Fun Hoong-Kun, Balasubramani Kasthuri
X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 Universiti Sains Malaysia, Penang, Malaysia.
Acta Crystallogr Sect E Struct Rep Online. 2009 Jun 6;65(Pt 7):o1496-7. doi: 10.1107/S1600536809020832.
In the title compound, C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-), the pyridine N atom is protonated. In the 4-hydroxy-benzoate anion, the carboxyl-ate group is twisted slightly out of the benzene ring plane by an angle of 3.77 (5)°. The protonated N atom and one of the two amino groups are hydrogen-bonded to the 4-hydroxy-benzoate anion through a pair of N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring motif. The crystal structure is further stabilized by O-H⋯O and C-H⋯O hydrogen bonds and π-π inter-actions involving the pyridinium rings [centroid-centroid distance of 3.6277 (5) Å], leading to the formation of a three-dimensional network.
在标题化合物C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-)中，吡啶N原子被质子化。在4-羟基苯甲酸根阴离子中，羧酸根基团与苯环平面稍有扭曲，扭曲角为3.77 (5)°。质子化的N原子和两个氨基中的一个通过一对N-H⋯O氢键与4-羟基苯甲酸根阴离子形成氢键，形成R(2) (2)(8)环 motif。晶体结构通过O-H⋯O和C-H⋯O氢键以及涉及吡啶鎓环的π-π相互作用[质心-质心距离为3.6277 (5) Å]进一步稳定，从而形成三维网络。
