文献类型：期刊文献

英文题名：Binuclear aluminum complexes supported by linked bis(β-diketiminate) ligands for ring-opening polymerization of cyclic esters

作者：Gong, Shaogang;Du, Peng;Ma, Haiyan[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Lab Organometall Chem, Shanghai 200237, Peoples R China

年份：2018

卷号：36

期号：2

起止页码：190

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20212810632372);WOS:【SCI-EXPANDED(收录号:WOS:000419342800008)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 20604009 and 21474028).

语种：英文

外文关键词：Bis(beta-diketiminate) ligand; Aluminum complex; Binuclear; Polymerization; Cyclic ester

摘要：Binuclear aluminum alkyl complexes 2a-4g supported by linked bis(beta-diketiminate) ligands were synthesized via the reaction of AlEt3 or AlMe3 and the corresponding proligand in a 2:1 molar ratio with moderate yields. The isolated complexes were well-characterized by H-1-NMR, C-13-NMR and elemental analysis. The binuclear nature of aluminum complex (2b) was further confirmed by an X-ray diffraction study. All complexes 2a-4g could efficiently initiate the ring-opening polymerization (ROP) of epsilon-caprolactone in toluene. The substituents at the aromatic rings and the linker unit in the auxiliary ligands exerted significant influence on the catalytic behavior of the investigated aluminum complexes. Complex 4g (R-1 = R-2 = Cl) containing propylenyl bridging unit exhibited the highest catalytic activity among these complexes, which might be attributed to the increased electrophilicity of the metal center as well as more opened coordination sphere. The molecular weights of obtained poly(epsilon-caprolactone)s deviating considerably from the theoretical values indicated that the ROP of epsilon-caprolactone by complexes 2a-4g was not well-controlled, which was also judged from the broad molecular weight distributions (MWD = 1.47-2.47) of produced poly(epsilon-caprolactone)s. These complexes proved to be inactive toward the polymerization of rac-lactide alone. In the presence of alcohol the polymerization occurred, which was actually initiated by the decomposition species of the aluminum complex upon the treatment with isopropanol.