Nickel(II) and copper(II) complexes as catalysts for norbornene vinyl polymerization bearing tetradentate 尾-ketoiminato ligands
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- 作者：Yinghua Yu ; Jianxin Chen ; Suqin Meng ; Chao Li ; Meiying Lan ; Zhichun Zhang
- 关键词：尾-Ketoiminato ; Nickel ; Copper ; Norbornene ; Vinyl polymerization
- 刊名：Journal of Molecular Catalysis A: Chemical
- 出版年：December, 2013
- 年：2013
- 卷：380
- 期：Complete
- 页码：104-111
- 全文大小：2143 K
文摘
The series of nickel(II) and copper(II) complexes (3a-f) bearing tetradentate [ONNO] 尾-ketoiminato ligands, N,N鈥?bis(2-benzoyl-3-oxobutylidene)-o-phenylenediamine 2a, N,N鈥?bis(2-benzoyl-3-oxobutylidene)-ethylenediamine 2b, N,N鈥?bis(2-benzoyl-3-oxobutylidene)-trans-1,2-cyclohexanediamine 2c, have been synthesized and characterized. X-ray crystal structures of complexes 3a-c and 3e-f reveal that each central metal adopts an almost square planar coordination geometry. Upon activation with methylaluminoxane (MAO), the nickel(II) complexes 3a-c display high catalytic activities for the vinyl polymerization of norbornene (NB), yielding high molecular weights of the polynorbornene (PNB), especially the complex 3b (24.46 脳 105 gPNB/molNi h). While copper(II) complexes 3d-f only traces of PNB are generated. The catalytic system 3b/MAO is chosen for further investigations under various polymerization parameters.