title: Activation of a bis(phenoxy-amine) precatalyst for olefin polymerisation: first evidence for an outer sphere ion pair with the methylborate counterion.
abstract: A bis(phenoxy-amine)ZrMe(2) complex (1) was synthesized and activated with B(C(6)F(5))(3) obtaining an ion pair (2) having the MeB(C(6)F(5))(3)(-) counterion in the second coordination sphere as deduced by NMR studies. Both DFT calculations and NMR investigations suggest that the activation is coupled with a change of the binding modality of the tetradentate ligand from cis(N,N)-trans(O,O) in the octahedral dimethyl precursor to 1 cis(N, N)-cis(O,O) in the ion pair 2.
authors.affiliation: Dipartimento di Chimica, Università di Perugia, Via Elce di Sotto, 8-06123, Perugia, Italy.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Ciancaleoni
authors.forename: Natascia
authors.initials: N
authors.lastname: Fraldi
authors.forename: Peter H M
authors.initials: PH
authors.lastname: Budzelaar
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Busico
authors.forename: Alceo
authors.initials: A
authors.lastname: Macchioni