Synthesis, characterization and ethylene oligomerization studies of nickel complexes bearing 2-imino-1,10-phenanthrolines
摘要:
A series of nickel (11) complexes ligated by 2-imino-1,10-phenanthrolines were synthesized and characterized by elemental and spectroscopic analysis as well as by single-crystal X-ray crystallography. X-ray crystallographic analysis reveals complexes 3, 5, 7 and 11 as the five-coordinated distorted trigonal-bipyramidal geometry. Upon activation with Et(2)AlCl, these complexes exhibited considerably high activity for ethylene oligomerization (up to 3.76 x 10(7) g mol(-1) (Ni) h(-1) for 12 with 10 equiv. of PPh(3)). The ligand environment and reaction conditions significantly affect the catalytic activity of their nickel complexes. (c) 2006 Elsevier B.V. All rights reserved.