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New heteroscorpionate lanthanide complexes for ring-opening polymerisation of ε-caprolactone and rac-lactide

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Abstract

Yttrium and lanthanum amido-complexes with bis(pyrazol-1-yl)acetates in their coordination spheres were studied as the catalysts in ε-caprolactone and lactide ring-opening polymerisation. A high molecular mass poly(ε-caprolactone) (PCL) was obtained in almost quantitative yield under mild conditions. rac-Lactide polymerisations were less efficient and required quite harsh experimental conditions to obtain atactic PLA samples with moderate yields. The average chain-length of PCL was dependent upon the choice of the metal centre and the presence of substituents on the pyrazole rings of the ancillary ligand. The ground-state geometries of the complexes and the first stages of ε-caprolactone polymerisation were computationally modelled by means of DFT calculations.

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Authors and Affiliations

  1. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Dorsoduro 2137, 30123, Venezia, Italy

    Alberto Scrivanti, Marco Bortoluzzi & Mattia Gatto

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  1. Alberto Scrivanti
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  2. Marco Bortoluzzi
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  3. Mattia Gatto
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Correspondence to Alberto Scrivanti.

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Scrivanti, A., Bortoluzzi, M. & Gatto, M. New heteroscorpionate lanthanide complexes for ring-opening polymerisation of ε-caprolactone and rac-lactide. Chem. Pap. 70, 53–60 (2016). https://doi.org/10.1515/chempap-2015-0144

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