2,6-Diiodo­phenyl acridine-9-carboxyl­ate

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 I...I and I...N contacts, are aligned in stacks along the a axis. These stacks, inter­acting through π–π contacts between benzene rings, are arranged in layers.