Gridlock! A [2×2] Fe4 grid complex (see picture) with unprecedented stability features two orthogonal switching modes: spin-crossover and redox processes. Oxidation also switches between antiferromagnetic and ferromagnetic coupling. The [HS-LS-HS-LS] FeII4 and [FeII2FeIII2] forms are both twofold degenerate, with identical metal ions located at diagonal vertices of the grid, making the system an attractive component for quantum cellular automata.
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Schneider et al. (2010) studied this question.
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