Abstract
To explore the possible impact of 2-Phenylbenzimidazole-5-sulfonic acid (PBSA) on the function of a sunscreen, in this work we investigate the binding of copper metal ions (Cu2+) to PBSA. Due to the existence of an intrinsic interaction phenomenon between Cu2+ ions and PBSA molecules, the photoluminescence (PL) quenching arises owing to the charge transfer from PBSA to Cu2+ ions. The mechanism of fluorescence quenching is probed experimentally following excitation at 306 nm by evaluating various quenching parameters with the help of the Stern–Volmer plot. Through the assessment of the values of the Stern–Volmer constant (\({K}_{SV}=45.2 {M}^{-1}\)) and bimolecular quenching rate constant (\({k}_{q}=0.77\times {10}^{10} {M}^{-1}.{s}^{-1}\)), it is deduced that the dynamic mode of PL quenching is operative between PBSA and Cu2+ ions. We evaluate the number of binding sites (n = 1) that advocate the presence of a single binding site in PBSA for Cu2+ ions. The numerical value of standard Gibbs free energy change, \({\Delta G}^{o}\) ~ -27.485 kJ.mol−1 implies the spontaneous binding between Cu2+ ions and PBSA molecules. The results obtained give an insight into the mechanism of metal-induced PL quenching of water soluble PBSA sunscreen.
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References
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Acknowledgements
The authors are highly thankful for the financial support of Higher Education Commission (HEC) Pakistan through the equipment/research grants 6976/Federal/NRPU/R&D/HEC/2017 and 20-3071/NRPU/R&D/HEC/13.
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Higher Education Commision, Pakistan, 20 3071/NRPU/R&D/HEC/13.
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All authors contribute to the study of conception and design. Muhammad Mubeen performed the experiments and wrote the initial draft of the manuscript. Muhammad Adnan Khalid, Maria Mukhtar, Poshmal Sumreen, Mamoona Tabassum, Shoaib Ashiq Butt, and Sheikh Aadil Abbas helped to conduct the experiments and data acquisition. Raheel Akram commented on the manuscript and revised it. Azhar Iqbal perceived the idea, acquired the funding, and supervised the work and writing of the manuscript.
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Mubeen, M., Khalid, M.A., Mukhtar, M. et al. Elucidating the Mechanism of Copper-Induced Photoluminescence Quenching in 2-Phenylbenzimidazole-5-Sulfonic Acid. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03704-x
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DOI: https://doi.org/10.1007/s10895-024-03704-x