Self-assembled heterogeneous late transition-metal catalysts for ethylene polymerization; New approach to simple preparation of iron and nickel complexes immobilized in clay mineral interlayer

摘要

To develop heterogeneous catalysts for ethylene polymerization, bis(imino)pyridineiron(III), α-diiminenickel(II), and iminopyridinenickel(II) complexes were immobilized in the clay mineral (montmorillonite, fluorotetrasilicic mica or saponite) interlayers by a one-pot preparation method. In this method, the Fe~(3+)- and Ni~(2+)-exchanged clay minerals as an acid catalyst promoted the ligand formation from a ketone derivative and an aniline derivative, and then the formed ligand simultaneously coordinated to the metal ions located in the clay mineral interlayer. The obtained heterogeneous catalysts showed 100-3,000 g-PE g-cat~(-1) h~(-1) as activities for the ethylene polymerization/ oligomerization.