Cited by 41biodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysisOrganometallic Complex Synthesis and Catalysis

Iron(II) and Zinc(II) Complexes with Tetradentate Bis(pyrazolyl)methane Ligands as Catalysts for the Ring‐Opening Polymerisation of rac‐Lactide

Herber, Ulrich, Hegner, Katharina, Wolters, Daniel, Siris, Rita, Wrobel, Karina, Hoffmann, Alexander, Lochenie, Charles, Weber, Birgit +2 more·2017·European Journal of Inorganic Chemistry

Abstract

A new subgroup of bis(pyrazolyl)methane ligands has been developed through the synthesis of the first N,N,N,N‐tetradentate bis(pyrazolyl)methane compounds, namely, bis(pyrazolyl)bipyridinylmethane [HC(Pz)2 Bipy, L1] and bis(3,5‐methylpyrazolyl)bipyridinylmethane [HC(3,5‐MePz)2 Bipy, L2]. From these ligands, a large variety of new mononuclear Fe II and Zn II complexes with counterions ranging from halides to carboxylates and sulfate were synthesised and characterised by X‐ray crystallography. The complexes [Fe{HC(Pz)2 Bipy}X 2] (X = Cl–, CF 3 CO 2–, CF 3 SO 3–), [Fe{HC(3,5‐MePz)2 Bipy}X 2] (X = Cl–, CF 3 CO 2–) and [Zn{HC(Pz)2 Bipy}X 2] (X = Cl–, CF 3 CO 2–) were tested in the melt ring‐opening polymerisation of sublimed and unsublimed technical‐grade rac‐lactide at 150 °C. The complex [Fe{HC(Pz)2 Bipy}(CF 3 CO 2)2] showed the most promising results and produced a conversion of 87 % after 30 h with molecular weights of Mw ≈ 30000 g mol–1.

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Crossref · 10.1002/ejic.201601345

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Authors
Herber, U., Hegner, K., Wolters, D., Siris, R., Wrobel, K., Hoffmann, A., Lochenie, C., Weber, B., Kuckling, D., & Herres‐Pawlis, S.
Affiliations
  • RWTH Aachen University (DE)
  • Ludwig-Maximilians-Universität München (DE)
  • University of Bayreuth (DE)
  • Paderborn University (DE)
Corresponding author
Herres‐Pawlis, Sonja
Venue
European Journal of Inorganic Chemistry
Publisher
Wiley
Published
2017-03-10
Volume
2017
Issue
10
Pages
1341-1354
ISSN
  • 1099-0682 (ISSN-L)
  • 1434-1948
OpenAlex
W2565129593
Cited by
41
References
81
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 5 · 2021: 6 · 2020: 6 · 2019: 7 · 2018: 3 · 2017: 3
FWCI
1.77
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Inorganic Chemistry (publishedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Funders
Deutsche Forschungsgemeinschaft (SeleCa)
Topics
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Chemical Engineering › Process Chemistry and Technology › Carbon dioxide utilization in catalysis
  • Physical Sciences › Chemistry › Organic Chemistry › Organometallic Complex Synthesis and Catalysis
Keywords
iron(II) complexes, zinc(II) complexes, bis(pyrazolyl)methane ligands, tetradentate ligands, ring-opening polymerization, rac-lactide, polylactic acid, triflate counterion

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