Abstract:
The title compounds, C16H13NO2S, (I), and C21H15NO2S, (II), have similar molecular structures that differ only in the side groups attached to the S atom. The crystal packing is dominated by pi-pi stacking interactions, involving acridinedione-acridinedione overlap in (I) and both acridinedione-acridinedione and acridinedione-tolyl overlap in (II).