The structures of three ionic compounds of levofloxacin (LevoH or Ci18H20FN3O4) − LevoH3[CoCl4]-H2O (I), LevoH3[ZnBr4]·H2O (II), LevoH3[CuBr4]-H2O·(III) are determined. The crystals of I-III are monoclinic; in compound III, the particles are packed so that the direction of the screw axis does not coincide with the largest unit cell parameter. The asymmetric unit of the unit cell contains two LevoH32+ and CoCl42− ions and two crystallization water molecules in I; two LevoH32+ and MBr42− (M = Cu, Zn) ions and two crystallization water molecules in II and III. The absolute structure of the crystals and the configuration of the chiral center of the levofloxacinium cation S are determined. The structures are stabilized by multiple hydrogen bonds, X−Y π and π-π interactions.

中文翻译：

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左氧氟沙星三种离子化合物的晶体结构

测定了左氧氟沙星（LevoH 或 Ci18H20FN3O4）- LevoH3[CoCl4]-H2O (I)、LevoH3[ZnBr4]·H2O (II)、LevoH3[CuBr4]-H2O·(III) 三种离子化合物的结构。I-III的晶体为单斜晶；在化合物 III 中，颗粒被填充，因此螺旋轴的方向与最大晶胞参数不一致。晶胞的不对称单元在I中含有两个LevoH32+和CoCl42-离子和两个结晶水分子；II 和 III 中的两个 LevoH32+ 和 MBr42- (M = Cu, Zn) 离子和两个结晶水分子。确定了晶体的绝对结构和左氧氟沙星阳离子 S 的手性中心的构型。结构通过多个氢键、X-Y π 和 π-π 相互作用而稳定。