title: N,N'-dimethylpyrazinediium bis(tetrafluoroborate) and N,N'-diethylpyrazinediium bis(tetrafluoroborate): new examples of anion-pi triads.
abstract: Crystallization of N,N'-dimethylpyrazinediium bis(tetrafluoroborate), C(6)H(10)N(2)(2+).2BF(4)(-), (I), and N,N'-diethylpyrazinediium bis(tetrafluoroborate), C(8)H(14)N(2)(2+).2BF(4)(-), (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 pi-bonded to two centrosymmetrically related BF(4)(-) anions. Strong anion-pi interactions, as well as weak C-H...F hydrogen bonds, between BF(4)(-) and pyrazinediium ions are present in both salts.
authors.affiliation: Department of Chemistry, University of Houston, 4800 Calhoun, Houston, TX 77204, USA. jlu10@mail.uh.edu
authors.forename: Jianjiang
authors.initials: J
authors.lastname: Lu
authors.forename: Almaz S
authors.initials: AS
authors.lastname: Jalilov
authors.forename: Jay K
authors.initials: JK
authors.lastname: Kochi
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D000838:Anions / Q000737:chemistry; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D015394:Molecular Structure; D011719:Pyrazines / Q000737:chemistry*
chemical_list: D000097:Acetonitriles; D000838:Anions; C542181:N,N'-diethylpyrazinediium bis(tetrafluoroborate); C542180:N,N'-dimethylpyrazinediium bis(tetrafluoroborate); D011719:Pyrazines; C032159:acetonitrile