The partially THF-solvated dipotassium salt of the novel bis-chelating dianion [ButN(Se)P(μ-NBut)2P(Se)NBut ]2− forms an infinite network of twenty-membered K6Se6P4N4 rings involving two types of K···Se interactions.
An extended network of twenty-membered K6Se6P4N4 rings: X-ray structure of {[(THF)K[ButN(Se)P(μ-NBut)2P(Se)N But]K(THF)2]2}∞
T. Chivers, M. Krahn and M. Parvez, Chem. Commun., 2000, 463 DOI: 10.1039/B000357N
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