Issue 5, 2017

Salan group 13 complexes – structural study and lactide polymerisation


Herein the preparation and characterisation of a series of group 13 salan complexes, with a bipyrrolidine or N,N′-ethylenediamine backbone are disclosed. For the bipyrrolidine derived-salan ligand 1H2, the Al(III) and Ga(III) complexes are pseudo trigonal bipyramidal in the solid-state, whereas the In(III) complexes are best described as square based pyramidal structures. However, for the ethylenediamine derived-salan ligand 2H2, all complexes are effectively square based pyramidal in their structure. The complexes' solution behaviour is also investigated by NMR spectroscopic methods and it is observed that the solid-state structure is maintained in solution. The complexes have all been trialled for the ring opening polymerisation of rac-lactide. With In(1)Cl controlled polymerisation and narrow molecular weight distributions (1.01–1.08) are observed with heterotactic polylactide being prepared. Under the conditions tested the Ga(III) and Al(III) complexes were shown to be inactive.

Graphical abstract: Salan group 13 complexes – structural study and lactide polymerisation

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Article information

Article type
08 Dec 2016
06 Feb 2017
First published
08 Feb 2017
This article is Open Access
Creative Commons BY license

New J. Chem., 2017,41, 2198-2203

Salan group 13 complexes – structural study and lactide polymerisation

J. Beament, M. F. Mahon, A. Buchard and M. D. Jones, New J. Chem., 2017, 41, 2198 DOI: 10.1039/C6NJ03844A

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