Issue 38, 2012

Synthesis, X-ray structures, and controlled ring opening polymerization behavior of l-lactide using titanium complexes chelated by tetradentate diamine–diethanolate ligand

Abstract

The synthesis and characterization of LTi(O-i-Pr)2 (1) and LTiCl2 (2) complexes containing a new [ONNO]-type tetradentate diamine–diethanolate ligand such as (HOCMe2CH2NMeCH2CH2NMeCH2CMe2OH) (LH22) was achieved. Single-crystal X-ray analyses revealed that monomeric complexes 1 and 2 had pseudo-C2 and pseudo-C1 symmetric distorted octahedral geometry, respectively. Interestingly, complex 1 has facfac geometry for tetradentate L around a Ti centre in both solid and solution, whereas complex 2 has different geometry in solid (merfac, C1) and solution (facfac, C2). They are effective catalysts for the controlled ring opening polymerization of L-lactide, as shown by the linearity of the number average of the molecular weight of polylactides versus conversion, as well as narrow PDI values.

Graphical abstract: Synthesis, X-ray structures, and controlled ring opening polymerization behavior of l-lactide using titanium complexes chelated by tetradentate diamine–diethanolate ligand

Supplementary files

Article information

Article type
Paper
Submitted
17 Apr 2012
Accepted
26 Jul 2012
First published
30 Jul 2012

Dalton Trans., 2012,41, 11619-11626

Synthesis, X-ray structures, and controlled ring opening polymerization behavior of L-lactide using titanium complexes chelated by tetradentate diamine–diethanolate ligand

S. H. Kim, D. J. Kim, M. Jeong Go, Y. Soo Ko, J. Lee and Y. Kim, Dalton Trans., 2012, 41, 11619 DOI: 10.1039/C2DT31357J

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