011-2024
Hebei University of Technology
2024
Shanghai Advanced Research Institute
2023
Shantou University
2022
Shanghai Institute of Organic Chemistry
2011-2021
The most ubiquitous polymer, polyethylene (PE), is produced either through a radical-initiated process or, more commonly, coordination/insertion employing early transition metal catalysts, particularly titanium- and chromium-based systems. These oxophilic catalysts are not functional-group-tolerant thus cannot be used to synthesize copolymers of ethylene polar vinyl monomers such as alkyl acrylates acetate. Such PE have enhanced properties relative made radical polymerization processes,...
Copolymerizations of ethylene with vinyltrialkoxysilanes are reported using both a "traditional" cationic Pd(II) aryldiimine catalyst, t-1 (aryl = 2,6-diisopropylphenyl), and "sandwich-type" s-2 8-tolylnaphthyl). Incorporation levels between 0.25 2.0 mol % were achieved remarkably little rate retardation relative to homopolymerizations. In the case traditional catalyst system, molecular weights decrease as level comonomer increases only one trialkoxysilyl group is incorporated per chain....
Neutral nickel methyl complexes incorporating 2,8-diarylnaphthyl groups have been synthesized and characterized. Salicylaldiminato systems 1a,b are exceptionally active neutral single component catalysts for the polymerization of ethylene capable producing lightly branched ultrahigh-molecular-weight polyethylene (UHMWPE). In addition, complex 1a shows a "quasi-living" behavior.
Copolymerizations of ethylene with vinyltrialkoxysilanes using cationic (α-diimine)Ni(Me)(CH3CN)+ complexes 4a,b/B(C6F5)3 yield high molecular weight copolymers exhibiting highly branched to nearly linear backbones depending on reaction conditions and catalyst choice. Polymerizations are first-order in pressure inverse-order silane concentration. Microstructural analysis the reveals both in-chain chain-end incorporation −Si(OR)3 groups whose ratios depend temperature pressure. Detailed...
Abstract Ethylene/polar monomer coordination copolymerization offers an attractive way of making functionalized polyolefins. However, ethylene with industrially relevant short chain length alkenoic acid remain a big challenge. Here we report the efficient direct vinyl acetic by tetranuclear nickel complexes. The protic can be extended to acrylic acid, allylacetic ω-alkenoic allyl alcohol, and homoallyl alcohol. Based on X-ray analysis precatalysts, control experiments, solvent-assisted...
A series of titanium complexes bearing [ONX] tridentate ligands have been synthesized and characterized. The containing sulfur or phosphine donors showed high activity in the copolymerization ethylene with 9-decen-1-ol (up to 1.3 × 108 g polymer (mol Ti)−1 h–1) an incorporation ratio up 8.8 mol %. Moreover, they also shown excellent capability for AlBui3 (or tert-butylchlorodimethylsilane) pretreated 4-penten-1-ol, ω-alkenoic acid, ester, as well unprotected tertiary amine.
This study investigates the structural stability of small Pd@Pt core@shell octahedral nanoparticles (NPs) and their shell thickness dependent catalytic performance for p-chloronitrobenzene hydrogenation with H2. The 6–8 nm NPs are prepared by a sequential reduction method, characterization results confirm that one to four atomic Pt layers can be controllably synthesized. layer demonstrate excellent maintenance core–shell structures as well high during cycle reactions. alumina-supported...
Traditional cationic Pd(II) and Ni(II) ethylene polymerization catalysts are supported by ortho-disubstituted aryl diimine ligands. These capable of producing high-molecular-weight polyethylene due to positioning bulk in the two axial sites square coordination plane which retards chain transfer. Similar pyridine-imine complexes bearing a single imine moiety were reported yield very low Mn polyethylene. In earlier studies, "sandwich" nickel incorporating 8-arylnaphthylimino groups provide...
