Iminopyridine-Based CobaltII and NickelII Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene PolymerizationReport as inadecuate




Iminopyridine-Based CobaltII and NickelII Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization - Download this document for free, or read online. Document in PDF available to download.

Key Laboratory of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China



These authors contributed equally to this work.





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Academic Editor: Changle Chen

Abstract A series of iminopyridine ligated CoII 1a–7a and NiII 1b–7b complexes were synthesized. The structures of complexes 3a, 4a, 5a, 7a, 5b, and 6b were determined by X-ray crystallographic analyses. Complex 3a formed a chloro-bridged dimer, whereas 4a, 5a, and 7a, having a substituent 4a, 5a: CH3; 7a: Br at the 6-position of pyridine, producing the solid structures with a single ligand coordinated to the central metal. The nickel atom in complex 5b features distorted trigonal-bipyramidal geometry with one THF molecule ligating to the metal center. All the complexes activated by ethylaluminum sesquichloride EASC were evaluated in 1,3-butadiene polymerization. The catalytic activity and selectivity were significantly influenced by the ligand structure and central metal. Comparing with the nickel complexes, the cobalt complexes exhibited higher catalytic activity and cis-1,4-selectivity. For both the cobalt and nickel complexes, the aldimine-based complexes showed higher catalyst activity than their ketimine counterparts. View Full-Text

Keywords: iminopyridine; cobalt; nickel; 1,3-butadiene; polybutadiene iminopyridine; cobalt; nickel; 1,3-butadiene; polybutadiene





Author: Quanquan Dai †, Xiangyu Jia †, Feng Yang, Chenxi Bai * , Yanming Hu * and Xuequan Zhang

Source: http://mdpi.com/



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