Two series of ligands based on diaminocyclohexane (DACH) have been prepared and successfully complexed to Al(III) and Zn(II) metal centres. Solution and solid-state studies reveal a tendency to form mono- or bis-ligated forms depending on the steric bulk of the ligand. These complexes have been tested for their ability to ring open rac-lactide. Al(III) based complexes generally gave atactic PLA after a polymerization time of 1-2 days. The Zn(II) complexes, were found to be more active and furnished PLA with a slight heterotactic bias.
Kirk, S., McKeown, P., Mahon, M., Kociok-Kohn, G., Woodman, T., & Jones, M. (2017). Synthesis of Zn(II) and Al(III) complexes of diaminocyclohexane derived ligands and their exploitation for the ring opening polymerization of rac-lactide. European Journal of Inorganic Chemistry, 2017(45), 5417-5426. https://doi.org/10.1002/ejic.201701186