A synchrotron diffraction study of two polymorphic forms of 2, 5-bis

Two polymorphs, alpha and gamma, of the title compound, C(22)H(20)N(2)O(2), have been characterized by means of single-crystal synchrotron X-ray diffraction. In the alpha form, the molecules pack in a herring-bone fashion, linked via weak C-H.N intermolecular interactions (H.N 2.58 A). In the gamma form, the molecules are arranged in nearly planar sheets, which form a network held together by intermolecular hydrogen bonds of the type C-H.O (H. O 2.49 A) and C-H.N (H.N 2.50 A). The stacking distance between the sheets is 3.40 A.