Violuric acid monohydrate: a second polymorph with more extensive hydrogen bonding.
Crystals of a second polymorph of violuric acid monohydrate [systematic name: pyrimidine-2,4,5,6(1H,3H)-tetrone monohydrate], C(4)H(3)N(3)O(4).H(2)O, have higher density and a more extensive hydrogen-bonding arrangement than the previously reported polymorph. Violuric acid and water molecules form essentially planar hydrogen-bonded sheets, which are stacked in an offset ...ABCABC... repeat pattern involving no ring-stacking interactions.
Guille
Kathy
K
School of Natural Sciences (Chemistry), Newcastle University, Newcastle upon Tyne, England.
Harrington
Ross W
RW
Clegg
William
W
D001463:Barbiturates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007536:Isomerism; D008968:Molecular Conformation
D001463:Barbiturates; C094277:violuric acid