Triphenylamine Derivatives with Para-Disposed Pendant Electron-Rich Organoiron Alkynyl Substituents: Defining the Magnetic Interactions in a Trinuclear Iron(III) Trication - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Organometallics Année : 2012

Triphenylamine Derivatives with Para-Disposed Pendant Electron-Rich Organoiron Alkynyl Substituents: Defining the Magnetic Interactions in a Trinuclear Iron(III) Trication

Résumé

The syntheses of two triarylamine derivatives featuring one and three electron-rich Fe(II) "(η2-dppe)(η5-C5Me5)FeC≡C-" pendant substituents in para position(s) on the aryl rings (1, 2) is reported, along with those of their corresponding radical tri- and monocations (13+, 2+). The former species (13+) constitutes a new organometallic triradical. The magnetic interactions between the Fe(III) units in this novel trication were investigated by NMR and SQUID. Its ground spin state was shown to be a doublet, with a "mean" antiferromagnetic coupling constant of J ≈ −14 cm-1 between the unpaired spins, from consideration of the classic Hamiltonian for a symmetric C3v triradical: H = −2J(Sa*Sb + Sb*Sc + Sc*Sa).
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hal-00847084 , version 1 (22-07-2013)

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Guillaume Grelaud, Olivier Cador, Thierry Roisnel, Gilles Argouarch, M. P. Cifuentes, et al.. Triphenylamine Derivatives with Para-Disposed Pendant Electron-Rich Organoiron Alkynyl Substituents: Defining the Magnetic Interactions in a Trinuclear Iron(III) Trication. Organometallics, 2012, 31 (5), pp.1635-1642. ⟨10.1021/om2006358⟩. ⟨hal-00847084⟩
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