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Acta Cryst. (2013). E69, o665
[ doi:10.1107/S1600536813008799 ]

2-Methyl-3-(10H-phenothiazin-10-yl)buta-1,3-diene-1,1,4,4-tetracarbonitrile

T. Okuno and H. Iwahashi

Abstract: In the title compound, C21H11N5S, the phenothiazine unit has a butterfly structure, and the central six-membered ring adopts a boat conformation. The dihedral angle between the benzene rings is 127.64 (6)°, which is smaller than those reported for similar compounds because of the steric repulsion between the phenothiazine and its tetracyano-1,3-butadiene substituent. The dicyanovinyl groups are almost orthogonal to one another, making a dihedral angle of 80.58 (6)°. In the crystal, the molecules are aligned along the b axis. Four kinds of weak C-H...N interactions are recognized, one of which connects the molecules into a one-dimensional array and the remaining three link these arrays.


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