Fun Hoong-Kun, Hemamalini Madhukar, Shetty Divya N, Narayana B, Yathirajan H S
Acta Crystallogr Sect E Struct Rep Online. 2010 Feb 27;66(Pt 3):o714-5. doi: 10.1107/S1600536810006835.
The pefloxacinium cation of the title salt, C(17)H(21)FN(3)O(3) (+)·C(6)H(2)N(3)O(7) (-), is composed of an essentially planar quinoline ring system [maximum deviation = 0.021 (2) Å] and a piperazine ring, which adopts a chair conformation. In the picrate anion, the two O atoms of one of the o-NO(2) groups are disordered over two positions, with an occupancy ratio of 0.56 (4):0.44 (4). In the crystal structure, cations and anions are connected by inter-molecular N-H⋯O, O-H⋯O, C-H⋯O and C-H⋯F hydrogen bonds, forming a three-dimensional network. In addition, π-π inter-actions between the pyridine rings and between the benzene rings of the anions, with centroid-centroid distances of 3.6103 (12) and 3.5298 (11) Å, respectively, are observed.
标题盐C(17)H(21)FN(3)O(3) (+)·C(6)H(2)N(3)O(7) (-)的培氟沙星阳离子由一个基本平面的喹啉环系统[最大偏差 = 0.021 (2) Å]和一个呈椅式构象的哌嗪环组成。在苦味酸根阴离子中，其中一个邻硝基基团的两个O原子在两个位置上无序排列，占有率比为0.56 (4):0.44 (4)。在晶体结构中，阳离子和阴离子通过分子间的N-H⋯O、O-H⋯O、C-H⋯O和C-H⋯F氢键相连，形成三维网络。此外，还观察到阴离子的吡啶环之间以及苯环之间的π-π相互作用，质心间距分别为3.6103 (12) 和3.5298 (11) Å。
