Abstract
Some novel hybridized 1,3-diazabicyclo[3.1.0]hex-3-ene with tri, and tetraarylimidazole for the first time were synthesized. The photochromic hybrids exhibited good photochromic properties with notable fatigue resistance in both solution and solid states. In the solid state, the hybrids with a NO2 group in the para position displayed multi-color changes under irradiation with alternative UV and visible light. The photochromic mechanism was proposed that photoisomerization between their enol-closed ring, keto-open ring and enol-open ring photoisomers was induced under irradiation with alternative UV and visible light. Furthermore, patterns were successfully visualized upon UV-light irradiation, which suggested that these compounds can be served as a security ink or an anti-counterfeiting mark for photoprinting.
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