Fluoren-9-one oxime

Abstract

Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.029; wR factor = 0.075; data-to-parameter ratio = 13.9.In the title molecule, C 13 H 9 NO, the fluorene system and the oxime group non-H atoms are essentially coplanar, with a maximum deviation from the fluorene mean plane of 0.079 (2) Å for the oxime O atom. A short intramolecular C-HÁ Á ÁO generates an S(6) ring. In the crystal, molecules related by a twofold screw axis are connected by O-HÁ Á ÁN hydrogen bonds, forming [100] chains Within these chains, molecules related by a unit translation along [100] showstacking interactions between their fluorene ring systems with an interplanar distance of 3.347 (2) Å . The dihedral angle between the fluorene units of adjacent molecules along the helix is 88.40 (2) . There is a short C-HÁ Á Á contact between the fluorene groups belonging to neighbouring chains.