A Ni8 cube, assembled with twelve bridging μ-violurato ligands, is present in 1 (H3vi = violuric acid). The oximate groups of the ligands lie along the edges of the cube, connecting the metal ions in an unprecedented trans conformation (see picture, • Ni) and mediating a strong antiferromagnetic coupling between the paramagnetic centers about 5 Å apart. Counterions: Ni2+, 4 K+.
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Faus et al. (1996) studied this question.
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