Hemamalini Madhukar, Fun Hoong-Kun
X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.
Acta Crystallogr Sect E Struct Rep Online. 2010 Feb 27;66(Pt 3):o691-2. doi: 10.1107/S1600536810006392.
The asymmetric unit of the title compound, C(5)H(7)N(2) (+)·C(2)F(3)O(2) (-), contains four independent 2-amino-pyridinium cations and four independent trifluoro-acetate anions. In the crystal structure, these ions are linked by N-H⋯O hydrogen bonds, forming four cation-anion pairs each containing an R(2) (2)(8) ring motif. The ion pairs are linked into two independent chains along [100] by N-H⋯O hydrogen bonds. In addition, C-H⋯O and C-H⋯F hydrogen bonds and π⋯π inter-actions [centoid-centroid separation = 3.6007 (17) Å] are observed.
标题化合物C(5)H(7)N(2) (+)·C(2)F(3)O(2) (-)的不对称单元包含四个独立的2-氨基吡啶阳离子和四个独立的三氟乙酸根阴离子。在晶体结构中，这些离子通过N-H⋯O氢键相连，形成四个阳离子-阴离子对，每个对都包含一个R(2) (2)(8)环 motif。离子对通过N-H⋯O氢键沿[100]方向连接成两条独立的链。此外，还观察到C-H⋯O和C-H⋯F氢键以及π⋯π相互作用[质心-质心间距 = 3.6007 (17) Å]。
