Synthesis and structure of aluminium amine-phenolate complexes
Johnson, A. L., Davidson, M. G., Pérez, Y., Jones, M. D., Merle, N., Raithby, P. R. and Richards, S. P., 2009. Synthesis and structure of aluminium amine-phenolate complexes. Dalton Transactions, 2009 (28), pp. 5551-5558.
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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 via single 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).
|Creators||Johnson, A. L., Davidson, M. G., Pérez, Y., Jones, M. D., Merle, N., Raithby, P. R. and Richards, S. P.|
|Departments||Faculty of Science > Chemistry|
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