Abstract
AbstractThe triple helicate dinuclear iron(II) complex, [Fe2(L)3](ClO4)4·2H2O (1), previously reported by Tuna et al. (Chem. Eur. J. 2004, 10, 5737), was prepared and characterised by detailed SQUID and 57Fe Mössbauer measurements. Compound 1 exhibits a thermochromic two‐step spin conversion at TSC(1) ca. 240 K and TSC(2) ca. 120 K, but does not switch its spin state further below 20 K as proven by Mössbauer spectroscopy. The sharp variation of the susceptibility below 20 K is due to zero‐field splitting of the remaining iron(II) high‐spin species. Applied field 57Fe Mössbauer spectroscopy experiments at 4.2 K indicate that the gradual thermal spin conversion from [HS–HS] pairs to [LS–LS] pairs is complete for one half of the FeII active sites. The presence of a step tracked in the spin‐conversion curve and through the variation of the Mössbauer parameters of an uncoupled iron(II) site call for the occurrence of an [LS–HS] intermediate spin state in the plateau region.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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