Homoleptic and heteroleptic ketodiiminate zinc complexes for the ROP of cyclic L-lactide

Eduard Glöckler; Leon Kapp; Christoph Wölper; Marcel Schumacher; André H. Gröschel; Stephan Schulz

doi:10.1039/D3RA06529D

Homoleptic and heteroleptic ketodiiminate zinc complexes for the ROP of cyclic l-lactide†

Eduard Glöckler,^a Leon Kapp,^a Christoph Wölper,^a Marcel Schumacher,

^b André H. Gröschel

^b and Stephan Schulz

*^ac

Author affiliations

* Corresponding authors

^a Faculty of Chemistry, University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
E-mail: stephan.schulz@uni-due.de

^b Faculty of Chemistry, University of Münster and Center for Soft Nanoscience (SoN), Busso-Peus-Strasse 10, 48149 Münster, Germany

^c Center for Nanointegration Duisburg-Essen (CENIDE), Carl-Benz-Straße 199, 47057 Duisburg, Germany

Abstract

Homo- and heteroleptic ketodiiminate zinc complexes L¹₂Zn₂ (1, L¹ = [Me₂NC₂H₄NC(Me)CH]₂CO), L²(ZnCp)₂ (2, L² = [Me₂NC₃H₆NC(Me)CH]₂CO, Cp = C₅H₅) and L²HZnCp* (3, Cp* = C₅Me₅) were synthesized and characterized by ¹H and ¹³C NMR and IR spectroscopy as well as by elemental analysis and single crystal X-ray diffraction (sc-XRD, 2, 3). The catalytical activity of heteroleptic complexes 2 and 3 were tested in the ring-opening polymerization (ROP) of L-lactide. Homobimetallic complex 2 showed the highest activity and selectivity for the synthesis of cyclic polylactide (cPLLA; TOF = 17 460 h⁻¹) at 100 °C in toluene solution, while linear polymers are formed with mononuclear complex 3.

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DOI: https://doi.org/10.1039/D3RA06529D
Article type: Paper
Submitted: 25 Sep 2023
Accepted: 04 Oct 2023
First published: 12 Oct 2023
This article is Open Access

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RSC Adv., 2023,13, 29879-29885

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Homoleptic and heteroleptic ketodiiminate zinc complexes for the ROP of cyclic L-lactide

E. Glöckler, L. Kapp, C. Wölper, M. Schumacher, A. H. Gröschel and S. Schulz, RSC Adv., 2023, 13, 29879 DOI: 10.1039/D3RA06529D

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Homoleptic and heteroleptic ketodiiminate zinc complexes for the ROP of cyclic l-lactide†

Abstract

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Homoleptic and heteroleptic ketodiiminate zinc complexes for the ROP of cyclic L-lactide

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