Tetragonal polymorph of 5,5-dichlorobarbituric acid

Tetragonal polymorph of 5,5-dichlorobarbituric acid

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 Cl...O contacts [3.201 (1) Å], and four suc...

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Bibliographic Details
Published in:Acta crystallographica. Section E, Structure reports online Vol. 68; no. 1; pp. o235 - o236
Main Authors: Gelbrich, Thomas, Rossi, Denise, Griesser, Ulrich J.
Format: Journal Article
Language:English
Published: International Union of Crystallography 01-01-2012
Online Access:Get full text
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Summary: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 Cl...O 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].
ISSN:1600-5368
1600-5368
DOI:10.1107/S1600536811054626