Abstract
Cobalt and nickel complexes (1a-1d and 2a-2d, respectively) supported by 2-imidate-pyridine ligands were synthesized and used for 1,3-butadiene polymerization. The complexes were characterized by IR and element analysis, and complex 1a was further characterized by single-crystal X-ray diffraction. The solid state structure of complex 1a displayed a distorted tetrahedral geometry. Upon activation with ethylaluminum sesquichloride (EASC), all the complexes showed high activities toward 1,3-butadiene polymerization. The cobalt complexes produced polymers with high cis-1,4 contents and high molecular weights, while the nickel complexes displayed low cis-1,4 selectivity and the resulting polymers had low molecular weights. The catalytic activities of the complexes highly depended on the ligand structure. With the increment of polymerization temperature, the cis-1,4 content and the molecular weight of the resulting polymer decreased.
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This work was financially supported by the 973 Program (No. 2015CB654700 or 2015654702), the National Natural Science Foundation of China (Nos. 51473156 and 51203147).
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Liu, H., Yang, Sz., Wang, F. et al. Polymerization of 1,3-butadiene catalyzed by cobalt(II) and nickel(II) complexes bearing pyridine-2-imidate ligands. Chin J Polym Sci 34, 1060–1069 (2016). https://doi.org/10.1007/s10118-016-1825-1
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DOI: https://doi.org/10.1007/s10118-016-1825-1