An alkyl-ended ansa-bis(amidine) and solvent-influenced complexation modes of its group IV metal derivatives

Diverse complexation modes could be observed in group IV complexes supported by tBu-ended ansa-bis(amidine) SiMe2[N(H)C(Ph)N(tBu)]2. Two different forms were crystallized from dichloromethane and toluene, respectively. The transformation was driven by the different polarity of the solvents. With methylaluminoxane, some complexes were active in catalyzing ethylene polymerization.