A bis(phenoxy-amine)ZrMe2 complex (1) was synthesized and activated with B(C6F5)3 obtaining an ion pair (2) having the MeB(C6F5)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 1 to cis(N, N)-cis(O,O) in the ion pair 2. © 2009 The Royal Society of Chemistry.
Activation of a bis(phenoxy-amine) precatalyst for olefin polymerisation: First evidence for an outer sphere ion pair with the methylborate counterion
CIANCALEONI, GIANLUCA;
2009-01-01
Abstract
A bis(phenoxy-amine)ZrMe2 complex (1) was synthesized and activated with B(C6F5)3 obtaining an ion pair (2) having the MeB(C6F5)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 1 to cis(N, N)-cis(O,O) in the ion pair 2. © 2009 The Royal Society of Chemistry.File in questo prodotto:
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