Abstract
Nature has gifted us many organic molecules which have remarkable influence in our daily life. Amongst many organic molecules, heterocyclic organic molecules have gained potential applications in the advanced field of biomedicine, pharmaceutical, electronics and many more. In the present work fluorescence quenching of biologically active fluorescent probe 8EMOHCC by aniline in different solvents have been studied at room temperature. To understand the molecular behaviour in different media, solvents of different refractive index and dielectric constant have been used. Spectroscopic measurement techniques such as UV/Vis spectroscopy and time related single photon counting are employed to characterise the molecule at room temperature. The fluorescence quenching study shows linear dependence of SV-plot in solvents of different dielectric constants. It reveals that quenching reactions are dynamic in nature. Various parameters of quenching have been determined and identified the type of quenching involved in the quenching reaction. Further, kq is found to be greater than \( {k}_q^{\prime } \) in ACN, methanol, propanol and dioxane. Activation energy of quenching (Ea) is found to be greater than energy of diffusion (Ed) in ACN, methanol, propanol, THF solvents and Ed > Ea in dioxane, indicating that quenching reaction is not solely controlled by material diffusion but also activation process.
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Acknowledgements
This research work is supported by KLE Technological University under “Capacity Building Projects” grants. The author V. V. Koppal thanks the Management, KLE Society Belgaum for financial support. The author Raveendra Melavanki acknowledges the Principal, MSRIT and the Management, Gokul Education Society for encouragement.
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The Authors have no major funding from any scientific agencies but we have funded by institute as Capacity Building Fund to meet out the expenses to purchase materials and various measurements.
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V. V. Koppal: Performed Experimental part and prepared manuscript.
Raveendra Melavanki: Contributed valuable discussions to the results and discussions.
Raviraj Kusanur: Synthesis of title molecule and helped in the analysis of NMR Spectra.
N R Patil: Corrected the Experimental part and manuscript.
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This to certify that the article entitled “Analysis of fluorescence quenching of coumarin derivative under steady state and transient state methods” submitted by V.V. Koppal et al., for the publication in Journal of Fluorescence is based on the original work and results of the experiments were carried out by all authors under my supervision. No part of the article has been previously submitted for the publication in any journals. There are no any issues of conflict of authors of the manuscript.
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Koppal, V.V., Melavanki, R., Kusanur, R. et al. Analysis of Fluorescence Quenching of Coumarin Derivative under Steady State and Transient State Methods. J Fluoresc 31, 393–400 (2021). https://doi.org/10.1007/s10895-020-02663-3
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DOI: https://doi.org/10.1007/s10895-020-02663-3