1. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;2. Department of Chemistry, Islamic Azad University of Sarvestan, Sarvestan, Iran
Abstract:
The syntheses, structures and olefin polymerization behavior of Ti complexes containing a pair of chelating aminotropone O? N] ligands are reported. DFT studies revealed that bis(aminotropone) Ti complexes, when activated, provide a metal alkyl in the cis position to a vacant coordination site for monomer binding, suggesting great potential for the polymerization of olefinic monomers. Unlike Ti‐FI catalysts, bis(aminotropone) Ti complexes do not require the presence of steric bulk in close proximity to the anionic donor. Bis(aminotropone) Ti complexes combined with MAO display high ethylene polymerization activities (max. 27 200 kg polymer per mol catalyst and hour) comparable to those obtained with early group‐four metallocene catalysts under identical conditions.
