Abstract

The title compound isN,N′-DiphenylpiperazineN,N′-dioxide octahydrate, C16H34N2O10:Mr=414.46, orthorhombic, space groupPnma (No. 62),a=12.327(2),b=9.804(1),c=17.443(4) A,Vc=2108.1(5) A3,Z=4. The structure was solved by the direct method and refined toR=0.056 for 3032 observed MoKα reflections. In theN,N′-dioxide molecule, all atoms except those of the methylene groups lie on a crystallographic mirror plane. The piperazine ring takes the chair form, with two N-O bonds oriented axially in atrans configuration. The crystal structure is characterized by strong hydrogen bonding between the water molecules, as well as between theN-oxide groups and water molecules, giving rise to a three-dimensional network structure composed of edge-sharing four-membered, five-membered, six-membered, and fourteen-membered rings.

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