Grid ion: A Cu16 grid prepared with a tetratopic bishydrazone ligand has metal ions in a [4×4] array linked by a combination of μ-Ohydrazone and μ-NNpyridazine bridges. The six-coordinate copper ions display Jahn–Teller distortion, leading to some orbitally orthogonal bridges. Multiple intragrid magnetic-exchange pathways are present and are modeled simply by taking the molecular symmetry and the orthogonal connections into account.
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Dawe et al. (2007) studied this question.