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Dual mode detection of CN- & Cu2+ using fluorene moiety with logic gate, DFT studies and real sample analysis
Ganesan Punithakumari1, Sivan Velmathi2
1Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India.
Abstract:
A simple colorimetric receptor was synthesized by the condensation of 2-amino fluorene with 2-hydroxy-5-nitrobenzaldehyde and its properties were investigated using colorimetric, fluorescence and DFT studies. The sensing mechanism was ascertained by 1H NMR titration studies. The synthesized receptor showed two-pronged chemosensing properties and exhibited remarkable colorimetric transitions from colorless to yellow in the presence of CN- and colorless to green in the presence of Cu2+ in 80:20 acetonitrile/water medium, which could be determined by naked eye observations. The detection limit of receptor to CN- and Cu2+ ion was found to be 7.9 × 10-7 M and 4.5 × 10-8 M respectively. Receptor was also successfully employed in the construction of molecular INHIBIT and YES logic gates. The synthesized receptor was also efficiently used for real-sample analysis in Finger Millet, also known as Ragi in Tamil. Its scientific name is Eleusine coracana.
