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Issue 28, 2009
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Synthesis and structure of aluminium amine-phenolate complexes

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Reaction of Al(OiPr)3 with the tris-phenol amine ligand L1H3 in toluene at ambient temperature results in the formation of the iso-propanol adduct [HOiPr·Al(L1)]. Single crystal X-ray diffraction analysis reveals the structure to be a hydrogen bonded dimer. Reaction of Al(OiPr)3 (or AlMe3) with L1H3 in THF affords the related, and structurally characterised THF adduct, [THF·Al(L1)]. Similar reaction of Al(OiPr)3 (or AlMe3) with the bis-phenol amine and tetra-phenol diamine ligands, L2H3 and L3H4, results in the formation and isolation of the complexes [Al(L2)]2 and [Al(L3)H] respectively, both of which have been structurally characterised viasingle crystal X-ray diffraction studies. Reaction of the alkoxide bridged dimer [Al(L2)]2 with the strong Lewis base HMPA results in the formation of the monomeric HMPA adduct [HMPA·Al(L2)] which was also structurally characterised. The adduct [HOiPr·Al(L1)] and the dimer [Al(L2)]2 were tested for their activity in the ring-opening polymerisation (ROP) of rac-lactide under solvent-free conditions (130 °C). Under the conditions employed [Al(L2)]2 failed to produce polymer after 48 h, in stark contrast to [HOiPr·Al(L1)] which after 24 h and 48 h produced narrow molecular weight polymer (24 h: yield = 25%, Mn = 14500 and PDI = 1.05; 48 h: yield = 65%, Mn = 47700 and PDI = 1.06).

Graphical abstract: Synthesis and structure of aluminium amine-phenolate complexes

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The article was received on 05 Mar 2009, accepted on 21 May 2009 and first published on 08 Jun 2009

Article type: Paper
DOI: 10.1039/B904534A
Citation: Dalton Trans., 2009,0, 5551-5558
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    Synthesis and structure of aluminium amine-phenolate complexes

    A. L. Johnson, M. G. Davidson, Y. Pérez, M. D. Jones, N. Merle, P. R. Raithby and S. P. Richards, Dalton Trans., 2009, 0, 5551
    DOI: 10.1039/B904534A

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