4-methouybenzaldehyde pentafluorophenyl-methylidenehydrazone

The crystal structure of the mixed azine C15H9F5N2O is described. The molec ule has a high degree of planarity, The two phenyl rings deviate from perfe ct planarity by less than 2 degrees and the dihedral angles between the ips o-C atoms and the azine bridge also show a minute deviation from planarity of less than 2 degrees. The only dihedral angle that indicates any signific ant twisting is the dihedral angle about the azine bridge [C1-N1-N2-C8 174. 8(6)degrees], and even this one is relatively small. Face-to-face arene-are ne contacts are the dominant intermolecular interactions, There are double face-to-face contacts in which the two phenyl rings of one mixed azine inte ract with the two phenyl rings of another mixed azine, There are also singl e face-to-face contacts where one phenyl ring of one mixed azine interacts with a phenyl ring of another mixed azine, In the double face-to-face arene -arene contacts, the pentafluorinated phenyl ring of one mixed azine always interacts with the methoxy-substituted phenyl ring of another mixed azine. In the single face-to-face arene-arene contacts, the interactions are alwa ys between two pentafluorinated phenyl rings or two methoxy-substituted phe nyl rings.