N,N′‐Dimethylpyrazinediium bis(tetrafluoroborate) and N,N′‐diethylpyrazinediium bis(tetrafluoroborate): new examples of anion–π triads |
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Authors: | Jianjiang Lu Almaz S Jalilov Jay K Kochi |
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Abstract: | Crystallization of N,N′‐dimethylpyrazinediium bis(tetrafluoroborate), C6H10N22+·2BF4−, (I), and N,N′‐diethylpyrazinediium bis(tetrafluoroborate), C8H14N22+·2BF4−, (II), from dried acetonitrile under argon protection has permitted their single‐crystal studies. In both crystal structures, the pyrazinediium dications are located about an inversion center (located at the ring center) and each pyrazinediium aromatic ring is π‐bonded to two centrosymmetrically related BF4− anions. Strong anion–π interactions, as well as weak C—H...F hydrogen bonds, between BF4− and pyrazinediium ions are present in both salts. |
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