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Iron(II) and cobalt(II) complexes bearing 8-(1-aryliminoethylidene) quinaldines: Synthesis, characterization and ethylene dimerization behavior |
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| Authors: | Shengju Song Carl Redshaw Xiang Hao Wen-Hua Sun |
| Institution: | a Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China b School of Chemistry, University of East Anglia, Norwich NR4 7TJ, UK c State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
| Abstract: | The series of bidentate N^N iron(II) and cobalt(II) complexes containing 8-(1-aryliminoethylidene) quinaldine derived ligands, 8-2,6-(R1)2-4-R2-C6H2N C (Me)]-2-Me-C10H5N, were synthesized and characterized by elemental and spectroscopic techniques. The molecular structures of Co1 (R1 = Me, R2 = H), Co3 (R1 = iPr, R2 = H) and Co4 (R1 = R2 = Me) were confirmed as the distorted tetrahedral by single crystal X-ray diffraction. On treatment with modified methylaluminoxane (MMAO), these complexes exhibited good catalytic activities of up to 5.71 × 105 g mol−1(Fe) h−1 for the ethylene dimerization at 30 °C under 10 atm of ethylene, in which iron pre-catalysts produced butenes with a high selectivity for α-butene. The correlation between metal complexes, catalytic activities and the product formed were investigated under various reaction parameters. |
| Keywords: | 8-(1-Aryliminoethylidene)quinaldine Iron(II) complexes Cobalt(II) complexes Ethylene dimerization |
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