Solvatochromic and Fluorescence Behavior of Sulfisoxazole |
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Authors: | Abdulilah Dawoud Bani-Yaseen |
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Institution: | (1) Department of Chemistry, Faculty of Science, Taibah University, Al-MAdinah Al-Munawarah, P.O. Box 30002, Kingdom of Saudi Arabia |
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Abstract: | The Fluorescence spectroscopic and solvatochromic behavior of Sulfisoxazole, a sulfa drug with antimicrobial activities, in
various pure solvents of different polarity and hydrogen bonding capability is reported. The fluorescence emission spectrum
of sulfisoxazole was found to be solvent polarity dependent, where a notable red shift in emission maximum was observed with
increasing solvent polarity as well as hydrogen bonding capability. The effects of the latter two solvent parameters were
quantitatively investigated using the methods of Lippert–Mataga and solvatochromic comparison method (SCM) that is based on
the Kamlet-Taft equation. Particularly, the Lippert–Mataga method was applied to estimate the dipole moment of the excited
state (μe) upon plotting Stokes shift versus solvent polarizability (Δf), where a value of 11.54 Debye was obtained. On the other hand, applying the multiple regression analysis to the SCM method
revealed that solvent polarizability (π*) and hydrogen-bond donor capability (α) approximately equally stabilize sulfisoxazole
in the excited state with minor destabilization contribution by the hydrogen-bond acceptor capability (β). These findings
revealed that the excited state of sulfisoxazole is stabilized by polar solvents, indicating that this drug molecules exhibit
larger dipole moment in the excited state than in the ground state, which in turn implies that a potential intramolecular
charge transfer (ICT) occurs after excitation. |
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