Received 22 July 2009
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-HO, O-HN and N-HO hydrogen-bonding interactions, generating a layer structure.
4,4'-Bipyridine forms a number of clathrates with diphenols; for the quinol clathrate, see: Oswald et al. (2005) and for the 2,2'-biphenol clathrate, see: Lavender et al. (1999). For the crystal structure of 2,4-dihydroxybenzaldehyde 4-ethylthiosemicarbazone, see: Tan et al. (2008).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CI2864 ).
The author thanks the University of Malaya for supporting this study.
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