Abstract
The Optical properties of the FBTC (1-((4-((5-chlorobenzo[d]oxazol-2-ylthio)methyl)-1H-1,2,3-triazol-1-yl)methyl)-3H-benzo[f]chromen-3-one) molecule were studied experimentally and theoretically. The spectra of absorption and fluorescence were recorded in various solvents to explore their Solvatochromic behavior and dipole moment at room temperature. To determine the ground and excited state of dipole moment experimentally and theoretically, we employed different Solvatochromic techniques, including microscopic solvent polarity functions developed by Lippert, Bakhshiev, Kawaski-Chamma-Viallet, and Reichardt’s, as well as density functional theory (DFT) and time-dependent density functional theory (TD-DFT) methods. The stability of the excited state dipole moment in FBTC is higher. Using prime functional, FBTC was optimized in its ground state, and its HOMO (Highest Occupied Molecular Orbital) and LUMO (Lowest Unoccupied Molecular Orbital), energies were estimated. These values were then compared with those obtained through cyclic voltammetry. Based on the HOMO and LUMO values given, we calculated the global reactivity parameter and energy gap, which was found to be low at 3.77 eV. This study also includes an estimation of electron absorption energies and oscillator strength. Natural population analysis (NPA), Milliken atomic charge, and molecular electrostatic potential (MESP) map are correlated. In addition, FBTC exhibited exceptional physiological temperature sensing behaviour from 20 °C -65 °C with high relative sensitivity and firm stability. Hence these results confirm that FBTC is a potential candidate for photonic devices and it’s also applicable in optical temperature sensing.
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Acknowledgements
One of the authors gratefully acknowledge the financial support from the NFPwD, National Fellowship for Person with Disabilities, Department of Empowerment of Person with Disabilities, (candidate ID – NFPWD-2021-22-KAR-10224 Dated:23/11/2022). The authors also express their gratitude to the authorities of USIC, KUD, for providing the instrumental resources utilized in this research endeavour.
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The study's conceptions and design were a collaborative effort by all the authors. Bi Bi Ayisha Mulla performed the sample preparation, data collection, and formal analysis, while Dr. Aravind R Nesargi and Prof. Ravindra R Kamble synthesized the materials. Bi Bi Ayisha Mulla also wrote the first draft of the manuscript, Dr. Mussuvir Pasha K M handled the computational work. Prof. Ashok H Sidarai oversaw the editing and review of the draft. All authors have read and given their approval for the final manuscript.
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Highlights
• The fluorescence quantum yield for FBTC was calculated.
• Bathochromic shifts were observed, attributed to the π-π* transition.
• FBTC is more polar in the excited state than the ground state.
• Experimental and theoretical HOMO LUMO energy values are close to each other.
• FBTC exhibited a remarkable relative sensitivity of about 1.35% ℃−1.
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Mulla, B.B.A., Nesaragi, A.R., M, M.P.K. et al. Exploration of Coumarin Derivative: Experimental and Computational Modeling for Dipole Moment Estimation and Thermal Sensing Application. J Fluoresc (2023). https://doi.org/10.1007/s10895-023-03364-3
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DOI: https://doi.org/10.1007/s10895-023-03364-3