“…Their photophysical properties are promising for laser dyes [ 9 , 10 , 11 ], molecular sensors [ 12 , 13 , 14 ], and solar cells [ 15 ]. Furthermore, numerous extended coumarin dyes have been synthesized, and the photophysical properties based on their rigid and planar structures have been described [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Conversely, unusual coumarin dyes with helical geometries have also been reported; these compounds represented a platform for the development of molecular chiral dopants [ 25 , 26 , 27 ].…”