Titanium complexes containing bidentate benzotriazole ligands as catalysts for the ring opening polymerization of lactide

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The selective syntheses of titanium complexes containing the 2-(2H-benzo[d][1,2,3]triazol-2-yl)-4,6-ditert-pentylphenol (LH) ligand, namely [LTiCl2(mu-Cl)](2) (1), LTiCl3(THF) (2), L2Ti(NMe2)2 (3), L2TiCl2 (4) and L2Ti(O-i-Pr)2 (5), were achieved by changing the solvents or metal precursors. The solid state structures of 1-5 were revealed by single-crystal X-ray analyses. Complexes 2 and 5 showed a fast thermal exchange process of the benzotriazole ligand L. Among 1-5, complex 5 was proven as a highly effective catalyst for the controlled ring opening polymerization (ROP) of lactide (LA), as shown by the linearity of the molecular weight versus [LafTij ratio as well as very narrow PDI values of the PLA polymers obtained.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2014-01
Language
English
Article Type
Article
Keywords

CHELATING DIARYLOXO LIGANDS; GROUP-4 METAL-COMPLEXES; RAC-LACTIDE; CYCLIC ESTERS; EPSILON-CAPROLACTONE; EFFICIENT CATALYSTS; ZINC-COMPLEXES; STRUCTURAL-CHARACTERIZATION; ZIRCONIUM COMPLEXES; ALUMINUM COMPLEXES

Citation

POLYHEDRON, v.67, pp.286 - 294

ISSN
0277-5387
DOI
10.1016/j.poly.2013.09.017
URI
http://hdl.handle.net/10203/188764
Appears in Collection
RIMS Journal Papers
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