Acta Cryst. (2004). E60, o1367-o1369  [ doi:10.1107/S1600536804017222 ]

3,7-Bis(dimethylamino)phenothiazin-5-ium nitrate dihydrate

S. J. Kavitha, M. M. Raj, K. Panchanatheswaran and D. E. Lynch

Abstract: The reaction of 3,7-bis(dimethylamino)phenothiazin-5-ium chloride pentahydrate (methylene blue) with silver nitrate in a 1:2 molar ratio in water yielded the title compound, C₁₆H₁₈N₃S⁺·NO₃^-·2H₂O, as one of the products. The cationic dye molecules are planar and stacked in an antiparallel fashion, exhibiting - associations at a distance of 3.7040  (18)  Å. The nitrate anion and the two water molecules are involved in a hydrogen-bonding network that also includes the phenothiazinium N atom.

Online 24 July 2004

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