Fun Hoong-Kun, Balasubramani Kasthuri, Yeap Chin Sing
X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.
Acta Crystallogr Sect E Struct Rep Online. 2009 Jul 15;65(Pt 8):o1854-5. doi: 10.1107/S1600536809026439.
In the title salt, 2C(5)H(8)N(3) (+)·C(4)H(4)O(4) (2-)·3H(2)O, the asymmetric unit contains a protonated 2,3-diamino-pyridinium cation, half of a succinate dianion (disposed about a centre of inversion), and one and a half water mol-ecules. One of the water mol-ecules is disordered over two sites with occupancies of 0.670 (17) and 0.330 (17). The other water mol-ecule has an occupancy of 0.5 (from refinement). The pyridine N atom of the 2,3-diamino-pyridine mol-ecule is protonated. The protonated N atom and one of the 2-amino H atoms are hydrogen bonded to the succinate anion through a pair of N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring motif. In the crystal, mol-ecules are consolidated into a three-dimensional network by N-H⋯O and O-H⋯O inter-actions.
在标题盐2C₅H₈N₃⁺·C₄H₄O₄²⁻·3H₂O中，不对称单元包含一个质子化的2,3-二氨基吡啶阳离子、半个琥珀酸二阴离子（关于一个反演中心排列）和一个半水分子。其中一个水分子在两个位置上无序分布，占有率分别为0.670 (17) 和0.330 (17)。另一个水分子的占有率为0.5（精修得到）。2,3-二氨基吡啶分子的吡啶N原子被质子化。质子化的N原子和其中一个2-氨基H原子通过一对N-H⋯O氢键与琥珀酸阴离子形成氢键，形成R₂²(8)环 motif。在晶体中，分子通过N-H⋯O和O-H⋯O相互作用巩固成三维网络。
