Vanadium chlorides supported by BIAN (BIAN = bis(arylimo)-acenaphthene) ligands: Synthesis, characterization, and catalysis on ethylene polymerization
| Autor: | Xue-meng Chen, Li-cheng Huang, Shu-yun Xu, Feng Li, Wei Gao |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
010405 organic chemistry Ligand Acenaphthene Vanadium chemistry.chemical_element Polymer 010402 general chemistry 01 natural sciences Medicinal chemistry 0104 chemical sciences Catalysis Inorganic Chemistry Metal chemistry.chemical_compound chemistry visual_art Octahedral molecular geometry Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Diimine |
| Zdroj: | Polyhedron. 164:146-151 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2019.01.041 |
| Popis: | Several vanadium chlorides bearing bis(arylimino)-acenaphthene (BIAN) ligands, (2,6-Me2C6H3-BIAN)V(THF)Cl3 (1), (2,6-Et2C6H3-BIAN)V(THF)Cl3 (2), (2,6-iPr2C6H3-BIAN)V(THF)Cl3 (3), [3,5-(CF3)2C6H3-BIAN]V(THF)Cl3 (4), [4-OMe-C6H4-BIAN]V(THF)Cl3 (5), and [2,6-(Ph2CH)2-4-OMeC6H2-BIAN]V. (THF)Cl3 (6) were synthesized by direct reaction of VCl3(THF)3 with corresponding BIAN ligands. All these complexes were characterized by elemental analyses, and FT-IR spectroscopy. The molecular structures of 1, 2, and 4 were identified by X-ray crystallography, in which the six-coordinated vanadium metal centers were in distorted octahedral geometry with the oxygen atom of the coordinated THF, two nitrogen atoms of the diimine ligand and one chlorine atom in the same plane. When activated with AlEt2Cl these vanadium complexes showed high catalytic activities for ethylene polymerization affording linear polyethylene with high molecular weight. However, when MAO was used as co-catalyst, ultra high molecular-weight polymers were obtained albeit with decreased activity. |
| Databáze: | OpenAIRE |
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