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Acta Cryst. (2014). C70, 241-249  [ doi:10.1107/S2053229614001387 ]

N-H...S and N-H...O hydrogen bonds: `pure' and `mixed' R22(8) patterns in the crystal structures of eight 2-thio­uracil derivatives

W. M. Hützler and E. Egert

Synopsis: The preferred hydrogen-bonding patterns in eight crystal structures of 2-thiouracil derivatives were analysed. In five of the structures, the usual pairs of N-H...S or N-H...O hydrogen bonds are formed, whereas three structures contain `mixed' R22(8) patterns with one N-H...S and one N-H...O hydrogen bond.

Formula: C7H10N2OS, C5H6N2O2S, C5H6N2O2S·C4H9NO, C6H8N2OS, C6H8N2OS·C5H9NO, 2C6H8N2OS·C3H7NO, 2C6H8N2OS·C4H9NO and 2C6H8N2OS·C2H6OS

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