Fig. 6: Photophysical property investigations.

a Normalized UV–Vis absorption spectra and fluorescence emission spectra of 45, 50, 58, and 61 in DCM (λex = 350 nm, c = 1.0 × 10−5 M). The corresponding photographs showing their luminescence behavior in DCM under 365 nm UV light irradiation. b Normalized UV–vis absorption spectra and fluorescence emission spectra of 28, 38, 72, and 73 in DCM (λex = 330 nm, c = 1.0 × 10−5 M). The corresponding photographs showing their luminescence behaviour in DCM under 365 nm UV light irradiation. c CD spectra of 45, 50, 58, and 61 in DCM solution (c = 1 × 10–5 M). d gabs-wavelength curves of 45, 50, 58, and 61 in DCM. e CD spectra of 28, 38, 72, and 73 in DCM solution (c = 1 × 10–5 M). f gabs-wavelength curves of 28, 38, 72, and 73 in DCM.