article · Journal of Fluorescence
This research investigates the photophysical properties of the dye Janus Green B across different solvent environments and examines how it interacts with silver nanoparticles. By analysing absorption and fluorescence spectra through mathematical models such as the Lippert-Mataga, Billot, and Ravi equations, ground-state and excited-state dipole moments were determined. The excited-state dipole moments showed an increase, indicating that the dye undergoes electronic structural changes when excited. Measurements of fluorescence quantum yield demonstrated that the surrounding molecular environment directly influences emission behaviour. Specifically, the dye displayed distinct sensitivity to the presence of silver nanoparticles, pointing to potential interactions between them. Theoretical calculations using Time-Dependent Density Functional Theory provided simulations of electron density, electrostatic potential, and energy gaps, confirming and explaining the electronic transitions and experimental findings.
Understanding how light-absorbing dyes behave in different environments and interact with metal nanoparticles is fundamental to molecular chemistry. This study clarifies how solvent polarity and nanomaterials modify the light emission of Janus Green B, combining laboratory spectral measurements with computational modeling to map out the underlying electronic behaviour.
The abstract does not indicate an application pathway, as it reports early-stage fundamental research into molecular photophysics and nanoparticle interactions without citing specific real-world products, users, or development stages.
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Abstract This work explores the effects of solvent polarity on Janus Green B (JGB) photophysical properties. The Lippert-Mataga, Billot, and Ravi equations were utilized to calculate the singlet-state excited dipole moments (µ e ) and ground state dipole moments (µ g ) using absorption and fluorescence spectra analyses. The results showed an increase in the former, which is suggestive of electronic structural alterations upon excitation. Analysis of fluorescence quantum yield values revealed that JGB’s environment had an impact on its emission characteristics; it was particularly sensitive to silver nanoparticles, suggesting possible interactions. While simulations of electron density, electrostatic potential, and energy gap (E g ) helped to understand the electronic structure of JGB, theoretical absorption spectra produced by Time Dependent Density Function Theory (TD-DFT) calculations offered insights into electronic transitions during absorption. To sum up, the present study contributes to our comprehension of the molecular behavior of JGB in various solvents by elucidating the intricate relationship among solvent polarity, molecular environment, and interactions with silver nanoparticles. Additionally, theoretical computations support the interpretation of experimental results.
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DOI: 10.1007/s10895-024-03723-8
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