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• W2029383772 endingPage "1590" @default.
• W2029383772 startingPage "1584" @default.
• W2029383772 abstract "A series of 2,6-bis(imino)pyridyl Co(II) complexes of the general formulas [2,6-(ArNCMe)2C5H3N]CoCl2 (Ar = –C6H5, 3a; 2-MeC6H4, 3b; 2-EtC6H4, 3c; 2-iPrC6H4, 3d; 2,6-iPr2C6H3, 3e; 4-iPrC6H4, 3f; 4-FC6H4, 3g; 4-CF3C6H4, 3h; 2-FC6H4, 3i; 2,6-F2C6H3, 3j; 2-Me-4-FC6H3, 3k and 2,6-Me2-4-FC6H2, 3l) and [2,6-(ArNCH)2C5H3N]CoCl2 (Ar = –C6H5, 3m; 2-EtC6H4, 3n and 4-iPrC6H4, 3o) have been synthesized and characterized. The structures of new complexes 3a, 3f–3h and 3m–3o are further confirmed by X-ray crystallography. All complexes adopt distorted trigonal bipyramidal configuration with the equatorial plane formed by the pyridyl nitrogen atoms and the two chlorine atoms. In the complexes 3m and 3o, three aromatic rings are essentially coplanar, which is in sharp contrast to the other complexes, where three rings are almost orthogonal to each other. With methylaluminoxane (MAO) as cocatalyst in toluene at room temperature, the complexes show moderate to high conversion (42–99%) in butadiene polymerization, producing polybutadiene with tunable cis-1,4 structure (77.5–97%) and controllable molecular weight and molecular weight distribution. The catalytic activity, selectivity as well as the molecular weight and molecular weight distribution of the resultant polymer are found to be dependent on the size and nature of substituents on iminoaryl rings and their positions located. By deliberately tuning the ligand structure, more efficient catalyst in terms of high activity and high selectivity can be obtained." @default.
• W2029383772 created "2016-06-24" @default.
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• W2029383772 date "2011-04-01" @default.
• W2029383772 modified "2023-10-14" @default.
• W2029383772 title "Synthesis, characterization and butadiene polymerization studies of cobalt(II) complexes bearing bisiminopyridine ligand" @default.
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• W2029383772 doi "https://doi.org/10.1016/j.jorganchem.2011.01.015" @default.
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