The crystal structure of maleic anhydride, C4H20 a, has been determined and refined by an analysis of three-dimensional X-ray diffraction data.The crystals are orthorhombie with space group P212121 ; the cell dimensions are: a=7-180+0.008,b=11.231_+0.015,c--5.39_+0.03/~.The maleic anhydride molecule is slightly non-planar, the oxygen atom within the five-membered ring lying 0-03 A from the plane of the other atoms.The nearest intermolecule neighbors are hydrogen and oxygen atoms, hut, there is no evidence of C~H • • • O hydrogen bonds.
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Marsh et al. (1962) studied this question.
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