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In the crystal structure of the title compound, C22H18NO2+·CF3SO3, adjacent cations are linked through C—H...π and π–π inter­actions, and the cations and anions are connected by C—H...O and C—F...π inter­actions. The acridine and benzene ring systems are oriented at a dihedral angle of 3.0 (1)°. The carboxyl group is twisted at an angle of 83.1 (1)° relative to the acridine skeleton. The mean planes of adjacent acridine units are parallel or inclined at an angle of 75.2 (1)° in the crystal structure.

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In the crystal structure of the title compound, C21H15BrNO2+·CF3SO3, the cations form inversion dimers through π–π inter­actions between the acridine ring systems. These dimers are further linked by C—H...π and C—Br...π inter­actions. The cations and anions are connected by multidirectional C—H...O and C—F...π inter­actions. The acridine and benzene ring systems are oriented at 10.8 (1)°. The carboxyl group is twisted at an angle of 85.2 (1)° relative to the acridine skeleton. The mean planes of adjacent acridine units are parallel or almost parallel [inclined at an angle of 1.4 (1)°] in the crystal structure.
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