Flash Communication: Rearrangement of a tris-Carbene Ligand Precursor to an all-N-Bound tris-Imidazole Iron Complex: Flipping the Umbrella

Hartmann T, Pick L, Heinemann FW, Scheurer A, Meyer K (2025)

Publication Type: Journal article

Publication year: 2025

Journal

DOI: 10.1021/acs.organomet.4c00445

Abstract

Treatment of the ligand precursor H3TIMMN^MesCl3 (TIMMN^Mes = tris-[(3-mesityl-imidazol-2-ylidene)methyl]amine) with an excess of base yields the literature-known ferrous tris-N-heterocyclic carbene (NHC) complex [(TIMMN^Mes)Fe^IICl]Cl (1-Cl). In contrast, utilizing a substoichiometric amount of base initiates a unique rearrangement of all three NHC pendant arms to yield the tripodal, all-N-bound tris-imidazole [(N-TIMMN^Mes)Fe^IICl]Cl (2-Clsol). Divalent 2-Cl and 2-PF6 are fully characterized, structurally by single-crystal X-ray diffraction analysis and spectroscopically by ¹H NMR and ⁵⁷Fe Mössbauer spectroscopy as well as SQUID magnetization measurements, to demonstrate the influence of the change from a soft strong-field to a hard weak-field ligand. Optimized reaction conditions for the reproducible, high-yield carbene-to-imidazole rearrangement were developed in a series of experiments.

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How to cite

APA:

Hartmann, T., Pick, L., Heinemann, F.W., Scheurer, A., & Meyer, K. (2025). Flash Communication: Rearrangement of a tris-Carbene Ligand Precursor to an all-N-Bound tris-Imidazole Iron Complex: Flipping the Umbrella. Organometallics. https://doi.org/10.1021/acs.organomet.4c00445

MLA:

Hartmann, Tom, et al. "Flash Communication: Rearrangement of a tris-Carbene Ligand Precursor to an all-N-Bound tris-Imidazole Iron Complex: Flipping the Umbrella." Organometallics (2025).

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