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(a) 2-H in cyclohexane with its (b) absorption spectrum and photoluminescence spectra under air and N2 gas and (c) phosphorescence excitation spectra at 50 μM and 2.6 μM (λem = 575 nm). (d–f) 2-Br with its corresponding absorption/photoluminescence spectra (λex = 370 nm, 50 μM) and phosphorescence excitation spectrum (λem = 600 nm, 50 μM). (g) Time-dependent photoluminescence decays for 2-H and (h) 2-Br in deoxygenated cyclohexane at 50 μM.
