10-[(4-Nitrophenyl)ethynyl]-10H-phenothiazine

Abstract

The title compound, C20H12N2OS, is a 10-ethynyl-10H-phenothiazine derivative. The phenothiazine unit has a butterfly shape, where the folding angle between the two benzene rings is 153.87 (7)°, which is almost as in other reported phenothiazine derivatives. The dihedral angle between the mean plane including the C atoms bonded to the phenothiazine N atom and the benzene ring of the nitrobenzene group is 10.34 (5)°. The near planar geometry of the molecule is reasonably explained by intramolecular charge-transfer interactions.

Keywords

• crystal structure
• phenothiazine
• ynamine
• heterocycle conformation.