Rare-earth Metal Dialkyl Complexes Supported by 1,3-Disubstituted Indolyl Ligand: Synthesis,Characterization and Catalytic Activity for Isoprene Polymerization |
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| Institution: | Anhui Provincial Engineering Laboratory of Silicon-based Materials,Bengbu University,Bengbu 233030,China;The Key Laboratory of Functional Molecular Solids,Ministry of Education,Anhui Normal University,Wuhu 241000,China;Anhui Provincial Engineering Laboratory of Silicon-based Materials,Bengbu University,Bengbu 233030,China |
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| Abstract: | Rare-earth metal dialkyl complexes 1-Bn-3-(DippN=CH)C_8H_4N]RE(CH_2SiMe_3)_2(thf)_2(Dipp =2,6-~iPr_2C_6H_3, 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)C_8H_5N 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%). |
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