(E)-2-Isopropylidene-3-(1-naphthylmethylene)succinic anhydride, {C_{18}H_{14}O_3}, {M_r = 278.31} monoclinic, {P2_1/c}, a = 13.408(1), b = 8.762(1), $c = 13.431(1) \AA$, $\beta = 117.50(1)^0$ {V = 1399.5(3) \AA^3}; Z = 4, {D_m = 1.32}, {D_x = 1.321 Mg m^{-3}} Cu $K\alpha$, $\lambda = 1.5418 \AA$ $\mu = 0.69 mm^{-1}$, F(000) = 584, T = 298 K; R = 0.057 for 1777 reflections. The electrocyclic ring closure that the title compound undergoes in the solid state is viewed in terms of relevant geometrical parameters. The photochromism of the compound observed in the solid state appears to occur at defect sites, surfaces and microcavities.

Photochromism in (E)-2-isopropylidene-3-(1-naphthylmethylene)succinic anhydride occurs at defect sites, surfaces, and microcavities in the solid state, with the electrocyclic ring closure occurring at defect sites,

Acta Crystallographica Section B-structural Science

Studies on photochromism of a thermally stable fulgide in the crystalline state: X-ray crystallographic investigation of (E)-2-isopropylidene-3-(1-naphthylmethylene)succinic anhydride

Studies on photochromism of a thermally stable fulgide in the crystalline state: X-ray crystallographic investigation of (E)-2-isopropylidene-3-(1-naphthylmethylene)succinic anhydride

Key Takeaway: Photochromism in (E)-2-isopropylidene-3-(1-naphthylmethylene)succinic anhydride occurs at defect sites, surfaces, and microcavities in the solid state, with the electrocyclic ring closure occurring at defect sites,