Abstract
Three ferrocene derivatives carrying different kinds of nitroxide radicals (1–3) were prepared as dual redox compounds. All of them have distorted molecular conformations between a Cp unit of a ferrocene group and a nitroxide group and the largest dihedral angle between the units is observed in the PO derivative 3. A unique magnetic behavior with a spin gap is disclosed in the derivative 3, reflecting two-dimensional interactions between the paired spins. Each derivative has two oxidation potentials based on both ferrocene and nitroxide groups and multi-step charge–discharge processes are found for all derivatives with the first discharge capacity over 200 A h kg−1.
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