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New insights into the lactide polymerisation with neutral N-donor stabilised zinc complexes: Comparison of imidazolin-2-imine vs. guanidine complexes


Reference:

Borner, J., Florke, U., Gloge, T., Bannenberg, T., Tamm, M., Jones, M. D., Doring, A., Kuckling, D. and Herres-Pawlis, S., 2010. New insights into the lactide polymerisation with neutral N-donor stabilised zinc complexes: Comparison of imidazolin-2-imine vs. guanidine complexes. Journal of Molecular Catalysis A: Chemical, 316 (1-2), pp. 139-145.

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Official URL:

http://dx.doi.org/10.1016/j.molcata.2009.10.012

Abstract

Two imidazolin-2-imine zinc complexes [Zn(8MeBL)Cl-2] (1) and [Zn(8MeBL)(OAc)(2)] (2) were synthesised, completely characterised and investigated for their activity in the solvent-free ring-opening polymerisation of D,L-lactide. It could be shown that these compounds are able to act as efficient initiators for lactide polymerisation,and polylactides with molecular weights (M-w) of around 23,000-55,000 g/mol could be obtained with relatively narrow polydispersities. 1 and 2 exhibit an advantageous combination of robustness towards humidity and high activity in the polymer melt. A comparative DFT study on 1 and 2 and their guanidine counterparts revealed that the two complex series possess a strikingly similar electronic structure. Although the imidazolin-2-imine is more basic, its zinc complexes have only a slightly greater positive charge on the zinc atom in comparison to the corresponding guanidine complexes. Accordingly, their activity in the initiation of the ring-opening polymerisation is increased which is directly related to the Lewis acidity of the zinc atom. These findings allow more insights into the mechanism of the lactide polymerisation with neutral N-donor stabilised zinc complexes. (C) 2009 Elsevier B.V. All rights reserved.

Details

Item Type Articles
CreatorsBorner, J., Florke, U., Gloge, T., Bannenberg, T., Tamm, M., Jones, M. D., Doring, A., Kuckling, D. and Herres-Pawlis, S.
DOI10.1016/j.molcata.2009.10.012
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code17828

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