B. Pilawa et al., MAGNETIC-PROPERTIES OF NEW FE-6(TRIETHANOLAMINATE(3-))(6) SPIN-CLUSTERS, Journal of magnetism and magnetic materials, 177, 1998, pp. 748-749
We report the magnetic properties of three cyclic hexanuclear iron(III
) spin-clusters ([Fe-6(tea)(6)].6MeOH (1), [NaFe6(tea)(6)]ClO4.2MeOH (
2) and [LiFe6(tea)(6)]ClO4.2MeOH (3), (tea: triethanolaminate(3-)). Th
e intra-molecular exchange coupling between the Fe-III-spins is determ
ined 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)
< 200 K) is studied by ESR (electron-spin resonance) at frequencies b
etween 9.5 and 350 GHz, The level splitting is analyzed by the irreduc
ible-tenser operator technique. (C) 1998 Elsevier Science B.V. All rig
hts reserved.