Abstract
A variety of new coumarin derivatives containing C-4 bridged 2,6-dicyanoanilines (4a-4d) were synthesized via multicomponent one pot approach. These novel sensors were characterized by spectral analysis and a series of pH sensing fluorescence studies were performed, the results indicating that the sensors are highly selective and more effective at various pH. The fluorescence colour changes at different pH could be directly detected by naked eyes.
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Acknowledgements
We acknowledge the University Grant Commission (UGC) and also UGC-UPE New Delhi, for the financial support. Authors also thank NMR Research Center, Indian Institute of Science (I.I.Sc.), Bangalore and University Sophisticated Instrumentation Center, Dharwad (USIC) for spectral analysis. One of the authors Rashmi C. Kulkarni expresses her gratitude towards Lohit Naik for his advice and insights.
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Kulkarni, R.C., Samundeeswari, S., Shaikh, F. et al. Synthesis of Naked-eye Detectable Fluorescent 2H-chromen-2-One 2, 6-Dicyanoanilines: Effect of Substituents and pH on Its Luminous Behavior. J Fluoresc 27, 1613–1619 (2017). https://doi.org/10.1007/s10895-017-2098-y
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DOI: https://doi.org/10.1007/s10895-017-2098-y