Square-planar iron(III) species bearing no axial ligands can still behave as spin-admixed systems (S=3/2, 5/2). The highly unusual homoleptic σ-organoiron complex [Li(thf)4][FeIII(C6Cl5)4] (see anion in picture; green Cl, gray C) is an example of such a system.
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Alonso et al. (2006) studied this question.
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