Abstract
New (pyrazolyl)-(phosphinoyl)pyridine ligands 2-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-6-((diphenylphosphinoyl)methyl)pyridine (L1b) and 2-((3,5-diphenyl-1H-pyrazol-1-yl)methyl)-6-((diphenylphosphinoyl)methyl)pyridine (L2b) were synthesized in high yields. Reactions of L1b and L2b with Fe(II), Co(II) and Ni(II) salts afforded complexes [NiCl2(L1b)] (1), [NiBr2(L1b)] (2), [CoCl2(L1b)] (3), [FeCl2(L1b)] (4), [NiBr2(L2b)] (5), and [CoCl2(L2b)] (6) in good yields. The compounds were characterized by NMR spectroscopy, mass spectrometry and elemental analyses. Molecular structures of complexes 1, 5 and 6 were confirmed by single crystal X-ray crystallography to contain one tridentate bound NˆNˆO L1b and L2b ligands. Complexes 1–6 formed active catalysts in ethylene oligomerization reactions upon activation with EtAlCl2, methylaluminoxane (MAO) or trimethylaluminium (AlMe3) as co-catalyst to produce C4 as the major product as well as C6 and C8 oligomers. The nature of solvent and co-catalyst, significantly affected both the activities and product compositions of the resultant catalysts.
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