Synthesis and characterization of nickel(II) complexes bearing 2-(imidazol-2-yl)pyridines or 2-(pyridin-2-yl)phenanthroimidazoles/oxazoles and their polymerization of norbornene |
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| Authors: | Abiodun O Eseola Min Zhang Weiwei Zuo Joseph AO Woods |
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| Institution: | a Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, No. 2, Beiyijie, Zhongguancun, Haidian-Sub., Beijing 100190, China
b Inorganic Chemistry Group, Department of Chemistry, University of Ibadan, Ibadan, Nigeria |
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| Abstract: | Series of 2-R1-6-(1-R2-4,5-diphenyl-1H-imidazol-2-yl)pyridine (R1 = R2 = H, L1; R1 = Me, R2 = H, L2; R1 = H, R2 = Me, L3; R1 = R2 = Me, L4), 2-(6-R1-pyridin-2-yl)-1H-phenanthro9,10-d]imidazole (R1 = H, L5; R1 = Me, L6) and 2-(pyridin-2-yl)phenanthro9,10-d]oxazole (L7) were synthesized and used to prepare their corresponding dihalonickel complexes (C1-C9). All organic compounds and nickel complexes were characterized by elemental and spectroscopic analyses. Molecular structures of C1, C4, C5 and C8 were confirmed by the single-crystal X-ray diffraction analysis. The single-crystal X-ray analysis revealed complex C1 as a distorted octahedral geometry, complex C4 as a distorted square pyramidal geometry, complex C5 as a distorted trigonal bipyramidal configuration, and complex C8 as a tetrahedral geometry. Upon activation with methylaluminoxane (MAO), the nickel complexes showed good activity towards norbornene polymerization through main additional and minor ring-opening metathesis. The reaction parameters such as norbornene concentration, reaction temperature and different coordinate environments caused by the ligands affected their catalytic performances. |
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| Keywords: | Nickel Catalyst Molecular structure Vinyl polymerization Norbornene |
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