(2<i>E</i>)-2-[(2<i>E</i>)-3-Phenylprop-2-en-1-ylidene]-2,3-dihydro-1<i>H</i>-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 Å. The conformation about each of the C=C bonds [1.343 (3) and 1.349 (3) Å] is E. Supra-molecular layers in the bc plane, mediated by C-H⋯O and π-π [ring centroid-centroid distance = 3.5282 (15) Å] inter-actions, feature in the crystal packing.