Jump to main content
Jump to site search


Aluminium complexes containing salicylbenzothiazole ligands and their application in the ring-opening polymerisation of rac-lactide and ε-caprolactone

Author affiliations

Abstract

Two series of aluminium complexes bearing salicylbenzothiazole ligands, namely four-coordinate aluminium complexes (1a–7a) and five-coordinate aluminium complexes (1b–7b), were synthesized and characterized by NMR spectroscopy, elemental analysis and X-ray diffraction crystallography (for 5a and 1b). Their application in the ring-opening polymerisation of rac-lactide and ε-caprolactone was studied with the aim of drawing comparisons to closely related aluminium salicylbenzoxazole complexes investigated previously. In the presence of benzyl alcohol, all complexes were active initiators and polymerisations were all well controlled and living. Kinetic studies revealed first-order kinetics in the monomer. In contrast, the catalytic activity of aluminium salicylbenzothiazole complexes was lower than that of aluminium salicylbenzoxazole counterparts. Detailed DFT calculations were performed and indicated that the observed lower catalytic activity of aluminium salicylbenzothiazole complexes agreed well with the observed higher Gibbs free energy at the ring-opening transition state.

Graphical abstract: Aluminium complexes containing salicylbenzothiazole ligands and their application in the ring-opening polymerisation of rac-lactide and ε-caprolactone

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Jul 2017, accepted on 19 Jul 2017 and first published on 20 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT02435E
Citation: Dalton Trans., 2017, Advance Article
  •   Request permissions

    Aluminium complexes containing salicylbenzothiazole ligands and their application in the ring-opening polymerisation of rac-lactide and ε-caprolactone

    C. Nakonkhet, T. Nanok, W. Wattanathana, P. Chuawong and P. Hormnirun, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02435E

Search articles by author

Spotlight

Advertisements