organic compounds
Open access
In the crystal structure of the title compound, C15H11FO2, molecules form inversion dimers through pairs of weak C—HO hydrogen bonds. Dimers oriented in parallel, linked by C—Hπ contacts, are arranged in columns along the b axis. The fluorophenyl ring and the benzene ring of the 2H-chromen-4(3H)-one unit are inclined to one another by 70.41 (16)°. They are respectively parallel in a given column or almost perpendicular [oriented at an angle of 87.8 (1)°] in neighbouring (inversely oriented) columns, forming a herringbone pattern.
organic compounds
Open access
In the crystal structure of the title molecular salt, C21H15FNO2+·CF3SO3−·H2O, the cations form inversion dimers through π–π interactions between the acridine ring systems. These dimers are linked via C—HO and C—Fπ interactions to adjacent anions, and by C—Hπ and C—Fπ interactions to neighbouring cations. The water molecule links two sites of the cation by C—HO interactions and two adjacent anions by O—HO hydrogen bonds. The mean planes of the acridine and benzene ring systems are oriented at a dihedral angle of 15.1 (1)°. The carboxyl group is twisted at an angle of 84.5 (1)° relative to the acridine skeleton. The mean planes of the acridine ring systems are parallel in the crystal.
organic compounds
Open access
In the crystal structure of the title compound, C21H15BrNO2+·CF3SO3−, adjacent cations are linked through C—Brπ and π–π contacts [centroid–centroid distance = 3.744 (2) Å], and neighbouring cations and anions via C—HO, C—Fπ and S—Oπ interactions. The acridine and benzene ring systems are oriented at a dihedral angle of 18.7 (1)°. The carboxy group is twisted at an angle of 69.3 (1)° relative to the acridine skeleton. The mean planes of adjacent acridine moieties are either parallel or inclined at an angle of 27.8 (1)° in the lattice.