Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 1 (January 2013)

organic compounds

Acta Cryst. (2013). E69, o14-o15    [ doi:10.1107/S1600536812049057 ]

Cytosinium orotate dihydrate

G. Portalone

Abstract: The title compound, C4H6N3O+·C5H3N2O4-·2H2O or Cyt+·Or-·2H2O, was synthesized by a reaction between cytosine (4-amino-2-hy­droxy­pyrimidine, Cyt) and orotic acid (2,4-dihy­droxy-6-carb­oxy­pyrimidine, Or) in aqueous solution. The two ions are joined by two N+-H...O- (±)-(CAHB) hydrogen bonds, forming a dimer with graph-set motif R22(8). In the crystal, the ion pairs of the asymmetric unit are joined by four N-H...O inter­actions to adjacent dimers, forming hydrogen-bonded rings with R22(8) graph-set motif in a two-dimensional network. The formation of the three-dimensional array is facilitated by water mol­ecules, which act as bridges between structural sub-units linked in R32(8) and R32(7) hydrogen-bonded rings. The orotate anion is essentially planar, as the dihedral angle between the planes defined by the carboxylate group and the uracil fragment is 4.0 (4)°.

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