Phthalimide at 120 K: perforated molecular ribbons containing three different ring motifs

Molecules of phthalimide [1H-isoindole-1,3(2H)-dione], C8H5NO2, are linked by N-H...O hydrogen bonds [H...O 2.02 A, N...O 2.8781 (16) A and N-H...O 167 degrees ] and by C-H...O hydrogen bonds [H...O 2.54 and 2.56 A, C...O 3.3874 (18) and 3.4628 (19) A, and C-H...O 149 and 159 degrees ] into molecular ribbons, which are pierced by three different ring motifs; there are two centrosymmetric R2(2)(8) rings, each containing a single hydrogen bond, N-H...O in one case and C-H...O in the other, and R2(2)(9) rings containing all three hydrogen bonds.