Tetranuclear and Octanuclear Cobalt(II) Citrate Cluster Single Molecule Magnets
Boujemaa Moubaraki, Keith S Murray, Timothy A Hudson, Richard Robson
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | WILEY-V C H VERLAG GMBH | Published : 2008
In a follow-up study of the cobalt(II) member 1 of a family of isostructural cubane clusters of type [C(NH2)3] 8[MII4(cit)4]· 8H 2O (cit = citrate, M = Mg, Mn, Fe, Co, Ni, Zn) by measuring AC magnetic susceptibilities, as a function of frequency, this compound clearly displays behaviour typical of magnetization reversal and slow magnetic relaxation (ΔE = 13.1 K, τo = 8.4 × 10-7 s). A related octanuclear cluster [Co8(C4O 7)4-(H2O)12]·24H 2O (2) that contains a [Co4(C4O 7)4] cubane moiety, behaves likewise (ΔE = 20.5 K, τo = 1.0 × 10-7 s). © Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
The authors acknowledge financial support for this work from ARC Discovery grants (to KSM and RR). Kevin Berry is thanked very much for making new calculations.