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A novel biindenylidenedione compound, [2,2 -bi-1H-indene]-3,3 -bis [(4-oxo-4-ferrocenylbutanoyloxy)propyl]-3,3dihydroxy-1,1 -dione was synthesized and characterized fully by 1 H NMR, IR, MS and elemental analysis. The photochromic and photo-induced radical properties were investigated by means of UV-vis and electron spin resonance spectroscopy, respectively. The results show that the title compound simultaneously exhibits photochromism in the solid state as well as generating stable free radicals under irradiation with 330 nm light. This fact provides evidence for the photochromic mechanism of this kind of compounds.

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A series of new bis{3-[alkyl/(p-alkoxyphenyl)]-3-hydroxyindan-1-on-2-ylidene} derivatives 1-6 were prepared and characterized fully by 1 H NMR, IR, MS and elemental analysis data. The structures of compounds 1, 5and 6 were confirmed by the single-crystal X-ray diffraction. The photochromic and light-induced properties were examined by means of UV-Vis and electron spin resonance (ESR) spectroscopy methods, respectively. The results show that all the title compounds in this work simultaneously exhibit photochromism in solid state and generate stable free radicals under irradiation with a 200 W high pressure Hg-lamp. Structure-property relationship within these photochromic compounds was discussed in the context of their molecular structures and intra-molecular interactions.

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