Tianpengfei Xiao

Synthesis, characterization and ethylene oligomerization behaviour of 8-(1-aryliminoethylidene)quinaldinylnickel dihalides

A series of 8-(1-aryliminoethylidene)quinaldines and the nickel halides thereof were synthesized and characterized, and the molecular structures of two representative nickel complexes were confirmed by single-crystal X-ray diffraction studies. Upon treatment with diethylaluminium chloride (Et2AlCl), the nickel pro-catalysts exhibited high activity for ethylene oligomerization (1.24–1.83 × 106 g mol−1(Ni) h−1) with good thermal stability at 60 °C under 10 atm of ethylene. The influence of the reaction parameters on the catalytic behaviour was investigated for these nickel-based systems, including variation of Al/Ni molar ratio and reaction temperature. Furthermore, the effect of the ancillary ligand Ph3P was also probed.

2-(1-Aryliminopropylidene)quinolylcobalt(II) dichlorides: synthesis, characterization and catalytic behaviour towards ethylene

A series of 2-(1-aryliminopropylidene)quinolines and their cobalt(II) chlorides were synthesized and characterized. Activation with methylaluminoxane (MAO) under 10 atm ethylene pressure, all the cobalt procatalysts exhibited good activities for ethylene dimerization at room temperature, however, performed ethylene polymerization at elevated reaction temperatures. Sole ethylene polymerization was achieved at 10 atm ethylene at 90 °C. The polyethylenes obtained indicated that the molecular weight ranged from 92.5 Kg mol−1 to 176.9 Kg mol−1 with narrower molecular weight distributions (2.82–4.17).