| Summary: | The asymmetric unit of the title compound, 7C10H8N2·4C10H13N3O2S·2H2O, contains two independent 2,4-hydroxybenzaldehyde 4-ethylthiosemicarbazone molecules, three and a half 4,4′-bipyridine molecules and one water molecule. Two of the 4,4′-bipyridine molecules lie on general positions and the other three on centers of inversion. The two 4,4′-bipyridine molecules on general positions and one of the three on special positions are disordered over two positions each with an occupancy of 0.50. The –NH—C(=S)—NH—NC fragment is close to planar in the two 2,4-hydroxybenzaldehyde 4-ethylthiosemicarbazone molecules (r.m.s. deviations = 0.04 and 0.05 Å). In the crystal, the Schiff base, N-heterocycle and water molecules engage in O—H...O, O—H...N and N—H...O hydrogen-bonding interactions, generating a layer structure.
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