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A novel pH probe based on ratiometric fluorescent properties of dicyanomethylene-4H-chromene platform.
- Source :
-
Talanta . Nov2017, Vol. 174, p59-63. 5p. - Publication Year :
- 2017
-
Abstract
- 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 138 nm). The probe was stable in the studied solvent and no obvious fluorescence changes were detected in acidic media within one month at room temperature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00399140
- Volume :
- 174
- Database :
- Academic Search Index
- Journal :
- Talanta
- Publication Type :
- Academic Journal
- Accession number :
- 124248555
- Full Text :
- https://doi.org/10.1016/j.talanta.2017.05.034