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Figure 2
The evolution of the urea–phosphoric acid structure as a function of temperature between 150 and 335 K (drawn using ORTEPII, Johnson, 1971BB4, with 50% probability ellipsoids). The significant migration of the proton in the short strong hydrogen bond is emphasized by our choice of covalent bond limits for O—H bonds in these plots – at 315 K and above the H atom has moved sufficiently close to the midpoint of the O⋯O vector so as not to appear bonded to either in these plots.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 57| Part 3| May 2001| Pages 435-439
doi:10.1107/S0108768100018875
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