Hemamalini Madhukar, Goh Jia Hao, Fun Hoong-Kun
X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.
Acta Crystallogr Sect E Struct Rep Online. 2011 Nov;67(Pt 11):o3121. doi: 10.1107/S1600536811044461. Epub 2011 Oct 29.
In the title mol-ecular salt, C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-), the 2,3-diamino-pyridinium cation is essentially planar, with a maximum deviation of 0.006 (2) Å. In the crystal, adjacent cations and anions are linked by pairs of N-H⋯O hydrogen bonds, generating R(2) (2)(8) loops. These dimers are linked by further N-H⋯O hydrogen bonds and C-H⋯O inter-actions to form sheets lying parallel to (001). A typical intra-molecular O-H⋯O hydrogen bond is also observed in the salicylate (2-hy-droxy-benzoate) anion, which generates an S(6) ring. The crystal structure also features π-π stacking inter-actions between the pyridinium rings of the cations, with a centroid-centroid distance of 3.5896 (15) Å.
在标题分子盐C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-)中，2,3 - 二氨基吡啶阳离子基本呈平面状，最大偏差为0.006 (2) Å。在晶体中，相邻的阳离子和阴离子通过N - H⋯O氢键对相连，形成R(2) (2)(8)环。这些二聚体通过进一步的N - H⋯O氢键和C - H⋯O相互作用连接，形成平行于(001)的片层。在水杨酸盐（2 - 羟基苯甲酸盐）阴离子中还观察到典型的分子内O - H⋯O氢键，形成一个S(6)环。晶体结构还具有阳离子吡啶环之间的π - π堆积相互作用，质心 - 质心距离为3.5896 (15) Å。
