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A series of novel indeno[2,1-a]phenalene derivatives 4a–j including electron-donating or electron-withdrawing groups were prepared by Pd-catalyzed Sonogashira–Hagihara reaction of 7-iodo-12-phenylindeno[2,1-a]phenalene with various arylacetylene. Photoelectric properties of these compounds were investigated by UV–vis absorption and fluorescence. The fluorescent emission of 4d containing dimethyl amino...
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