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

So Han Kim; Da Jung Kim; Min Jeong Go; Young Soo Ko; Junseong Lee; Youngjo Kim

doi:10.1039/C2DT31357J

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

So Han Kim,^a Da Jung Kim,^a Min Jeong Go,^b Young Soo Ko,^c Junseong Lee*^b and Youngjo Kim*^a

* Corresponding authors

^a Department of Chemistry, Chungbuk National University, 52 Naesudong-ro, Heungdeok-gu, Cheongju, Chungbuk 361-763, Republic of Korea
E-mail: ykim@chungbuk.ac.kr
Fax: +82 43 267 2279
Tel: +82 43 261 3395

^b Department of Chemistry, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea
E-mail: leespy@chonnam.ac.kr
Fax: +82 62 530 3389
Tel: +82 62 530 3371

^c Department of Chemical Engineering, Kongju National University, Budeadong 275, Cheonan, Chungnam 314-701, Republic of Korea

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 fac–fac geometry for tetradentate L around a Ti centre in both solid and solution, whereas complex 2 has different geometry in solid (mer–fac, C₁) and solution (fac–fac, 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.

Supplementary files

Publication details

The article was received on 17 Apr 2012, accepted on 26 Jul 2012 and first published on 30 Jul 2012

Article type: Paper

DOI: 10.1039/C2DT31357J

Citation: Dalton Trans., 2012,41, 11619-11626

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

Abstract

Supplementary files

Publication details

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

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