Anion-Controlled Assembly
of Four Manganese Ions:
Structural, Magnetic, and Electrochemical Properties
of Tetramanganese Complexes Stabilized by Xanthene-Bridged Schiff
Base Ligands
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Abstract
The reaction of manganese(II) acetate with a xanthene-bridged
bis[3-(salicylideneamino)-1-propanol]
ligand, H<sub>4</sub>L, afforded the tetramanganese(II,II,III,III)
complex [Mn<sub>4</sub>(L)<sub>2</sub>(μ-OAc)<sub>2</sub>],
which has an incomplete double-cubane structure. The corresponding
reaction using manganese(II) chloride in the presence of a base gave
the tetramanganese(III,III,III,III) complex [Mn<sub>4</sub>(L)<sub>2</sub>Cl<sub>3</sub>(μ<sub>4</sub>-Cl)(OH<sub>2</sub>)], in
which four Mn ions are bridged by a Cl<sup>–</sup> ion. A pair
of L ligands has a propensity to incorporate four Mn ions, the arrangement
and oxidation states of which are dependent on the coexistent anions
