The title compound 2 (C30H27N3O, Mr = 445.55) has been synthesized and its structure was determined by X-ray crystallography method. The crystal is of monoclinic, space group P21/c with a = 17.520(15), b = 8.640(7), c = 15.439(13) (A), ( = 98.642(14)(, V = 2310(3) (A)3, Dc = 1.281 g/cm3, ( = 0.780 mm(1, F(000) = 944, Z = 4, the final R = 0.0671 and wR = 0.1790 for 1952 observed reflections with Ⅰ ＞ 2σ(Ⅰ). X-ray analysis revealed that the interatomic distance of C(20)(O(1) is 1.464(4) (A), longer than that of the normal C(O bond (1.41～1.43(A)) in the six-membered heterocycle, but this kind of change coincides with other spiro compounds. The six-membered heterocycle containing spiro Csp3(O is nonplanar. The UV-vis spectra of the title compound in polymer films showed that it exhibits excellent photochromic property.
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