title: Nuclearity and cooperativity effects in binuclear catalysts and cocatalysts for olefin polymerization.
abstract: A series of bimetallic organo-group 4 "constrained geometry" catalysts and binuclear bisborane and bisborate cocatalysts have been synthesized to probe catalyst center-catalyst center cooperativity effects on olefin enchainment in homogenous olefin polymerization and copolymerization processes. Significant nuclearity effects are found versus mononuclear controls, and the effect can be correlated with metal-metal approach distances and ion pairing effects. Novel polymer structures can be obtained by using such binuclear catalyst/cocatalyst systems.
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208-3113, USA.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Li
authors.forename: Tobin J
authors.initials: TJ
authors.lastname: Marks