Fig. 5. ns-TRE spectra of (a) 1a and (b) 3a in 77 K glassy solution (EtOH/MeOH = 4 : 1) recorded at different time intervals. λ exc = 355 nm; integration time: 80 and 200 μs for 1a and 3a, respectively. Insets of (a) and (b) show the kinetic decay traces at the specified wavelengths with the estimated phosphorescence lifetime (τ phos).
