Titanium complexes with novel triaryl-substituted phosphinimide ligands: Synthesis, structure and ethylene polymerization behavior |
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| Authors: | Changhe Qi Suobo Zhang |
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| Institution: | a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
b Graduate School of the Chinese Academy of Sciences, China |
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| Abstract: | A series of titanium phosphinimide complexes Ph2P(2-RO-C6H4)]2TiCl2 (7, R = CH3; 8, R = CHMe2) and PhP(2-Me2CHO-C6H4)]THF]TiCl3 (9) have been prepared by reaction of TiCl4 with the corresponding phosphinimines under dehalosilylation. The structure of complex 9 has been determined by X-ray crystallography, and a solvent molecule THF was found to be coordinated with the central metal and the Ti-O bond was consistent with the normal Ti-O (donor) bond length. The complexes 7 and 8 displayed inactive to ethylene polymerization, and the complex 9 displayed moderate activity in the presence of modified methylaluminoxane (MMAO) or i-Bu3Al/Ph3CB(C6F5)4, and this should be partly attributed to coordination of THF with titanium and the steric effect of two iso-propoxyl. And catalytic activity up to 32.2 kg-PE/(mol-Ti h bar) was observed. |
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| Keywords: | Complex Titanium Phosphinimine Ethylene polymerization |
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