Zinc and aluminum complexes derived from 2, 4-N, N′-disubstituted 1, 3, 5-triazapentadienyl ligands: Synthesis, characterization and catalysis of the ring-opening polymerization of rac-lactide

Abstract

Bis(1,3,5-triazapentadienate)zinc complexes [N(Ph)C(R)NC(R)N(SiMe3)]2Zn (R=NMe2, 1; 1-piperidino, 2) and (1,3,5-triazapentadienate)aluminum dichloride [N(Ph)C(NMe2)NC(NMe2)N(SiMe3)]AlCl2·C9H18N6 (3) were synthesized and structurally characterized by X-ray crystallography and spectroscopic techniques. The X-ray structures of 1–3 showed that they crystallize in the triclinic system and prefer coordination to the zinc and aluminum centers via the terminal N atoms of the NCNCN ligand backbone, affording tetrahedral geometry. The catalytic properties of 1 and 2 were evaluated.