Benzimidazo[2,1-a]benz[de]isoquinoline-7-one-12-carboxylic acid based fluorescent sensors for pH and Fe3+
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We synthesized two new probers which have similar structures, however their optical properties are very great differences.

The structure of the sensor boldFont">L1 is original for the detection of pH and Fe3+ simultaneously.

A new structure formed from compound boldFont">L2 upon acidification and result in the generation of the isosbestic point.

We have proved the structure change of boldFont">L2 upon acidification by absorption spectra, 1H NMR and DFT/TDDFT calculation.

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