Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 9 (September 2012)

organic compounds

Acta Cryst. (2012). E68, o2756    [ doi:10.1107/S1600536812035994 ]

Ortho­rhom­bic polymorph of (2E)-2-(2,3-dihydro-1H-inden-1-yl­idene)-2,3-di­hydro-1H-inden-1-one

H. Li, F. R. Fronczek and S. F. Watkins

Abstract: The title compound, C18H14O, is polymorphic at 123 K. The ortho­rhom­bic form reported herein has two independent mol­ecules in the asymmetric unit, with mol­ecular volume 313.5 Å3. The previously reported triclinic (P-1) form [Raston & Scott (2000). Green Chem., 2, 49-52] has mol­ecular volume 309.6 Å3 at the same temperature. All three mol­ecules deviate significantly and systematically from the putative Cs symmetry ([delta]r.m.s. = 0.0265, 0.0256, 0.0497 Å). Comparison of the two molecules in the orthorhombic polymorph shows that 16 of the 19 equivalent pairs of framework atoms have a mirror-image pattern of deviations (above/below plane), suggesting that the two are quasi-enanti­omorphs. The pattern of deviations in the triclinic form is nearly the same (13 of 19 atom pairs) as the ortho­rhom­bic form.

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