https://scholars.lib.ntu.edu.tw/handle/123456789/623923
標題: | Zinc complexes coordinated by bipyridine-phenolate ligands as an efficient initiator for ring-opening polymerization of cyclic esters | 作者: | Hsieh Y.-L. Lin Y.-C. Lee G.-H. CHI-HOW PENG |
關鍵字: | Bipyridine-phenolate;Ring-opening polymerization;Zinc complexes | 公開日期: | 2015 | 卷: | 56 | 起(迄)頁: | 237-244 | 來源出版物: | Polymer | 摘要: | A series of zinc complexes coordinated by different bipyridine-phenolate (BpyPh) ligands, 2-([2,2′-bipyridin]-6-yl)-4,6-di-tert-butylphenol (BpyPh2,4-tBu-H, 3) and 2-([2,2′-bipyridin]-6-yl)-4-(tert-butyl) phenol (BpyPh4-tBu-H, 4) have been synthesized. The reaction of BpyPh2,4-tBu-H with ZnEt2 gave a six-coordinated complex of [(BpyPh2,4-tBu)2Zn] (5) with the distorted octahedral geometry. However, the dinuclear complexes of [(BpyPh)Zn(μ-OBn)]2 (6 and 7) were formed when benzyl alcohol was added and then can be converted to mononuclear zinc benzylalkoxide species by the increased temperature. The ε-CL and L-LA polymerizations initiated by complex 6 showed the living characteristics of narrow molecular weight distribution (PDIs < 1.15) and the capability of block copolymer synthesis demonstrated by the formation of PCL-b-PVL and PCL-b-PHB. The ring-opening polymerizations of cyclic esters initiated by complex 5, however, was not effective possibly due to the highly steric hindered metal center. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921313561&doi=10.1016%2fj.polymer.2014.12.001&partnerID=40&md5=264b130134e65456d4174564e06847c1 https://scholars.lib.ntu.edu.tw/handle/123456789/623923 |
DOI: | 10.1016/j.polymer.2014.12.001 | SDG/關鍵字: | Block copolymers;Esters;Ligands;Molecular weight distribution;Synthesis (chemical);Zinc compounds;Bipyridines;Block copolymer synthesis;Coordinated complexes;Dinuclear complex;Increased temperature;Narrow molecular weight distributions;Octahedral geometry;Zinc complex;Ring opening polymerization |
顯示於: | 化學系 |
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