Ruthenium(IV) Complexes for Ethylene Insertion Polymerization
摘要:
The synthesis, characterization, and ethylene polymerization behavior of novel Ru-IV(eta(3):eta(3)-C10H16)(OPO) (OPO = bis(arenesulfonato)phosphine) complexes is reported here. Upon activation with AlMe3-depleted methylaluminoxane (dMAO), the Ru(IV) precursors were able to produce polyethylene with activities up to 1182 h(-1) turnover frequency (TOF). The polymers were highly linear with a low degree of branching (<12 methyl branches per 1000 C) and had high molecular weights (up to M-p = 289 kg mol(-1)) with a bimodal molecular weight distribution. The polymerization activity increased with decreasing donor strength of the OPO ligand.