Lyakhov Alexander S, Ivashkevich Ludmila S, Survilo Vladimir L, Trukhachova Tatjana V
Research Institute for Physico-Chemical Problems of Belarusian State University, Leningradskaya Street 14, Minsk 220030, Belarus.
Acta Crystallogr C. 2012 Jan;68(Pt 1):o33-6. doi: 10.1107/S0108270111054692. Epub 2011 Dec 23.
Crystals of bis(2-ethyl-3-hydroxy-6-methylpyridinium) succinate-succinic acid (1/1), C(8)H(12)NO(+)·0.5C(4)H(4)O(4)(2-)·0.5C(4)H(6)O(4), (I), and 2-ethyl-3-hydroxy-6-methylpyridinium hydrogen succinate, C(8)H(12)NO(+)·C(4)H(5)O(4)(-), (II), were obtained by reaction of 2-ethyl-6-methylpyridin-3-ol with succinic acid. The succinate anion and succinic acid molecule in (I) are located about centres of inversion. Intermolecular O-H···O, N-H···O and C-H···O hydrogen bonds are responsible for the formation of a three-dimensional network in the crystal structure of (I) and a two-dimensional network in the crystal structure of (II). Both structures are additionally stabilized by π-π interactions between symmetry-related pyridine rings, forming a rod-like cationic arrangement for (I) and cationic dimers for (II).
琥珀酸 - 琥珀酸双（2 - 乙基 - 3 - 羟基 - 6 - 甲基吡啶鎓）（1/1），C(8)H(12)NO(+)·0.5C(4)H(4)O(4)(2-)·0.5C(4)H(6)O(4)，（I），以及2 - 乙基 - 3 - 羟基 - 6 - 甲基吡啶鎓氢琥珀酸盐，C(8)H(12)NO(+)·C(4)H(5)O(4)(-)，（II），是通过2 - 乙基 - 6 - 甲基吡啶 - 3 - 醇与琥珀酸反应得到的。（I）中的琥珀酸根阴离子和琥珀酸分子位于对称中心附近。分子间的O - H···O、N - H···O和C - H···O氢键导致（I）的晶体结构中形成三维网络，（II）的晶体结构中形成二维网络。两种结构还通过对称相关吡啶环之间的π - π相互作用得到稳定，（I）形成棒状阳离子排列，（II）形成阳离子二聚体。
