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The P7-skeleton of trilithiumheptaphosphide, Li 3 P 7  (1), was proved to possess the earlier reported tricyclic structure [2] by complete analysis of the  31 P NMR spectrum of  6 Li 3 P 7  observed at - 60 °C. The  6 Li isotopic substitution was carried out to avoid the line broadening caused by the large quadrupole moment of the  7 Li isotope. The unambiguous elucidation of the Li 3 P 7  structure confirmed that the exchange process which causes all P atoms to become equivalent above room temperature is analogous to that in bullvalene. A comparison of the chemical shifts with those of (Me 3 Si) 3 P 7  leads to the result that the P 7 -skeleton in Li 3 P 7  is noticeably compressed along its threefold axis, thus indicating a predominant ionic character.

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Beiträge zur Chemie des Phosphors, 96 [1] Darstellung und  31 P-Kernresonanzspektrum von isotopen-substituiertem Trilithium-heptaphosphid,  6 Li 3 P 7  / Contributions to the Chemistry of Phosphorus, 96 [1] Preparation and  31 P NMR Spectrum of Isotopicly Substituted Trilithiumheptaphosphide,  6 Li 3 P 7