Abstract
We report the magnetic properties of three cyclic hexanuclear iron(III) spin-clusters ([Fe 6(tea) 6] · 6MeOH ( 1), [NaFe 6(tea) 6]ClO 4 · 2MeOH ( 2) and [LiFe 6(tea) 6]ClO 4 · 2MeOH ( 3), (tea: triethanolaminate(3-)). The intra-molecular exchange coupling between the Fe III-spins is determined by measurements of the magnetic susceptibility in the range 2–300 K. The zero-field splitting of the lowest cluster spin states ( E/k B < 200K) is studied by ESR (electron-spin resonance) at frequencies between 9.5 and 350 GHz. The level splitting is analyzed by the irreducible-tensor operator technique.
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