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Temperature-responsive absorption and emission properties of M1 in DMF recorded between −20 and 70 °C (λex = 400 nm; c = 2.0 μM; 10 °C temperature intervals). (a) absorption spectral changes. (b) Emission spectral changes. The inset shows the image of the solution under UV illumination (365 nm) at −20 and 70 °C, respectively. (c) Temperature dependence of the emission intensity at 530 nm (I530) and 460 nm (I460) and the ratio between I460 and I530.
