Citation: Li-Ping GUO, Ren-Yuan SONG. Rare-earth Metal Dialkyl Complexes Supported by 1, 3-Disubstituted Indolyl Ligand: Synthesis, Characterization and Catalytic Activity for Isoprene Polymerization[J]. Chinese Journal of Structural Chemistry, ;2021, 40(8): 1055-1060. doi: 10.14102/j.cnki.0254–5861.2011–3172 shu

Rare-earth Metal Dialkyl Complexes Supported by 1, 3-Disubstituted Indolyl Ligand: Synthesis, Characterization and Catalytic Activity for Isoprene Polymerization

Li-Ping GUO ^{a, b,,} ,
Ren-Yuan SONG ^a

a.
Anhui Provincial Engineering Laboratory of Silicon-based Materials, Bengbu University, Bengbu 233030, China
b.
The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu 241000, China

Corresponding author: Li-Ping GUO, guoliping251@126.com
Received Date: 10 March 2021
Accepted Date: 16 April 2021

Fund Project: the Natural Science Foundation of Anhui Province 2008085ME174financial support from Anhui Normal University FMS201915

Figures(3)

Rare-earth metal dialkyl complexes [1-Bn-3-(DippN=CH)C₈H₄N]RE(CH₂SiMe₃)₂(thf)₂ (Dipp = 2, 6-ⁱPr₂C₆H₃, RE = Y (1) and Er (2)) were prepared through the cyclometalation reactions of the N-Bn-3-imino-functionalized indolyl ligand 1-Bn-3-(DippN=CH)C₈H₅N with one equivalent of rare-earth metal trialkyl precursors. The structures of compounds 1 and 2 were confirmed by X-ray crystal analyses and characterized by elemental analysis, IR, NMR spectroscopy wherein applicable. In the presence of cocatalysts, these rare-earth metal dialkyl complexes initiated isoprene polymerization with a high activity (95% conversion of 2000 equivalent of isoprene in 360 min), producing polymers with high regioselectivity (1, 4-polymers up to 91%).
- indolyl ligand,
- rare-earth metal dialkyl complex,
- isoprene,
- polymerization
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