Abstract
A series of diaryl-substituted [5]helicene derivatives containing aromatic imide moiety were effectively synthesized. From the single crystal of 3, obviously helical structure with a torsion angle of 65.4° was detected. Compared with their tetrahydro[5]helicene analogues, the [5]helicene derivatives showed longer absorption wavelength and larger molar absorptivity, which might be attributed to the large π-conjugated skeleton that was beneficial to electron delocalization at ground state. Moreover, except for 5k, long emission wavelength (520–545nm), medium fluorescence quantum yields (14.4–21.6%) and large Stokes shifts (89–95nm) of the [5]helicene derivatives were also found, which could make them be found wide potential applications in optoelectronic materials.
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