Lu Jianjiang, Jalilov Almaz S, Kochi Jay K
Department of Chemistry, University of Houston, 4800 Calhoun, Houston, TX 77204, USA.
Acta Crystallogr C. 2009 May;65(Pt 5):o226-8. doi: 10.1107/S0108270109005277. Epub 2009 Apr 10.
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.
在氩气保护下，从干燥的乙腈中结晶出N,N'-二甲基吡嗪二鎓双（四氟硼酸）盐（C₆H₁₀N₂²⁺·2BF₄⁻，（I））和N,N'-二乙基吡嗪二鎓双（四氟硼酸）盐（C₈H₁₄N₂²⁺·2BF₄⁻，（II）），从而得以对它们进行单晶研究。在这两种晶体结构中，吡嗪二鎓双阳离子位于一个对称中心（位于环中心），并且每个吡嗪二鎓芳香环与两个中心对称相关的BF₄⁻阴离子形成π键。两种盐中均存在BF₄⁻与吡嗪二鎓离子之间的强阴离子-π相互作用以及弱C-H...F氢键。
