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

Title data

Herber, Ulrich ; Hegner, Katharina ; Wolters, Daniel ; Siris, Rita ; Wrobel, Karina ; Hoffmann, Alexander ; Lochenie, Charles ; Weber, Birgit ; Kuckling, Dirk ; Herres-Pawlis, Sonja:
Iron(II) and Zinc(II) Complexes with Tetradentate Bis(pyrazolyl)methane Ligands as Catalysts for the Ring-Opening Polymerisation of rac -Lactide.
In: European Journal of Inorganic Chemistry. Vol. 2017 (2017) Issue 10 . - pp. 1341-1354.
ISSN 1099-0682
DOI: https://doi.org/10.1002/ejic.201601345

Abstract in another language

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)2Bipy, L1] and bis(3,5-methylpyrazolyl)bipyridinylmethane [HC(3,5-MePz)2Bipy, L2]. From these ligands, a large variety of new mononuclear FeII and ZnII complexes with counterions ranging from halides to carboxylates and sulfate were synthesised and characterised by X-ray crystallography. The complexes [Fe{HC(Pz)2Bipy}X2] (X = Cl–, CF3CO2–, CF3SO3–), [Fe{HC(3,5-MePz)2Bipy}X2] (X = Cl–, CF3CO2–) and [Zn{HC(Pz)2Bipy}X2] (X = Cl–, CF3CO2–) were tested in the melt ring-opening polymerisation of sublimed and unsublimed technical-grade rac-lactide at 150 °C. The complex [Fe{HC(Pz)2Bipy}(CF3CO2)2] showed the most promising results and produced a conversion of 87 % after 30 h with molecular weights of Mw ≈ 30000 g mol–1.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry IV > Chair Anorganic Chemistry IV - Univ.-Prof. Dr. Birgit Weber
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry IV
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 25 Jul 2017 10:56
Last Modified: 25 Jul 2017 10:56
URI: https://eref.uni-bayreuth.de/id/eprint/38797