Synthesis, characterization and catalytic behavior toward ethylene of cobalt(II) and iron(II) complexes bearing 2-(1-aryliminoethylidene)quinolines
摘要:
A series of 2-(1-aryliminoethylidene)quinolines (L) were synthesized and used as bidentate N boolean AND N ligands in coordinating with metal (cobalt and iron) chlorides to form complexes of the type LMCl(2), cobalt(II) (Co1-Co5) and iron(II) (Fe1-Fe5). All organic compounds and metal complexes were fully characterized, and the molecular structures of the representative complexes Co3 center dot DMF and Fe4 center dot DMF were confirmed as distorted bipyramidal geometry at the metal by single-crystal X-ray diffraction. Upon activation with either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO) under 10 atm ethylene, all complexes showed high activities in ethylene dimerization with activities of up to 1.82 x 10(6) g mol(-1) (Co) h(-1) and 5.89 x 10(5) g mol(-1) (Fe) h(-1), respectively. (C) 2011 Elsevier B. V. All rights reserved.