# 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

Kumar, Amarendra V and Venkatesan, K (1993) 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. In: Acta Crystallographica, Section B: Structural Science, 49 (5). pp. 896-900.

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## Abstract

(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.

Item Type: Journal Article Copyright for this article belongs to the International Union of Crystallography. Division of Chemical Sciences > Organic Chemistry 27 Jun 2008 19 Sep 2010 04:46 http://eprints.iisc.ernet.in/id/eprint/14658