Reinvestigation of the photophysics of 3-aminobenzoic acid in neat and mixed binary solvents

Husain, Shahid; Mehata, Mohan Singh; Pandey, Nupur; Mishra, Hirdyesh; Pant, Sanjay

doi:10.1016/j.saa.2020.119100

Cited by 6 publications

(1 citation statement)

References 62 publications

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“…The local mole fraction of the polar component, x P L , is more than the bulk value due to PS (Tables ST2 and ST3). These are calculated from observed spectral parameters using an established simple model (note SN2) − Here, ṽ em max ( x P ), ṽ em max (N), and ṽ em max (N) are emission maxima in the solvent mixture, the neat polar solvent, and the neat nonpolar solvent, respectively. δ P = x P L – x P , and the value of x P at which its maximum occurs is the measure of the extent of specific interactions .…”

Section: Resultsmentioning

confidence: 99%

The Role of Hydrogen Bonding in the Preferential Solvation of 5-Aminoquinoline in Binary Solvent Mixtures

et al. 2021

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5-Aminoquinoline (5AQ) has been used as a fluorescent probe of preferential solvation (PS) in binary solvent mixtures in which the nonpolar component is diethyl ether and the polar component is protic (methanol) or aprotic (acetonitrile). Hence, the roles of solvent polarity and solute−solvent hydrogen bonding have been delineated. Positive deviations of spectral shifts from a linear dependence on the concentration of the polar component, signifying PS, are markedly more pronounced in case of the protic solvent. Solvation dynamics on a nanosecond time scale mark the formation of the solvation shell around the fluorescent probe. Time-resolved area-normalized emission spectra indicate the occurrence of the continuous solvation of the excited state when the polar component is acetonitrile. In contrast, two distinct states were observed when the polar component was methanol, the second state being the hydrogen bonded one. Translational diffusion is the rate-determining step for formation of the solvation shell. The time constant associated with it has been estimated from rise times observed in fluorescence transients monitored at the red end of the fluorescence spectra and also from the time evolution of the spectral width of time-resolved emission spectra.

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