Syntheses and structures of titanium complexes having O,N,O-tridentate ligands and their catalytic ability for ethylene polymerization

O,N,O-tridentate ligands 2-H2 based on a 2,6-substituted pyridine structure and their dichlorotitanium complexes 3 were synthesized and structurally characterized. The complexes have five-coordinated, trigonal bipyramidal structure, in which one chlorine atom was located at trans-position to the nitrogen atom of the pyridine ring and the other was at cis-position. NMR spectroscopy indicated their fluxional structure in solution. The complexes showed low to modest catalytic activity for ethylene polymerization in the presence of methylaluminoxane (MAO) as a co-catalyst.

Dichlorotitanium complexes 3 that have O,N,O-tridentate ligands based on a 2,6-substituted pyridine were synthesized and structurally characterized. The complexes have five-coordinated, trigonal bipyramidal structure. The complexes showed modest catalytic activity for ethylene polymerization in the presence of methylaluminoxane.Figure optionsDownload as PowerPoint slideHighlights
► Titanium complexes that have O,N,O-tridentate ligands were synthesized.
► The ligands are based on a 2,6-substituted pyridine structure.
► The complexes showed trigonal bipyramidal structure.
► The complexes showed catalytic activity for ethylene polymerization with MAO.