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of the ring MnIII ions.Three salts containing the 4-(4-fluoro-phen-yl)piperazin-1-ium cation have been prepared and structurally characterized. In 4-(4-fluoro-phen-yl)piperazin-1-ium 2-hy-droxy-3,5-di-nitro-benzoate, C10H14FN2 +·C7H3N2O7 -, (I), the anion contains an intra-molecular O-H⋯O hydrogen bond, and it has a structure similar to that of the picrate ion. The cations and anions are linked into [001] chains of rings by a combination of two three-centre N-H⋯(O)2 hydrogen bonds. The anion in 4-(4-fluoro-phen-yl)piperazin-1-ium hydr