Synthesis and Characterization of a Cationic Cyclopentadienyl Nickel(II) Complex of Bis(mesityl-imino)acenaphthene and its Evaluation as a New Catalyst Precursor for Ethylene Polymerization

Synthesis of Cationic, Dimeric α-Diimine Nickel Hydride Complexes and Relevance to the Polymerization of Olefins

“…To investigate the electronic structure of the cations further, a comparable Ni­(I) species bearing the same ligand scaffold was of interest. To that end, a diimine nickel cyclopentadienyl complex was also prepared, as cationic species of this type have been reported previously . The synthesis of [( i Pr DI)­Ni­(Cp)] ( 5 ) was accomplished by treatment of a THF solution of [( i Pr DI)­Ni­(μ 2 -Br)] 2 with 2 equiv of sodium cyclopentadienide (NaCp) at ambient temperature and stirring for 24 h (Scheme ).…”

“…To that end, a diimine nickel cyclopentadienyl complex was also prepared, as cationic species of this type have been reported previously. 19 The synthesis of [( iPr DI)Ni(Cp)] ( 5) was accomplished by treatment of a THF solution of [( iPr DI)Ni(μ 2 -Br)] 2 20 with 2 equiv of sodium cyclopentadienide (NaCp) at ambient temperature and stirring for 24 h (Scheme 4). Complex 5 was isolated as a bright purple paramagnetic solid in 88% yield.…”