Pd@SiO2 core–shell nanoparticles were successfully synthesized by a sol–gel method. Tetradecyl trimethyl ammonium bromide capped Pd coated with SiO2 through the hydrolysis of tetraethylorthosilicate. The as-synthesized particles consist cores particle size 3.7 nm and shells thickness from 10 to 30 at different synthetic conditions. nanocatalysts 1.9–2.4 mesoporous generated after removal tetradecyl calcination following H2 reduction. relevant characterizations such as XRD, TEM, FT-IR, BET...
A new cationic [N–O–S]zirconium complex (cat.) was developed to be an excellent catalyst for the intramolecular hydroamination of aminoalkenes with a large substrate scope from terminal alkenes internal alkenes, and primary amines secondary amines. The system can also tolerate various functional groups perform sequential aminodienes.
Abstract The successful application of gallium trichloride as a catalyst for the intermolecular hydroamination alkynes with aromatic amines is reported. reaction effective many aniline derivatives and shows exclusive selectivity Markovnikov products. mechanism transformation was investigated by DFT calculations plausible pathway proposed.
Reaction of the bis-ligand-chelated samarium complex [Sm(Hbptd)(H2bptd)] (1; H3bptd =1,9-bis(2-pyrrolyl)-2,5,8-triazanona-1,8-diene), in which a pyrrolyl ring is dangling and metal-free, with Ti(NMe2)4 yielded heterometallic [Sm(Hbptd)(THF)(bptd)Ti(NMe2)2] (2). Treatment ligand 1 equiv gave titanium amido [Ti(bptd)(NMe2)] (3). Complexes 2 3 were able to catalyze hydroamination phenylacetylene 2,4-dichloroaniline 4-methoxyaniline, high regioselectivities observed for two amines. Both active...
ABSTRACT A series of [O − N(H)X]TiCl 3 complexes derived from (arylamino)methylene phenol are prepared. The molecular structures the characterized by 1 H NMR, 13 C and X‐ray analysis. Upon activation with modified methylaluminoxane (MMAO), titanium display high thermal stability single‐site like ethylene (co)polymerization behavior at temperatures up to 150 °C. 1‐Octene 1‐octadencene prove suitable be incorporated into polyethylene backbone 110 °C highest activity 1.89 × 10 6 g/mol(Ti)·h·atm...
A series of new titanium and zirconium amido complexes, incorporating 4,5-diphenyl-2-(2-pyridinyl)-1H-imidazole (HL1), 4,5-bis(4-chlorophenyl)-2-(2-pyridinyl)-1H-imidazole (HL2), 4,5-bis(4-methoxyphenyl)-2-(2-pyridinyl)-1H-imidazole (HL3) 4,5-bis(2-methoxyphenyl)-2-(2-pyridinyl)-1H-imidazole) (HL4) as the ancillary ligands, have been prepared are shown to be pre-catalysts for hydroamination alkynes. Treatment Ti(NMe2)4 with 1 equivalent HL1, HL2, HL3 HL4, respectively, results in...
Highly efficient copolymerization of ethylene/5-(perfluoro-<italic>n</italic>-alkyl)norbornenes has been realized for the synthesis fluorinated COC first time.
Epitaxial La-doped BaSnO3 (BLSO) thin films were fabricated on a SrTiO3 (100) substrate by cost-efficient and scalable solution deposition method. Microstructures optoelectronic properties of the BLSO can be controlled metal cation concentration (MCC) initially used precursor solution. It is found that with denser microstructure, lower resistivity, higher optical transmittance, good thermal stability obtained from MCC. The growth mechanisms initial nucleation are explained in detail for...
We propose a novel design of hybrid multi-band wavelength/polarization/mode (de)multiplexer based on 800 nm thick Si <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{3}$</tex-math></inline-formula> N notation="LaTeX">$_{4}$</tex-math></inline-formula> platform. The 16 channels are enabled by asymmetric rib polarization beam splitters, subwavelength rotators and directional couplers, consisting two...
Vacuum insulation panel is regarded as one of the most promising high performance thermal materials for green building. It has extremely low conductivity and its a factor four to eight times better than that conventional such mineral wool or polymer foams. The resistivity VIP provides new solutions slim but still energy efficient building envelopes. Although widely been used in refrigerators freezers long time, it only recently discovered by sector. There not yet any alternative many...