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In the title molecule, C21H18N2S2, the C=N—N angle of 117.6 (2)° is significantly smaller than the ideal value of 120° expected for sp2-hybridized N atoms. This is probably a consequence of repulsion between the nitrogen lone pairs and the adjacent N atom, as suggested in Zheng, Qiu, Lin & Liu [Acta Cryst. (2006), E62, o1913–o1914]. The two neighbouring benzene rings form a dihedral angle of 75.95 (3)° with each other, while subtending dihedral angles of 84.18 (3) and 8.44 (2)° with the third ring in the structure.