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The hydrothermally synthesized Co7(μ3-OH)8(μ-ox)3(μ-ppz)3 contains heptanuclear hydroxo-bridged Co(II) clusters in the form of corner-fused double cubanes. Each cluster is further bridged by six oxalate (ox) and six piperazine (ppz) ligands with 12 other clusters into a 3-D structure.
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Chiang et al. (2001) studied this question.
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