| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1301346 | Inorganic Chemistry Communications | 2015 | 5 Pages |
•Three new dinuclear group 4 metal alkoxides [Ti2(μ-OiPr)(OiPr)4L] (1), [Zr2(μ-OiPr)(OiPr)4L] (2) and [Hf2(μ-OiPr)(OiPr)4L] (3) were successfully obtained. The X-ray structures of complexes 1 and 3 revealed dinuclear species in which each metal center was hexa-coordinated and adopted a distorted octahedral geometry. Complexes 1–3 are excellent catalysts/initiators for ring-opening polymerization of ε-caprolactone and L- and rac-lactide to give the corresponding polyesters. Especially complexes 2 and 3 show very high reactivity in the solvent-free bulk polymerization of rac-LA.
Three new dinuclear group 4 metal alkoxides [Ti2(μ-OiPr)(OiPr)4L] (1), [Zr2(μ-OiPr)(OiPr)4L] (2) and [Hf2(μ-OiPr)(OiPr)4L] (3) have been prepared in good yields from the reaction of N, N-di(salicylidene)-2-hydroxyphenylmethanediamine (L-H3) and two equiv. [M(OiPr)4(HOiPr)n], respectively. Complexes 1–3 have been characterized by 1H NMR, 13C NMR, elemental analyses and X-ray diffraction analyses. The molecular structures of complexes 1 and 3 reveal dinuclear species in which the metal centers are hexa-coordinated to one oxygen atom and one nitrogen atom of the ligand, to two oxygen atoms of two isopropoxy groups, and to two bridging oxygen atoms of one phenolate group of ligand and one isopropoxy group. Complexes 1–3 are excellent catalysts/initiators for ring-opening polymerization of ε-caprolactone and L- and rac-lactide to give the corresponding polyesters.
Graphical abstractThree new dinuclear group 4 metal alkoxides [Ti2(μ-OiPr)(OiPr)4L] (1), [Zr2(μ-OiPr)(OiPr)4L] (2) and [Hf2(μ-OiPr)(OiPr)4L] (3) were successfully obtained. Complexes 1–3 are excellent catalysts/initiators for ring-opening polymerization of ε-caprolactone and L- and rac-lactide to give the corresponding polyesters.Figure optionsDownload full-size imageDownload as PowerPoint slide
