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Homoleptic versus Heteroleptic Formation of Mononuclear Fe(II) Complexes with Tris-Imine Ligands

Abstract : We show a marked tendency of Fe(II) to form heteroleptic [Fe(L)(L')](ClO4)2 complexes from pairs of chelating tris-imine 3bpp, tpy, or 2bbp ligands. New synthetic avenues for spin crossover research become thus available, here illustrated with three new heteroleptic compounds with differing magnetic behaviors: [Fe(H4L1)(Cl-tpy)](ClO4)2·C3H6O (1), [Fe(H2L3)(Me3bpp)](ClO4)2·C3H6O (2), [Fe(H4L1)(2bbp)](ClO4)2·3C3H6O (3). Structural studies demonstrate that 1 is in the low-spin (LS) state up to 350 K, while complexes 2 and 3 are, by contrast, in the high-spin (HS) state down to 2 K, as corroborated through magnetic susceptibility measurements. Upon exposure to the atmosphere, the latter exhibits the release of three molecules of acetone per complex, turning into the solvent-free analogue [Fe(H4L1)(2bbp)](ClO4)2 (3a), through a single-crystal-to-single-crystal transformation. This guest extrusion process is accompanied by a spin switch, from HS to LS
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01304298
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, April 19, 2016 - 3:24:03 PM
Last modification on : Wednesday, October 14, 2020 - 3:43:38 AM

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Leoní A. Barrios, Carlos Bartual-Murgui, Eugènia Peyrecave-Lleixà, Boris Le Guennic, Simon J. Teat, et al.. Homoleptic versus Heteroleptic Formation of Mononuclear Fe(II) Complexes with Tris-Imine Ligands. Inorganic Chemistry, American Chemical Society, 2016, 55 (9), pp.4110-4116. ⟨10.1021/acs.inorgchem.5b02058⟩. ⟨hal-01304298⟩

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