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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2009, 8824 - 8827, DOI: 10.1039/b908805a

Activation of a bis(phenoxy-amine) precatalyst for olefin polymerisation: first evidence for an outer sphere ion pair with the methylborate counterion

Gianluca Ciancaleoni, Natascia Fraldi, Peter H. M. Budzelaar, Vincenzo Busico and Alceo Macchioni

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.

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