Abstract
Two novel fluorescein based dipyromethane probes DPM1 and DPM2 were constructed from a simple and easily accessible fluorescein dye, and were fully characterized by means of standard spectroscopic techniques. Studies of the DPM1 and DPM2, investigated using UV–vis spectroscopy with different anions in CH3CN/DMSO, displayed selective colorimetric sensing towards fluoride, acetate and phosphate anions. Moreover, the fluorescence analysis was also accomplished with DPM1/DPM2, revealing the enhancement in the emission spectra of the fluoride, acetate and phosphate anions. From the studies, we noticed that the DPM1/DPM2 having spirolactone ring is non-fluorescent, which upon addition of the fluoride, phosphate and acetate, underwent ring-opening, resulting in the generation of strong fluorescence. The solid state images divulges that DPM1 shows green fluorescence and DPM2 displayed dark green fluorescence upon irradiating with UV-light of wavelength 254 nm. We infer that such types of naked eye sensors might reveal the potential applications in the selective and sensitive detection of fluoride/acetate/phosphate, and/or other biologically significant anions in nearby future.
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