Ring-opening polymerization of rac-lactide catalyzed by Al(III) and Zn(II) complexes incorporating Schiff base ligands derived from pyrrole-2-carboxaldehyde

被引：13

作者：

Rufino-Felipe, Ernesto ^{[1
]}

Lopez, Nazario ^{[1
]}

Vengoechea-Gomez, Fabio A. ^{[1
]}

Guerrero-Ramirez, Luis-Guillermo ^{[2
]}

Munoz-Hernandez, Miguel-Angel ^{[1
]}

机构：

[1] Univ Autonoma Estado Morelos, IICBA, Ctr Invest Quim, Av Univ 1001, Cuernavaca 62209, Morelos, Mexico

[2] Univ Guadalajara, Dept Quim, Ctr Univ Ciencias Exactas & Ingn, Blvd Marcelino Garcia Barragan 1421, Guadalajara 44430, Jalisco, Mexico

来源：

APPLIED ORGANOMETALLIC CHEMISTRY | 2018年 / 32卷 / 06期

关键词：

Al and Zn complexes; bis(pyrrolidene) Schiff base ligands; polylactide; rac-lactide; ring-opening polymerization; RACEMIC LACTIDE; COORDINATION CHEMISTRY; ALUMINUM COMPLEXES; POLY(LACTIC ACID); MOLECULAR-WEIGHT; CYCLIC ESTERS; STEREOSELECTIVITY; INITIATOR; MECHANISM; ALKOXIDES;

D O I：

10.1002/aoc.4315

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A series of Al(III) chloride [LAl-Cl]; Al(III) alkoxide [LAl-OR](2); and Zn(II) [LZn](2) complexes with Schiff base ligands were obtained. H-1 NMR and X-ray diffraction studies indicate that [LAl-Cl] complexes have C-s symmetry and the Al center is penta-coordinated. The Al(III) alkoxide complex [(LAl)-Al-5-(OPr)-Pr-i](2) is a dimer bridged by (OPr-)-Pr-i with the Al center in a distorted octahedral environment. Zn complexes [LZn](2) are double helix dimers with tetra-coordinated Zn centers. The catalytic activity for the ring-opening polymerization of rac-lactide was evaluated. The best activity in this series is shown by the aluminium chloride complex with a flexible three-carbon bridge; more flexible four-carbon bridges lower the activity.

引用

页数：9

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