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Alternating Copolymerization of Carbon Dioxide and Propylene Oxide Catalyzed by Cobalt Schiff Base Complex
Author(s) -
Niu Yongsheng,
Li Hongchun,
Chen Xuesi,
Zhang Wanxi,
Zhuang Xiuli,
Jing Xiabin
Publication year - 2009
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900093
Subject(s) - propylene carbonate , cobalt , propylene oxide , triclinic crystal system , schiff base , copolymer , chemistry , polymer chemistry , ligand (biochemistry) , octahedron , catalysis , carbonate , pyridine , inorganic chemistry , crystal structure , organic chemistry , ethylene oxide , polymer , biochemistry , receptor , electrode , electrochemistry
Cobalt 2,4‐dinitrophenolate (complex 1 ) based upon a N , N , O , O ‐tetradentate Schiff base ligand framework was prepared. X‐ray diffraction analysis confirmed that complex 1 was triclinic species with a six‐coordinated central cobalt octahedron in the solid. Asymmetric alternating copolymerization of carbon dioxide (CO 2 ) with racemic propylene oxide ( rac ‐PO) proceeded effectively by complex 1 in conjunction with (4‐dimethylamino)pyridine (DMAP), yielding a perfectly alternating and bimodal molecular weight distribution PO/CO 2 poly(propylene carbonate) (PPC) with a small amount of cyclic carbonate byproducts.