Stereo-regulated methyl methacrylate (MMA) polymerization catalyzed by asymmetric Salen-type Schiff-base Cu(II) complexes |
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| Affiliation: | 1. School of Chemical Engineering, Shaanxi Key Laboratory of Degradable Medical Material, Northwest University, Xi''an 710069, Shaanxi, China;2. School of Chemistry & Chemical Engineering, Xi''an Shiyou University, Xi''an 710065, Shaanxi, China;1. Kanazawa Institute of Technology, Yatsukaho, Hakusan, Ishikawa 924-0838, Japan;2. Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan;3. Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8603, Japan;4. Osaka City University, Sugimoto, Sumiyoshi, Osaka 558-8585, Japan |
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| Abstract: | A series of mononuclear asymmetric Salen-type Schiff-base complexes [Cu(Ln)] (n = 1–5, 1–5) were obtained by the Cu(II)-templated approach in the presence of one of five salicylaldehyde derivatives, respectively. These complexes could effectively catalyze the metal-coordinative polymerization of MMA for the formation of the syndio-enriched PMMAs (poly(methyl methacrylates)) in the presence of AIBN, where the Cu(II)-to-chelate-plane distances are positively relative to the catalytic activity. Moreover, the introduction of the encumbering substituent ortho to the phenoxide ring of the ligands plays a much more important and influential role on the tacticity and chain-growth of the obtained PMMAs than the variation of reaction conditions under the controllable polymerization. |
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