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Issue 35, 2016
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Monomeric and dimeric Al(iii) complexes for the production of polylactide

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A series of monometallic and bimetallic Al(III) complexes with substituted naphthyl based Schiff base ligands have been prepared and characterised. When 1-aminonaphthalene based ligands were reacted with AlMe3 monometallic complexes were isolated, however, with 1,5 and 1,8-diaminonaphthalene based ligands bimetallic complexes were formed. In all cases 4-coordinate tetrahedral Al(III) centres were observed in the solid state and in solution. There was little difference in rate of polymerisation of rac-lactide between the monometallic and bimetallic complexes based on 1,5-diaminonaphthalene. However, for the 1,8-diaminonaphthalene the complex was an order of magnitude faster than the monometallic and the analogous 1,5-system. Moreover, this complex was active at room temperature, which is rare for aluminium initiators, and PLA with a high degree (Pm = 0.82) of isotacticity was observed.

Graphical abstract: Monomeric and dimeric Al(iii) complexes for the production of polylactide

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Article information

19 Jul 2016
03 Aug 2016
First published
04 Aug 2016

Dalton Trans., 2016,45, 13846-13852
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Monomeric and dimeric Al(III) complexes for the production of polylactide

S. M. Kirk, H. C. Quilter, A. Buchard, L. H. Thomas, G. Kociok-Kohn and M. D. Jones, Dalton Trans., 2016, 45, 13846
DOI: 10.1039/C6DT02861F

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