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A two-photon fluorescent probe (DMPCA) for the detection of bisulfite anion in water was developed based on twisted-intramolecular-charge-transfer (TICT) mechanism. Fluorescence intensity of DMPCA increased dramatically (65 fold) upon the addition of HSO3−. The two-photon absorption cross-section of DMPCA was found to be 725 GM at 700nm upon the addition of HSO3−. The fluorescent probe showed an excellent...
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