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In the title compound, C15H11N5O, which was prepared as part of a study to identify fluoro­genic substrates for the Cu-catalysed azide–alkyne cyclo­addition (CuAAC) reaction, the benzoxa­diazole unit and the triazole ring are much more closely coplanar [dihedral angle = 10.92 (7)°] than either is to the benzyl group [dihedral angles = 69.13 (3)° and 78.20 (4)°, respectively]. The crystal structure features two different sets of weak inter­molecular C—H...N inter­actions between adjacent benzoxadiazole and triazole rings, forming a chain that propagates in the [-110] direction parallel to the ab plane.

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The title compound, C15H17N5O2, was synthesized as part of a series of benzoxadiazole analogs which were examined for fluorescent properties by Cu-catalysed azide–alkyne cyclo­addition (CuAAC) of a 4-azido­methyl-benzoxadiazole substrate. The structure shows a nearly coplanar orientation of the hexa­none keto group and the 1,2,3-triazole ring [dihedral angle = 4.3 (3)°], while the benzoxadiazole and triazole groups are much more severely inclined [dihedral angle = 70.87 (4)°]. In the crystal, weak C—H...N inter­actions connect translationally-related triazole rings, while another set of C—H...N inter­actions is formed between inversion-related benzoxadiazole units, forming a three-dimensional network. The crystal studied was a non-merohedral twin with refined value of the twin fraction of 0.2289 (16).
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