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Naphthaldehyde-Based Schiff Base Chemosensor for the Dual Sensing of Cu2+ and Ni2+ Ions

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Abstract

In this study, a simple Schiff base sensor 1-(((4-nitrophenyl)imino)methyl)naphthalen-2-ol(NNM) has been used for chemosensing of metal ions. The metal sensing properties of sensor NNM have been investigated using UV-visible and fluorescence spectroscopic approaches. The spectral investigations revealed a red shift in absorption spectra and quenching in the emission band of the ligand molecule in the presence of Cu2+ and Ni2+ ions. The binding stoichiometry of sensor NNM for the analyte (Cu2+ and Ni2+ ions) has been investigated by the Job’s plot analysis and found to be 1:1 (NNM:Analyte). The data of the Benesi-Hildebrand plot demonstrated that NNM detected Cu2+ and Ni2+ ions in nanomolar quantity. The binding insights among NNM and analytes (Cu2+ and Ni2+ ions) have been confirmed by shifted IR signals. Moreover, the reusabilty of the sensor has been investigated using an EDTA solution. In addition, the sensor NNM also successfully applied to real water samples for the identification and measurement of Cu2+ and Ni2+ ions. Hence, this system could be highly applicable in environmental and biological applications.

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Acknowledgments

The authors are thankful to the Department of chemistry, Baba Mastnath University, Asthal Bohar, Rohtak and the Department of chemistry, Kurukshetra University, Kurukshetra (India), for providing spectral facilities, including NMR spectroscopy.

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Original draft preparation, writing, methodology by Jasbir Singh and Pallavi Bhardwaj. Formal analysis, review and editing by Ravish K. Chauhan. Formal analysis, data interpretation by Brij Mohan and Ashwani Kumar.

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Correspondence to Pallavi Bhardwaj or Ravish K Chauhan.

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Singh, J., Mohan, B., Kumar, A. et al. Naphthaldehyde-Based Schiff Base Chemosensor for the Dual Sensing of Cu2+ and Ni2+ Ions. J Fluoresc 34, 149–157 (2024). https://doi.org/10.1007/s10895-023-03245-9

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