Synthesis, Characterization, Crystal Structures of Bis(imino)pyridyl Nickel Complexes and Their Catalytic Performance for Ethylene Polymerization

Abstract

Abstract: Reactions of equimolar ratios of NiCl₂·6H₂O to the tridentate ligands 2,6-bis[1-(2-methyl-phenylimino)ethyl]pyridine(L¹) or 2,6-bis[(1-phenylimino)ethyl]pyridine(L²) in acetonitrile afford the five-coordinated complexes NiCl₂L¹·CH₃CN(1) and [NiCl₂L²·CH₃CN](2), respectively. All ligands and complexes were characterized by using elemental analysis, IR and ¹H NMR spectroscopy. The structures of complexes 1 and 2 were determined by single-crystal X-ray diffraction. Crystallographic studies on complexes 1 and 2 reveal both complexes to be pentacoordinated with geometries that can be best described as distorted trigonal bipyramidal. Complex 1 crystallizes in the monoclinic system, space group C_c, with a=2.578 3(5) nm, b=1.484 3(3) nm, c=1.586 6(3) nm; β=122.82(3)°, V=5.102 4(18) nm³, Z=4, R₁=0.070 8. Complex 2 belongs to monoclinic system with space group C_c, a=1.577 2(1) nm, b=0.859 4(1) nm, c=1.545 9(1) nm; β=103.27(1)°, (V=2.039 4(2) nm³,) Z=4, R₁=0.037 5. Complexes 1 and 2 exhibit lower catalytic activities for ethylene polymerization upon activation with MAO.

Key words: Bis(imino)pyridyl nickel complexes, Crystal structure, Ethylene polymerization

CLC Number:

O614

TrendMD:

FAN Rui-Qing, ZHU Dong-Sheng, MU Ying, LI Guang-Hua, FENG Shou-Hua. Synthesis, Characterization, Crystal Structures of Bis(imino)pyridyl Nickel Complexes and Their Catalytic Performance for Ethylene Polymerization[J]. Chem. J. Chinese Universities, 2005, 26(7): 1215.

References

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