cqvip:The title compound 2,2-dithiophene-naphthopyran (C21H14OS2, Mr = 346.44) was synthesized and characterized by IR, 1H NMR, elemental analysis and single-crystal X-ray diffrac- tion. It belongs to the monoclinic system, space group P21/n, with a = 8.2349(14), b = 6.1964(11), c = 32.458(5) , β = 95.051(3)°, V = 1649.8(5) 3, Z = 4, Dc = 1.395 g/cm3, μ = 0.327 cm-1, F(000) = 720, the final R = 0.0559 and wR = 0.1442 for 3370 observed reflections (I > 2σ(I)). X-ray analysis revealed that the interatomic distance of C(13)-O(1) is 1.456(3) , longer than that of normal C-O bond (1.41～1.43) in a six-membered heterocycle. The UV-vis spectra of the title compound showed that it exhibits excellent photochromic property in polyester coating and solutions.
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