Research

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


Reference:

Hancock, S. L., Mahon, M. F. and Jones, M. D., 2011. Crystallographic characterisation of Ti(IV) piperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide. Dalton Transactions, 40 (9), pp. 2033-2037.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

http://dx.doi.org/10.1039/c0dt01542c

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 via NMR spectroscopy. In the solid-state either Ti-2(L)((OPr)-Pr-i)(6) or Ti-2(L)(2)(OiPr)(4) were observed depending upon the nature of the starting ligand. For complexes with less sterically demanding ligands (1H(2) and 2H(2)) an equilibrium was observed: 2 Ti-2(L)((OPr)-Pr-i)(6) double left right arrow Ti-2(L)(2)((OPr)-Pr-i)(4) + 2 Ti((OPr)-Pr-i)(4). The thermodynamic properties (Delta G, Delta H and Delta S) have been investigated via variable temperature NMR spectroscopy. With more sterically demanding ligands (3-8H(2)) the Ti-2(L)((OPr)-Pr-i)(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.

Details

Item Type Articles
CreatorsHancock, S. L., Mahon, M. F. and Jones, M. D.
DOI10.1039/c0dt01542c
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code23007

Export

Actions (login required)

View Item