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New pH‐sensitive perylene bisimide indicator dyes were synthesized and used for fabrication of optical sensors. The highly photostable dyes show absorption/emission bands in the red/near‐infrared (NIR) region of the electromagnetic spectrum, high molar absorption coefficients (up to 100 000 m−1 cm−1), and fluorescence quantum yields close to unity. The absorption and emission spectra show strong bathochromic...
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