Synthesis and characterisation of aluminium(III) imine bis(phenolate) complexes with application for the polymerisation of rac-LA

Thomas R. Forder; Matthew D. Jones

doi:10.1039/c4nj02228a

Synthesis and characterisation of aluminium(III) imine bis(phenolate) complexes with application for the polymerisation of rac-LA

Thomas R. Forder, Matthew D. Jones

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Abstract

A series of tridentate imine bis(phenolate) ligands have been synthesised and complexed to aluminium. Solid-state analysis identified two structural motifs of an aluminium dimer [Al₂(Me)₂(X)₂]; one consisting of two five-coordinate aluminium centres and a second containing aluminium centres in both a six- and four-coordinate geometry. Pairing with solution-state NMR spectroscopic analysis suggested that the geometry isolated was influenced by the ligands' steric bulk. Trialling of Al₂(Me)₂(1-5)₂ as initiators for the ring-opening polymerisation (ROP) of rac-lactide found them all to be active, producing atactic polymeric material. Al₂(Me)₂(1)₂ was found to have good molecular weight control and activity an order of magnitude higher than analogous aluminium dimers.

Original language	English
Pages (from-to)	1974-1978
Number of pages	5
Journal	New Journal of Chemistry
Volume	39
Issue number	3
DOIs	https://doi.org/10.1039/c4nj02228a
Publication status	Published - 1 Mar 2015

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10.1039/c4nj02228a

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title = "Synthesis and characterisation of aluminium(III) imine bis(phenolate) complexes with application for the polymerisation of rac-LA",

abstract = "A series of tridentate imine bis(phenolate) ligands have been synthesised and complexed to aluminium. Solid-state analysis identified two structural motifs of an aluminium dimer [Al2(Me)2(X)2]; one consisting of two five-coordinate aluminium centres and a second containing aluminium centres in both a six- and four-coordinate geometry. Pairing with solution-state NMR spectroscopic analysis suggested that the geometry isolated was influenced by the ligands' steric bulk. Trialling of Al2(Me)2(1-5)2 as initiators for the ring-opening polymerisation (ROP) of rac-lactide found them all to be active, producing atactic polymeric material. Al2(Me)2(1)2 was found to have good molecular weight control and activity an order of magnitude higher than analogous aluminium dimers.",

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N2 - A series of tridentate imine bis(phenolate) ligands have been synthesised and complexed to aluminium. Solid-state analysis identified two structural motifs of an aluminium dimer [Al2(Me)2(X)2]; one consisting of two five-coordinate aluminium centres and a second containing aluminium centres in both a six- and four-coordinate geometry. Pairing with solution-state NMR spectroscopic analysis suggested that the geometry isolated was influenced by the ligands' steric bulk. Trialling of Al2(Me)2(1-5)2 as initiators for the ring-opening polymerisation (ROP) of rac-lactide found them all to be active, producing atactic polymeric material. Al2(Me)2(1)2 was found to have good molecular weight control and activity an order of magnitude higher than analogous aluminium dimers.

AB - A series of tridentate imine bis(phenolate) ligands have been synthesised and complexed to aluminium. Solid-state analysis identified two structural motifs of an aluminium dimer [Al2(Me)2(X)2]; one consisting of two five-coordinate aluminium centres and a second containing aluminium centres in both a six- and four-coordinate geometry. Pairing with solution-state NMR spectroscopic analysis suggested that the geometry isolated was influenced by the ligands' steric bulk. Trialling of Al2(Me)2(1-5)2 as initiators for the ring-opening polymerisation (ROP) of rac-lactide found them all to be active, producing atactic polymeric material. Al2(Me)2(1)2 was found to have good molecular weight control and activity an order of magnitude higher than analogous aluminium dimers.

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Synthesis and characterisation of aluminium(III) imine bis(phenolate) complexes with application for the polymerisation of rac-LA

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Synthesis and characterisation of aluminium(III) imine bis(phenolate) complexes with application for the polymerisation of rac-LA

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