Zirconium complexes of phenylene-bridged {ONSO} ligands: Coordination chemistry and stereoselective polymerization of rac -lactide

Ayellet Stopper, Konstantin Press, Jun Okuda, Israel Goldberg, Moshe Kol

Research output: Contribution to journalArticlepeer-review

Abstract

Sequential tetradentate dianionic thio-imine diphenolate ligands featuring an ortho-phenylene core and their zirconium complexes are described for the first time. Ligands that include different combinations of bulky-alkyl groups and halo groups on the two phenol arms were prepared by a substitution/ condensation reaction sequence. An unexpected fac-fac wrapping mode was found in the solid state for the ligands in the octahedral [{ONSO}Zr(O tBu)2] complexes. The complexes were all fluxional, and the barrier for enantiomer interconversion was found to depend on the phenolate substituents. The complexes were found to catalyze the polymerization of rac-lactide to poly(lactic acid) in solution with polymer tacticities varying from heterotactic to atactic which showed correlation to the nature of phenolate substituents but not to the degree of complex fluxionality.

Original languageEnglish
Pages (from-to)9140-9150
Number of pages11
JournalInorganic Chemistry
Volume53
Issue number17
DOIs
StatePublished - 2 Sep 2014

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