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

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

doi:10.1039/D3RA06529D

Artikel / Aufsatz Do., 12. Okt.. 2023 CC BY 3.0

Veröffentlicht

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

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

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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Einordnung

Datum der Veröffentlichung:

12.10.2023

URN:

urn:nbn:de:hbz:465-20240402-133859-8

DOI:

10.1039/D3RA06529D

Sprache:

Englisch

Ressourcentyp:

Text

Kollektion:

E-Publikationen

Sachgruppen der Deutschen Nationalbibliographie:

540 Chemie

Einrichtung:

Fakultät für Chemie

Einrichtung:

Forschungszentren, Center for Nanointegration Duisburg-Essen (CENIDE)

Förderung:

The publication of this article was supported by the Publication Fund of the University of Duisburg-Essen.

S. S. acknowledges financial support from the Deutsche Forschungsgemeinschaft (DFG, INST 20876/282-1 FUGG) and the University of Duisburg-Essen. D. C. and A. H. G. are also grateful for financial support from Evonik Industries and from the DFG through the Emmy Noether Programm (No. 376920678).

Informationen zur Erstveröffentlichung:

Glöckler, E., Kapp, L., Wölper, C., Schumacher, M., Gröschel, A., & Schulz, Homoleptic and heteroleptic ketodiiminate zinc complexes for the ROP of cyclic l-lactide. RSC Adv., 2023, 13, 29879 https://doi.org/10.1039/D3RA06529D

First published 12 Oct 2023

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