The X-ray analysis revealed that the title compound is an infinite 3 1 screw-chain structure with a repeat distance of 8.453 A. The O atoms of the water connect to one another around the screw axis to form the core of the chain and the o-phenanthroline molecules connect through intermolecular hydrogen bonds to these water molecules. The structure can be regarded as a screw supermolecule assembled by hydrogen bonds and is a displacive modulation of an idealized P3 1 21 parent structure.
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Tian et al. (1995) studied this question.