We report the synthesis and X‐ray characterization of an N,N′‐tetramethylenebis(2‐aminopyrimidinium) tetrafluoroborate salt that exhibits anion–π interactions that are responsible for the crystal packing. The anion forms a sandwich complex with two pyrimidine rings. When the anion is nitrate, the crystal packing is governed by anion–π interactions and hydrogen bonds, and the sandwich complex is not formed. Finally, a theoretical study of the anion–π interactions in charged pyrimidine rings is in good agreement with the experimental findings. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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García‐Raso et al. (2007) studied this question.
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