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Time-dependent enhancement of emission intensity (λem, 390 nm) for 1 in acetonitrile–water (40:60 v/v) mixture upon exposure to visible light (excitation wavelength 330 nm). Concentration of 1 = 1.16 × 10–4 M. The inset displays the emission spectrum of free pbt ligand (concentration = 1.16 × 10–4 M).
