Abstract
This research investigates the excimerisation of acriflavine dye in ethylene glycol and glycerol solvents. Acriflavine, a member of the acridine dye family, exhibits unique fluorescence properties with applications in various fields, including cellular nucleus observation, nucleic acid analysis, and dye laser active media etc. The study explores the impact of solvent and concentration on acriflavine's emission properties, with a focus on excimer formation, which can influence its suitability as a dye laser active medium. UV-Visible absorption spectroscopy reveals concentration-dependent absorption profiles, with distinctive monomer bands. Steady-state fluorescence studies demonstrate the emergence of red-shifted excimer fluorescence bands as concentrations increase in both solvents. Temperature-dependent fluorescence studies reveal the dynamics of excimer formation, suggesting dynamic diffusion as the excimerisation mechanism. Time-resolved fluorescence spectroscopy confirms the singlet character of both monomer and excimer states, providing insights into the excimerisation process. Critical concentration values are determined, representing the equilibrium between monomeric and excimeric forms. The study also explores pH-induced spectral shifts, highlighting the influence of acidity on fluorescence properties. Overall, this research deepens our understanding of acriflavine's excimerisation in ethylene glycol and glycerol, offering insights that can enhance its diverse applications, especially in laser technologies.
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The data generated and analysed during the present study are available from the corresponding author upon reasonable request.
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Acknowledgement
The authors thank the Science and Engineering Research Board, Department of Science and Technology, Government of India for the grant, No. CRG/2021/002942. Author SH wishes to thank FIST (DST) grant SR/FST/PSI-213/2016(C).
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This work was supported by the Science and Engineering Research Board, Department of Science and Technology, Government of India (Project No. CRG/2021/002942).
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Simanta Hazarika: Conceptualisation, Methodology, Investigation, Supervision, Formal Analysis, Visualisation, Writing-original Draft. Hiren Swargiary: Investigation, Formal Analysis, Visualisation, Writing-original Draft. Seikh Mustafa Radiul: Investigation, Formal Analysis, Visualisation, Writing-original Draft.
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Swargiary, H., Radiul, S.M. & Hazarika, S. Excimer Fluorescence of Acriflavine Dye in Glycerol and Ethylene Glycol. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03686-w
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DOI: https://doi.org/10.1007/s10895-024-03686-w