organic compounds
The crystal structure of dibrucinium sulfate(VI) heptahydrate, 2C23H27N2O4+·SO42−·7H2O, has been determined. The components are packed in layers. Puckered brucinium sheets are separated by layers consisting of hydrogen-bonded disordered sulfate(VI) anions and water molecules. Both layers, the cationic together with the anionic/water, are linked by N—H+O− and O—HO hydrogen bonds.
organic compounds
In the orthorhombic crystalline phase of the title compound, C20H11I2NO2, all the benzene rings are parallel, whereas the acridine systems are either parallel or perpendicular to each other; this generates a herring-bone pattern. The acridine systems and benzene rings are inclined at an angle of 45.5 (1)° to each other, and the acridine systems and carboxylate groups are inclined at an angle of 54.2 (1)°. Oppositely oriented consecutive molecules, with π–π interactions between their acridine systems and II and IN contacts, are aligned in stacks along the a axis. These stacks, interacting through π–π contacts between benzene rings, are arranged in layers.