Issue 41, 2009

Novel Ti(iv) and Zr(iv) complexes and their application in the ring-opening polymerisation of cyclic esters

Abstract

A series of group 4 amine tris(phenolate) complexes have been prepared and characterised by single crystal X-ray diffraction and multinuclear NMR spectroscopy. It was found that the ligands afforded monomeric titanium complexes and dimeric zirconium structures in the solid-state. The complexes have been tested for the ring-opening polymerisation of rac-lactide under both solution and melt conditions, which showed varying degrees of selectivity and control, with PDIs in the range of 1.09–2.07. The initiators were also tested for the production of copolymers containing rac-lactide and isosorbide. From NMR spectroscopic analysis and MALDI-TOF mass spectrometry the isosorbide is incorporated into the polymer. The complexes were also screened for the ring-opening polymerisation of 1,3-dioxan-2-one to produce a polycarbonate with good conversions (24–99%).

Graphical abstract: Novel Ti(iv) and Zr(iv) complexes and their application in the ring-opening polymerisation of cyclic esters

Supplementary files

Article information

Article type
Paper
Submitted
15 Jun 2009
Accepted
20 Jul 2009
First published
11 Aug 2009

Dalton Trans., 2009, 9020-9025

Novel Ti(IV) and Zr(IV) complexes and their application in the ring-opening polymerisation of cyclic esters

E. L. Whitelaw, M. D. Jones, M. F. Mahon and G. Kociok-Kohn, Dalton Trans., 2009, 9020 DOI: 10.1039/B911545E

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