Dual mode detection of CN- & Cu2+ using fluorene moiety with logic gate, DFT studies and real sample analysis applications

Ganesan Punithakumari; Sivan Velmathi

doi:10.1016/j.saa.2019.117887

Dual mode detection of CN^- & Cu²⁺ using fluorene moiety with logic gate, DFT studies and real sample analysis applications

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Mar 15:229:117887. doi: 10.1016/j.saa.2019.117887. Epub 2019 Dec 2.

Authors

Ganesan Punithakumari¹, Sivan Velmathi²

Affiliations

¹ Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India.
² Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India.. Electronic address: velmathis@nitt.edu.

PMID: 31818646
DOI: 10.1016/j.saa.2019.117887

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.

Keywords: CN(−) & Cu(2+); Colorimetric; DFT; Logic gate; Near IR; Real sample.

MeSH terms

Anions
Cations
Copper / analysis*
Cyanides / analysis*
Density Functional Theory*
Fluorenes / chemistry*
Kinetics
Limit of Detection
Logic*
Molecular Conformation
Proton Magnetic Resonance Spectroscopy
Receptors, Artificial / chemistry
Spectrometry, Fluorescence

Substances

Anions
Cations
Cyanides
Fluorenes
Receptors, Artificial
fluorene
Copper