Authors
Stefan Weber, Berthold Stöger, Maren Podewitz
Published in
Inorganic chemistry. Volume 65. Issue 35. Pages 20171-20175. Sep 07, 2026.
Abstract
Seesaw ligands enforce a coordination geometry of the two coligands being in a cis configuration in an octahedral environment. While nitrogen-based weak field seesaw ligands are often employed, strong field ligands with mixed nitrogen and phosphine donors are rarely encountered. Herein we report the synthesis of iron(II) dihalide complexes 1 supported by a rigid seesaw PNPN ligand, yielding C2v-symmetric compounds. Halide abstraction resulted in formation of 5-fold coordinated cationic complexes 2. Uptake of π-acidic ligands gave cationic complex 3. Dicationic complex 4, containing two acetonitrile monodentate ligands, was prepared from Fe(OTf)2. The structure of 1 and 3 was studied in solid-state and in solution, including 15N NMR spectroscopy. Furthermore, the application as catalysts in sp2-sp3 Kumada cross-coupling was demonstrated, showing high reactivity with a catalyst loading of 1 mol% in 1 h reaction time at room temperature.
PMID:
42704181
Bibliographic data and abstract were imported from PubMed on 07 Sep 2026.
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