Unlock instant, AI-driven research and patent intelligence for your innovation.

Dinuclear rare earth catalyst as well as preparation method and application thereof

A rare earth catalyst and reagent technology, applied in the field of dual-nuclear rare earth catalyst and its preparation, can solve the problems of long distance between rare earth metal centers and limited synergy effect, etc.

Active Publication Date: 2021-08-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, according to the literature and experimental results, it can be seen that the long-chain group bridged dinuclear rare earth complex has a relatively long distance from the center of the rare earth metal, and the synergy between the two metals is very limited in the process of catalyzing olefin polymerization.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dinuclear rare earth catalyst as well as preparation method and application thereof
  • Dinuclear rare earth catalyst as well as preparation method and application thereof
  • Dinuclear rare earth catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Under anhydrous and oxygen-free conditions, 4 mmol of butyllithium n-hexane solution was slowly dropped into a Schlenk bottle containing 2 mmol of ligand 1 in tetrahydrofuran (10 mL) at -30°C. In addition, add 4mmolSc(CH 2 SiMe 3 ) 3 (THF) 2 In a Schlenk bottle of tetrahydrofuran (4mL) solution, slowly drop 4mmol [Et 3 NH][BPh 4 ] in tetrahydrofuran (5 mL). Subsequently, the two reaction systems continued to react at room temperature for 2 hours. Then the lithium salt solution of Ligand 1 was poured into the alkyl scandium reaction system (Sc(CH 2 SiMe 3 ) 2 (BPh 4 )(THF) n ), and then stirred at room temperature for 30 minutes. Finally, all solvents were removed under vacuum, extracted with 20 mL of toluene, filtered, and the filtrate was collected. After the filtrate was concentrated, it was placed in a refrigerator at -30°C for static crystallization, and the yield of complex 1 was 70%.

[0047]

Embodiment 2

[0049] According to the method of Example 1, using ligand 2 and the corresponding rare earth cation reagent Sc(CH 2 SiMe 3 ) 2 (BPh 4 )(THF) n Reaction to obtain complex 2 with a yield of 72%.

[0050]

Embodiment 3

[0052] According to the method of Example 1, using ligand 3 and the corresponding rare earth cation reagent Sc(CH 2 SiMe 3 ) 2 (BPh 4 )(THF) n Reaction to obtain complex 3 with a yield of 76%.

[0053]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Molecular weightaaaaaaaaaa
Molecular weightaaaaaaaaaa
Molecular weightaaaaaaaaaa
Login to View More

Abstract

The invention provides a binuclear rare earth catalyst for olefin polymerization as well as a preparation method and application of the binuclear rare earth catalyst. The binuclear rare earth catalyst has a structure as shown in a formula I. Compared with a corresponding mononuclear rare earth metal catalyst or long-chain group and rigid group bridged cyclopentadienyl binuclear rare earth catalysts, the binuclear rare earth catalyst disclosed by the invention shows a remarkable bimetallic synergistic effect in a catalysis of an olefin polymerization process.

Description

technical field [0001] The invention belongs to the technical field of metallocene catalysts, and in particular relates to a binuclear rare earth catalyst and a preparation method and application thereof. Background technique [0002] Compared with mononuclear catalysts, binuclear catalysts have unique catalytic effects, such as producing higher molecular weight polymers, obtaining copolymers with high comonomer content, and having higher tolerance to polar monomers, etc. Researchers have invested a lot of energy in the synthesis of binuclear catalysts, and have achieved certain results, especially in the design and synthesis of binuclear Group IV metal catalysts (Chem. Rev. 2011, 111, 2450-2485). However, there are very few reports on dinuclear rare earth catalysts, especially the dinuclear cyanocene-based four-anion rare-earth catalysts with better catalytic performance (one chelating cyanocene ligand and two initiating anion groups on each metal), even less There are ver...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08F4/54C08F112/08C08F210/02C08F110/02C08F210/16C08F212/08C08F212/14C08F210/14C08F236/08C08F232/08C08F236/20C08F210/06
CPCC08F4/545C08F112/08C08F210/02C08F110/02C08F210/16C08F2410/03C08F212/08C08F2500/16C08F212/22C08F210/14C08F236/08C08F232/08C08F236/20C08F210/06
Inventor 李世辉崔冬梅
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI