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The 1,2,3,4-tetraphenyl-shielded sodium cyclopentadienide, Na ⊕ [HC 5  ⊖ (C 6 H 5 ) 4 ], demonstrates essential facets of structure-determining cation solvation. The following solvent-shared or solvent-separated ion multiples have been crystallized from the respective aprotic ether solutions and structurally characterized: [(C 29 H 21  ⊖ )Na ⊕ (THF) 7/2 ], [(C 29 H 21  ⊖ )Na ⊕ (DME) 2 ]. [(C 29 H 21  ⊖ )] ⊖ [Na ⊕ (diglyme) 2 ] ⊕ , [(C 29 H 21  ⊖ )] ⊖ [Na ⊕ (triglyme) 2 ] ⊕  and, from 18-crown-6 solution, the novel tripeldecker ion triple, [(C 29 H 21  ⊖ )] ⊖ [Na ⊕ (18-crown-6)Na ⊕ (18-crown-6)Na ⊕ (18-crown-6)] ⊕⊕ , which contains two Na ⊕  counter cations between three 18-crown-6 discs. The structures, discussed in comparison with literature data and based on MNDO calculations, demonstrate the essential effects of Na ⊕  counter cation solvation by various ether ligands.

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Wechselwirkungen in Molekülkristallen, 126 [1,2]. Die Kationen-Solvatation in solvens-umhüllten und solvens-getrennten Ionen- Multipeln von 1,2,3,4-Tetraphenylcyclopentadienyl-Natrium-Salzen / Interactions in Molecular Crystals, 126 [1,2]. The Cation Solvation in Solvent-Shared and Solvent-Separated Ion Multiples of 1,2,3,4-Tetraphenylcyclopentadienyl-Sodium Salts