Flash Communication: Exploring the Coordination of π‑Acids and Redox-Active Diatomics to a High-Spin and Highly Fluorinated Ferrous Compound.

Authors

Morgan Hern, Christopher D Hastings, Justin Q Hao, William W Brennessel, Brandon R Barnett

Published in

Organometallics. Volume 45. Issue 18. Pages 2190-2194. Sep 28, 2026. Epub Sep 08, 2026.

Abstract

A new trigonally symmetric ligand scaffold is reported from the reaction of tris-(2-aminoethyl)-amine (TREN) and methyl trifluoroacetate. Deprotonation and metalation with iron-(II) yields a trigonal monopyramidal ferrate that bears an open coordination site surrounded by C-F motifs. The weak-field ligand environment promoted by the fluorinated amidate donors leads to distinctive behaviors that are apparent in reactions with π-acids such as CO and tert-butylisocyanide. As shown by structural, spectroscopic, and computational studies, the trifluoromethyl substituents lead to an attenuation of π-backbonding capabilities, while also labilizing the Fe-N_amidate bonds. While no tractable reactivity with O₂ occurs, the ferrate irreversibly coordinates NO to yield a high-spin {FeNO}⁷ complex.

PMID:
42819528
Bibliographic data and abstract were imported from PubMed on 02 Oct 2026.

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