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The tetragonal polymorph of 5,5-dichlorobarbituric acid (m.p. 478 K), C4H2Cl2N2O3, forms an N—H
O hydrogen-bonded tape structure along [001]. Two tapes related by a twofold rotation axis are associated via ClO contacts [3.201 (1) Å], and four such chain pairs are arranged around a fourfold roto-inversion axis. The crystal structures of the monoclinic and orthorhombic polymorphs have been reported previously [Gelbrich et al. (2011). CrystEngComm, 13, 5502–5509].
O hydrogen-bonded tape structure along [001]. Two tapes related by a twofold rotation axis are associated via ClO contacts [3.201 (1) Å], and four such chain pairs are arranged around a fourfold roto-inversion axis. The crystal structures of the monoclinic and orthorhombic polymorphs have been reported previously [Gelbrich et al. (2011). CrystEngComm, 13, 5502–5509].
