y-Hydroquinone is monoclinic, P21/c, a= 8.07, b= 5.20, c= 13.20 A, fl= 107 °. The unit cell contains 4 molecules, two and two not dependent on space-group symmetry. The centres of the benzene rings are situated at the crystallographic centres of symmetry (0, 0, 0), (0, 3, 3) and (3, 0, ½), (3, 3, 0). The hydrogen bonds form helices around the screw axes. The O-O distances in the hydrogen bonds are 2.84/~.
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