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Abstract
We communicate here the unusual structural and cocatalytic features of a new, stable (perfluoroaryl)aluminate anion, tris(2,2`,2``-nonafluorobiphenyl)flouroaluminate (PBA{sup -}). Noteworthy features include very large ion pairing/metallocenium ancillary ligand structural effects on olefin polymerization activity and stereoselectivity. These results considerably expand what is known about the consequences of strong cation-anion interactions for group 4-mediated olefin polymerization. For anions that coordinatively `intrude` into the cation coordination sphere, the effects can be dramatic. 15 refs., 1 tab.
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