Coordination complexes for producing polycarbonate by copolymerization of carbon dioxide and epoxide using the same as catalyst

摘要

Provided are a complex prepared from ammonium salt-containing ligands and having such an equilibrium structural formula that the metal center takes a negative charge of 2 or higher, and a method for preparing polycarbonate via copolymerization of an epoxide compound and carbon dioxide using the complex as a catalyst. When the complex is used as a catalyst for copolymerizing an epoxide compound and carbon dioxide, it shows high activity and high selectivity and provides high-molecular weight polycarbonate, and thus easily applicable to commercial processes. In addition, after forming polycarbonate via carbon dioxide/epoxide copolymerization using the complex as a catalyst, the catalyst may be separately recovered from the copolymer.

主权项

1. A complex represented by Chemical Formula 12: wherein p and q independently represent an integer from 1 to 19; R26 represents primary or secondary (C1-C20)alkyl; R27 through R29 are independently selected from (C1-C20)alkyl and (C6-C30)aryl; Q represents (C6-C30)arylene, (C1-C20)alkylene or (C3-C20)cycloalkylene, wherein the arylene, alkylene or cycloalkylene is optimally further substituted by a substituent selected from halogen atoms, (C1-C7)alkyl and nitro groups; and Z1 through Z5 are independently selected from a halide ion; BF4−; ClO4−; NO3−; PF6−; HCO3−; and a (C6-C30)aryloxy anion; (C1-C20)carboxylic acid anion; (C1-C20)alkoxy anion; (C1-C20)alkylcarbonate anion; (C1-C20)alkylsulfonate anion; (C1-C20)alkylamide anion; or (C1-C20)alkylcarbamate anion with or without at least one of halogen, nitrogen, oxygen, silicon, sulfur and phosphorus atoms, wherein a part of Z1 through Z4 coordinated at the cobalt atom is optionally de-coordinated.