Polymerization of methyl methacrylate catalyzed by mono-/bis-salicylaldiminato nickel(Ⅱ) complexes and methylaluminoxane  

作　　者：Jihong LU Danfeng ZHANG Qian CHEN Buwei YU 

机构地区：[1]School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Daqing Petrochemical Research Center of CNPC,Daqing 163714,China

出　　处：《Frontiers of Chemical Science and Engineering》2011年第1期19-25,共7页化学科学与工程前沿（英文版）

基　　金：sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry of China,the Science and Technology Innovation Program of the China National Petroleum Corporation,and the Key Laboratory of Advanced Polymer Materials of Shanghai(Grant No.08DZ2230500);the Science and Technology Innovation Program of China National Petroleum Corporation.

摘　　要：Two types of salicylaldiminato-based nickel complexes,mono-ligated Ni(II)complexes([O-C_(6)H_(4)-o-C(H)=N-Ar]Ni(PPh_(3))(Ph)(5),[O-(3,5-Br_(2))C_(6)H_(2)-o-C(H)=N-Ar]Ni(PPh_(3))(Ph)(6),[O-(3-t-Bu)C_(6)H_(3)-o-C(H)=N-Ar]Ni(PPh_(3))(Ph)(7))and bis-ligated Ni(II)complexes([O-(3,5-Br_(2))C_(6)H_(2)-o-C(H)=N-Ar]_(2)Ni(8),[O-(3,5-Br_(2))C_(6)H_(2)-o-C(H)=N-2-C_(6)H_(4)(PhO)]_(2)Ni(9),Ar=2,6-C_(6)H_(3)(i-Pr)_(2))were synthesized and characterized by Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance(NMR),mass spectrography(MS)and elemental analysis(EA).In the presence of methylaluminoxane(MAO)as cocatalyst,all the nickel complexes exhibited high activities for the polymerization of methyl methacrylate(MMA)and syndiotactic-rich poly(methyl methacrylate)(PMMA)was obtained.The complexes with less bulky substituents on salicylaldiminato framework possessed higher activities,while with the same salicylaldiminato,the mono-ligated nickel complexes showed higher catalytic activity than bis-ligated ones.

关 键 词：late transition metal catalyst methyl methacrylate POLYMERIZATION salicylaldiminato nickel complexes METHYLALUMINOXANE syndiotactic structure 

分 类 号：O62[理学—有机化学]