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Four donor/acceptor complexes between halide anion donors and the tetraiodoethene acceptor molecule with tetra(n-butyl)ammoniumcountercations, {(H 9 C 4 ) 4 N ⊕ X ⊖ ···I 2 C=CI 2 )} (X ⊖  = Cl ⊖ , Br ⊖ , I ⊖ , SCN ⊖ ) could be crystallized from acetone solutions of the components R 4 N ⊕ X ⊖  and I 2 C=CI 2  by using low gradient techniques, and their structures determined at low temperature. Their molecule packing motif are layers of halide anion/tetraiodoethene patterns, which are penetrated by one of the four R 4 N ⊕  n-butyl chains. The structure comparison, including analogous ones from an extensive Cambridge Structural Database search, discusses the geminal or vicinal addition to dimer subunits {X ⊖ ···I 2 C=CI 2 } 2  as well as their ribbon formation via additional contacts X ⊖ ···I, and the effects of the voluminous R 4 N ⊕  countercations. Altogether some light is shedded on essential facets of the fascinating self-assembly comprising an electron-rich halide anion and a polyiodo acceptor molecule.

zeitschrift für naturforschung b

Wechselwirkungen in Molekülkristallen, 179 [1, 2]. σ-Donator/Akzeptor-Komplexe {I 2 C=CI 2 ···X ⊖  } (X ⊖  = Cl ⊖  , Br ⊖  , I ⊖  , SCN ⊖  ) von Tetraiodethen in Tetra(n-butyl)ammoniumhalogenid-Salzen / Interaction in Molecular Crystals, 179 [1, 2]. σ-Donor/Acceptor Complexes {I 2 C=CI 2 ···X ⊖ } (X ⊖ = Cl ⊖ , Br ⊖ , I ⊖ , SCN ⊖ ) of Tetraiodoethene in Tetra(n-butyl)ammonium Halide Salts