H. S. Yathirajan, M. A. Ashok, B. Narayana Achar and M. Bolte.
Trifluoperazinium dipicrate, Acta Cryst. (2007). E63, o1693-o1695Â Â Â Â The title compound [systematic name: 1-methyl-4-{3-[2-(trifluoromethyl)-10H-phenothiazin-10-yl]propyl}piperazine- 1,4-diium bis(2,4,6-trinitrophenolate)], C21H26F3N2S+·2C6H2N3O7-, belongs to a group of phenothiazine derivatives which exhibit tranquillizing activity. The dihedral angle between the two outer aromatic rings of the phenothiazine unit is 24.69 (7)°. The crystal packing is stabilized by N-H...O hydrogen bonds and several weak C-H...O contacts. The molecular conformation of the trifluoperazinium cation differs significantly from that in the hydrochloride.