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There are three independent mol­ecules in the asymmetric unit of the title compound, C12H15Br3O3, two of which have approximate trigonal symmetry, the third being conformationally different as it adopts near mirror symmetry. The crystal structure features C—H...Br inter­actions, a weak C—H...O hydrogen bond, π–π inter­actions [minimum ring centroid separation = 3.4927 (18) Å] and a short Br...Br contact [3.5894 (5) Å], resulting in a three-dimensional supramolecular network.

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The title mol­ecule, C36H27N3O9, adopts an almost symmetric conformation in which the mean planes of the phthalimido units are inclined at dihedral angles of 81.1 (1), 85.3 (1) and 86.3 (1)° with respect to the plane of the central aromatic ring. The O atoms are involved in intra- and inter­molecular C—H...O hydrogen bonding. The crystal structure also features π–π arene inter­actions [minimum ring centroid separation = 3.683 (2) Å]. The present mode of non-covalent interactions leads to a three-dimensional supramolecular architecture.
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