1 and 2 behaved as single-molecule magnets (SMMs) with the thermally activated energy barrier of 98(5) and 74(6) cm-1 under zero dc filed, respectively, whereas no SMM behavior was observed for 3 bridged by two μ-η1:η2-acetato ligands.  Furthermore, the effective energy barrier of 1 reaches a breakthrough among all POM-based SMMs.
THERM