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Improving Copper(II) Sensitivity by Combined use of AIEE Active and Inactive Schiff Bases

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Abstract

An aggregation-induced emission enhancement (AIEE) active Schiff base PNN was synthesized by condensing benzidine with 2-hydroxynaphthaldehyde. The green-fluorescent PNN (λem = 510 nm) in DMF turned to yellow-fluorescent PNN (λem = 557 nm) upon increasing the fractions of HEPES buffer (10 mM, pH 7.4) above 40%. The DLS study supports the self-aggregation of PNN that restricts the intramolecular rotation and activates the excited-state intramolecular proton transfer (ESIPT) process. The fluorescence emission of AIEE active PNN was quenched by Cu2+ with an estimated detection limit of 2.1 µM. Interestingly, the detection limit of PNN towards Cu2+ was improved in the presence of an AIEE inactive Schiff base PBPM obtained by reacting 1,4-diaminobenzene with pyridine-4-carbaldehyde. The mixed PNN-PBPM showed a detection limit of 0.49 µM. The practical utility of PNN-PBPM was validated by quantifying Cu2+ ions in real environmental water samples and green tea.

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All data generated during this study are included in this published article.

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Authors and Affiliations

  1. Department of Chemistry, Sardar Vallabhbhai National Institute Technology, Surat, 395007, Gujarat, India

    Kanishk Bhardwaj, Ritambhara Jangir & Suban K. Sahoo

  2. Department of Chemistry, Sathyabama Institute of Science and Technology, Chennai, 600119, India

    Thangaraj Anand

Authors
  1. Kanishk Bhardwaj
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  2. Thangaraj Anand
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  3. Ritambhara Jangir
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  4. Suban K. Sahoo
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Contributions

All authors contributed to the study. The Investigation, Validation, Formal analysis, Data curation, Writing – original draft were performed by Kanishk Bhardwaj. Thangaraj Anand and Ritambhara Jangir help in Writing – original draft. The Conceptualization, Resources, Supervision, and Writing- review & editing were performed by Suban K Sahoo.

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Correspondence to Suban K. Sahoo.

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Bhardwaj, K., Anand, T., Jangir, R. et al. Improving Copper(II) Sensitivity by Combined use of AIEE Active and Inactive Schiff Bases. J Fluoresc 34, 1065–1074 (2024). https://doi.org/10.1007/s10895-023-03347-4

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