Supra­molecular networks of 10-(2-hy­droxy­eth­yl)acridin-9(10H)-one and 10-(2-chloro­eth­yl)acridin-9(10H)-one

Both 10-(2-hy­droxy­eth­yl)acridin-9(10H)-one, C₁₅H₁₃NO₂, and 10-(2-chloro­eth­yl)acridin-9(10H)-one, C₁₅H₁₂ClNO, have mono­clinic (P2₁/c) symmetry and supra­molecular three-dimensional networks. But the differences in the inter­molecular inter­actions displayed by the hy­droxy group and the chlorine substituent lead to stronger inter­molecular [pi]-stack­ing inter­actions and hydrogen bonding, and hence a significantly higher melting point for the former.