Crystal structure of (RS)-4-(3-carb-oxy-1-ethyl-6,8-di-fluoro-4-oxo-1,4-di-hydro-quinolin-7-yl)-2-methyl-piperazin-1-ium 3-carb-oxy-5-fluoro-benzoate.

ABSTRACT: In the title organic salt, C17H20F2N3O3 +·C8H4FO4 -, proton transfer leads to one protonated lomefloxacin mol-ecule (HLf+) and one 3-carb-oxy-5-fluoro-benzoate (5-F-Hip-) anion in the asymmetric unit. The HLf+ cation is bent, with a dihedral angle of 38.3 (1)° between the quinoline ring and the piperazinium moiety. In the crystal, two kinds of N-H⋯O and O-H⋯O hydrogen-bonded chains cross-link each other to produce a three-dimensional network structure that is additionally stabilized by weak C-H⋯O and C-H⋯F hydrogen bonds, as well as π-π inter-actions. The methyl group attached to the piperazinium ring is disordered over two sets of sites [refined ratio: 0.645 (5):0.335 (5)], indicating the presence of both enanti-omers of the cation in the structure.

SUBMITTER: Feng S 

PROVIDER: S-EPMC6323884 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature