Linking [FeⅢ3] triangles with “double-headed”phenolic oximes

摘要

The use of "double-headed" phenolic oximes produces a trigonal antiprismatic [FeⅢ3]2 cluster with an "internal cavity" filled with an additional Fe3+ ion. Magnetic measurements reveal that the competition between different exchange interactions leads to a low-spin ground multiplet weakly separated in energy from a complex pattern of low-lying excited levels. Phenolic oxime ligands have been studied extensively for their use in extractive hydrometallurgy since the pseudomacrocyclic arrangement created by two H-bonded, singly-deprotonated ligands provides an ideal fit for the square planar Cu2+ ion.1'2