3 years ago

A novel pH probe based on ratiometric fluorescent properties of dicyanomethylene-4H-chromene platform

A novel pH probe based on ratiometric fluorescent properties of dicyanomethylene-4H-chromene platform
We report here a ratiometric pH probe (Z)−2-(2-(2-(4-hydroxyphenyl)−2-(pyrrolidin-1-yl)vinyl) −4H-chromen-4-ylidene)-malononitrile over the pH range of 2.44–6.00. It was synthesized by Knoevenagel Reaction from dicyanomethylene-4H-chromene and pyrrolidine. This is the first example of pyrrolidine as a part of the product structure in Knoevenagel condensation. High selectivity and sensitivity for pH variation were observed with significant fluorescent ratiometric responses and a remarkable Stokes shift (about 138nm). The probe was stable in the studied solvent and no obvious fluorescence changes were detected in acidic media within one month at room temperature.

Publisher URL: www.sciencedirect.com/science

DOI: S0039914017305519

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