Abstract
A PRECISE investigation of the crystal structure of parabanic acid has been undertaken to obtain accurate bond-lengths and bond-angles for comparison with the crystal structures of diketopiperazine1 and cyanuric acid2, and with its infra-red spectrum. Crystals of parabanic acid were easily obtained by slowly cooling a hot, concentrated water solution. X-ray examination showed that the crystals belong to the monoclinic system with space group P21/n, and the unit cell dimensions are: a = 10.684, b = 8.194, c = 5.044 A.; β = 92°30′. There are four molecules in, the unit cell.
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References
Corey, R. B., J. Amer. Chem. Soc., 60, 1598 (1938).
Wiebenga, E. H., and Moerman, N. F., Z. Krist., 99, 217 (1938).
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DAVIES, D., BLUM, J. Crystal Structure of Parabanic Acid. Nature 173, 993 (1954). https://doi.org/10.1038/173993a0
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DOI: https://doi.org/10.1038/173993a0
