Molecular [(Fe<sub>3</sub>)–(Fe<sub>3</sub>)] and [(Fe<sub>4</sub>)–(Fe<sub>4</sub>)] Coordination Cluster Pairs as Single or Composite Arrays
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The synthesis of molecular cluster pairs is a challenge for coordination chemists due to the potential applications of these species in molecular spintronics or quantum computing. The ligand H4L, 1,3-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-2-methoxybenzene, has been successfully used to obtain a series of such complexes using the basic Fe(III) trinuclear carboxylates as starting materials. Synthetic control has allowed the isolation of the two molecular cluster pairs that form the composite [Fe4O2(PhCO2)6(H2L)(pz)]2[Fe3O(PhCO2)5(py)(H2L)]2 (1). The dimers of trinuclear units, [Fe3O(PhCO2)5(H2O)(H2L)]2 (2) and [Fe3O(o-MePhCO2)5(H2L)(py)]2 (3), and the dimers of tetranuclear units, [Fe4O2(PhCO2)6(H2L)(pz)]2 (4) and [Fe4O2(o–MePhCO2)6(H2L)(pz)]2 (5), are presented here. The magnetic properties of the reported aggregates show that they are pairs of semi-independent clusters weakly interacting magnetically as required for two-qubit quantum gates.
