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

doi:10.1007/s11705-010-0546-1

Front Chem Sci Eng

2011, Vol. 5

Issue (1) : 19-25 https://doi.org/10.1007/s11705-010-0546-1

RESEARCH ARTICLE

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

Jihong LU¹, Danfeng ZHANG¹(

), Qian CHEN², Buwei YU²

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

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Abstract

Two types of salicylaldiminato-based nickel complexes, mono-ligated Ni(II) complexes ([O-C₆H₄-o- C(H)=N-Ar]Ni(PPh₃)(Ph) (5), [O-(3,5-Br₂)C₆H₂-o-C(H)=N-Ar]Ni(PPh₃)(Ph) (6), [O-(3-t-Bu)C₆H₃-o-C(H)=N-Ar]Ni(PPh₃)(Ph) (7)) and bis-ligated Ni(II) complexes ([O-(3,5-Br₂)C₆H₂-o-C(H)=N-Ar]₂Ni (8), [O-(3,5-Br₂)C₆H₂-o-C(H)=N-2-C₆H₄(PhO)]₂Ni (9), Ar=2,6-C₆H₃(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.

Keywords late transition metal catalyst methyl methacrylate polymerization salicylaldiminato nickel complexes methylaluminoxane syndiotactic structure

Corresponding Author(s): ZHANG Danfeng,Email:zdf93102@ecust.edu.cn

Issue Date: 05 March 2011

Cite this article:

Jihong LU,Danfeng ZHANG,Qian CHEN, et al. Polymerization of methyl methacrylate catalyzed by mono-/bis-salicylaldiminato nickel(II) complexes and methylaluminoxane[J]. Front Chem Sci Eng, 2011, 5(1): 19-25.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0546-1
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I1/19

Fig.1 Synthesis of ligands - and complexes -

Tab.1 The influence of MAO/complex ratio

Tab.2 The influence of the monomer concentration by complex

Tab.3 The influence of polymerization temperature by complex

Tab.4 The influence of polymerization time by complex

Tab.5 The influence of solvents by complex

Tab.6 The influence of the complex structures

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