1015800-70-0Relevant articles and documents
High-temperature catalysts for the production of a-olefins based on iron(II) and cobalt(II) tridentate bis(imino)pyridine complexes with a double pattern of substitution: O-methyl plus o-fluorine in the same imino arm
Ionkin, Alex S.,Marshall, William J.,Adelman, Douglas J.,Fones, Barbara Bobik,Fish, Brian M.,Schiffhauer, Matthew F.,Spence, Rupert E.,Xie, Tuyu
, p. 1147 - 1156 (2008)
The new series of bis(imino)pyridine ligands [2-F-6-MePhN=C(Me)PyC(Me)=NPh- 2-F-6-Me] (14), [2-F-6-MePhN=C(Me)PyC(Me)=NPh-2-Me] (19), and [2-F-6-MePhN=C(Me)PyC(Me)=N-Ph-2,4-Me2] (20) and their corresponding Fe(II) complexes [{2-F-6-Me-PhN=C(Me)PyC(Me)=NPh-2-F-6-Me}FeCl2] (4), [{2-F-6-MePhN=C(Me)PyC(Me)=NPh-2-Me}FeCl2] (5), and {[2-F-6-MePhN=C(Me)PyC(Me)=NPh-2,4-Me2]FeCl2} (6) and Co(II) complex [{2-F-6-MePhN=C(Me)PyC(Me)=NPh-2-Me}CoI2] (7) with a double pattern of substitution, o-methyl plus o-fluorine in the same imino arm, were synthesized and fully characterized. According to X-ray analysis 4, 5, and 7 exist mostly in the unexpected up-up conformers in the solid state. The Co-N bonds in 7 are shorter than the corresponding Fe-N bonds in the analogous complex 5 by 0.003-0.025 A. This shortening of metal-N bonds going from iron(II) to cobalt(II) complexes can be explained by the smaller van der Waals radius of Co vs. that of Fe. The Fe complexes 4-6 afforded very productive catalysts for the production of α-olefins with a more linear Schultz-Flory distribution of a-olefins and with higher K values than the parent methyl-substituted Fe(II) complex [{2-MePhN=C(Me)PyC(Me)=NPh-2-Me}FeCl 2] (1). The cobalt complex 7 was found to have very low activity in α-olefin oligomerization experiments within the tested range of temperatures (60-130°C).
