A New Type of Hexanuclear Iron(<scp>III</scp>) Hydroxo(oxo) Cluster

Abstract

Bridging μ 3 ‐oxo and μ 2 ‐hydroxo ligands characterize the structure of the cluster anion 1 , which can be prepared as a highly soluble K or Na salt in water. The structure of 1 can be viewed as two parallel, μ 3 ‐oxo‐bridged Fe 3 triangles joined by μ‐hydroxo bridges or as two Fe 4 butterfly structures with shared wing tips. Cluster 1 has more short FeFe separations than all other related compounds, and its effective magnetic moment μ eff increases dramatically at low temperatures. This magnetic behavior is not completely understood. equation image