Mg and Al Complexes Containing a New Tridentate Amidinate Ligands: Highly Efficient Initiators for the Ring-opening Polymerization of ε-Caprolactone
Polyesters constitute a branch of renewable and biodegradable plastics that are currently receiving significant attention both in industry and academia.1,2 Recently, a series metal complexes containing bidentate, tetradendate, NNO-tridentate and NNN-tridentate have been reported towards ROP of cyclic esters.Among them, the latter NNN-tridentate has demonstrated an interesting feature in which the arm of the quinolinyl group can coordinate with the rare-earth metal to increase the sterics and coordination sites of the ligand, creating a single active site nature to initiate the polymerization of ε-caprolactone (ε-CL).3,4 Therefore, we have synthesized a series of tridentate amidine ligands Ar-N=C(Ph)-N(H)-Qu (Qu =8-quinolyl)(Ar=2,6-di(Me)Ph (L1), 2,6-di(Et)Ph (L2), 2,6-di(i-Pr)Ph (L3), 2,4,6-tri(Me)Ph(L4), 2,6-di(Et)-4-(Me)Ph (L5).Reactions of these ligands with C2H5MgBr afforded the bimetallic magnesium bromide complexes (C1-C5), while the treatment of these ligands with AlMe3 in toluene gave the product of dimethylaluminum complexes (C6-C10).All of Mg and Al complexes were fully characterized by 1 H/13C NMR spectroscopy and elemental analysis.Solid state structures of complexes C2, C5 and C6 were determined by single crystal X-ray diffraction technique.Both aluminum complexes and magnism complexes could show good activity for ring opening polymerization of caprolactone with or without BnOH as coinitiator.
Yanxia Xi Natesan Mannangatti Rajendran Wenjuan Zhang Ming Lei Wen-Hua Sun
College of Science, Beijing University of Chemical Technology, Beijing 100190, China;Key Laboratory College of Science, Beijing University of Chemical Technology, Beijing 100190, China Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences,Beijing
国际会议
9th International Symposium on High-Tech Polymer Materials(第9届国际高技术高分子材料学术会议)(HTPM-9)
郑州
英文
105-105
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）