Spin state of two mononuclear iron(II) complexes of a tridentate bis(imino)pyridine N-donor ligand: Experimental and theoretical investigations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Polyhedron Année : 2022

Spin state of two mononuclear iron(II) complexes of a tridentate bis(imino)pyridine N-donor ligand: Experimental and theoretical investigations

Yosef Bayeh
  • Fonction : Auteur
Patrik Osuský
  • Fonction : Auteur
Róbert Gyepes
  • Fonction : Auteur
Assefa Sergawie
  • Fonction : Auteur
Peter Hrobárik
  • Fonction : Auteur
Rodolphe Clérac
Madhu Thomas
  • Fonction : Auteur

Résumé

Investigations on the spin states of octahedral Fe(II) complexes have received special attention due to their clear discrimination in the spin states of the d-orbitals. As a means to further understand the factors that influence the spin-crossover (SCO) phenomenon in Fe(II) systems, we herein report two mononuclear Fe(II) complexes, [FeL2](ClO4)2·2CH3OH (1) and [FeL2](BF4)2·CH3CN·CH3OH (2), derived from a novel N3-donor Schiff base ligand, 2,6-bis[(3-methylbenzylimino)methyl]pyridine (L) with varying counteranion and the diamagnetic [ZnL2](BF4)2 congener for a comparative investigation. The complexes have been synthesized and characterized by electrospray-ionization mass spectrometry (ESI-MS), Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) spectroscopy, single-crystal X-ray diffraction (XRD) and magnetic susceptibility studies. Structural and magnetic investigations reveal that both 1 and 2 show Fe__N6 distorted octahedral geometry and are locked in the diamagnetic LS state throughout the entire explored temperature range from 1.8 to 400 K. The LS state of [FeL2]2+ is also confirmed by comparing the experimentally found structural parameters, NMR chemical shifts and excitation energies in the visible region with density functional theory (DFT) calculations.
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hal-03868992 , version 1 (22-04-2023)

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Yosef Bayeh, Patrik Osuský, Nathan J. Yutronkie, Róbert Gyepes, Assefa Sergawie, et al.. Spin state of two mononuclear iron(II) complexes of a tridentate bis(imino)pyridine N-donor ligand: Experimental and theoretical investigations. Polyhedron, 2022, 227, pp.116136. ⟨10.1016/j.poly.2022.116136⟩. ⟨hal-03868992⟩

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