title: Crystal structure of 1,3-bis-(1,3-dioxoisoindolin-1-yl)urea dihydrate: a urea-based anion receptor.
abstract: The whole mol-ecule of the title compound, C17H10N4O5·2H2O, is generated by twofold rotation symmetry and it crystallized as a dihydrate. The planes of the phthalimide moieties and the urea unit are almost normal to one another, with a dihedral angle of 78.62 (9)°. In the crystal, mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds, forming a three-dimensional framework structure. The crystal packing also features C-H⋯O hydrogen bonds and slipped parallel π-π inter-actions [centroid-centroid distance = 3.6746 (15) Å] involving the benzene rings of neighbouring phthalimide moieties.
authors.affiliation: Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001 Col., Chamilpa, CP 62209, Cuernavaca, Mexico.
authors.forename: Felipe
authors.initials: F
authors.lastname: Medrano
authors.affiliation: Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001 Col., Chamilpa, CP 62209, Cuernavaca, Mexico.
authors.forename: Sergio
authors.initials: S
authors.lastname: Lujano
authors.affiliation: Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001 Col., Chamilpa, CP 62209, Cuernavaca, Mexico.
authors.forename: Carolina
authors.initials: C
authors.lastname: Godoy-Alcántar
authors.affiliation: Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001 Col., Chamilpa, CP 62209, Cuernavaca, Mexico.
authors.forename: Hugo
authors.initials: H
authors.lastname: Tlahuext
keywords: crystal structure; isoindoline; phthalimides; protection of primary amines; urea; urea-based anion receptor