(2E)-2-[(2E)-3-Phenyl-prop-2-en-1-yl-idene]-2,3-dihydro-1H-inden-1-one.

The title indan-1-one derivative, C(18)H(14)O, is planar with an r.m.s. deviation for all 19 non-H atoms of 0.098†à . The conformation about each of the C=C bonds [1.343†(3) and 1.349†(3)†à ] is E. Supra-molecular layers in the bc plane, mediated by C-H⋯O and π-π [ring centroid-centroid distance = 3.5282†(15)†à ] inter-actions, feature in the crystal packing.