Group 2 Metal Complexes Based on Redox-Active Acenaphthene-1,2-Diimine Ligand for the Polymerization of L-Lactide

Abstract

Magnesium and calcium coordination compounds (dpp-bian)Ca(thf)₄ (1), (dpp-bian)₂Mg (2), and (dpp-bian)₂Ca (3), containing a chelating redox-active acenaphthenediimine ligand, dpp-bian {1,2-bis-[(2,6-diisopropyl)phenylimino]acenaphthene}, were studied as L-lactide ring-opening polymerization catalysts. The interaction of complex 1 with L-lactide in solution was studied by ESR spectroscopy. The solvent effect on the polymerization rate and molecular-mass characteristics of the polymers obtained was demonstrated.