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Issue 9, 2011
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Crystallographic characterisation of Ti(IV) piperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide

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Abstract

In this paper a series of eight Ti(IV) piperazine based complexes have been prepared and fully characterised in the solid-state by X-ray crystallography and in solution viaNMR spectroscopy. In the solid-state either Ti2(L)(OiPr)6 or Ti2(L)2(OiPr)4 were observed depending upon the nature of the starting ligand. For complexes with less sterically demanding ligands (1H2 and 2H2) an equilibrium was observed: 2 Ti2(L)(OiPr)6 ⇔ Ti2(L)2(OiPr)4 + 2 Ti(OiPr)4. The thermodynamic properties (ΔG, ΔH and ΔS) have been investigated viavariable temperature NMR spectroscopy. With more sterically demanding ligands (3–8H2) the Ti2(L)(OiPr)6 form was the most prevalent in the solid-state and in solution. These complexes have been tested for the production of polylactide under melt and solution conditions with high conversions being obtained.

Graphical abstract: Crystallographic characterisation of Ti(iv) piperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide

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Publication details

The article was received on 05 Nov 2010, accepted on 21 Dec 2010 and first published on 19 Jan 2011


Article type: Paper
DOI: 10.1039/C0DT01542C
Citation: Dalton Trans., 2011,40, 2033-2037
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    Crystallographic characterisation of Ti(IV) piperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide

    S. L. Hancock, M. F. Mahon and M. D. Jones, Dalton Trans., 2011, 40, 2033
    DOI: 10.1039/C0DT01542C

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