THE EFFECT OF DIMETHYLSULFOXIDE ON THE FLUORESCENCE PROPERTIES OF SOME 4-HYDROXYQUINOLINES

Authors

  • Karine R. Grigoryan Chair of Physical and Colloids Chemistry, YSU, Armenia
  • Hasmik A. Shilajyan Chair of Physical and Colloids Chemistry, YSU, Armenia
  • Iskuhi L. Aleksanyan Chair of Organic Chemistry, YSU, Armenia
  • Zara L. Grigoryan Chair of Physical and Colloids Chemistry, YSU, Armenia
  • Lilit P. Hambardzumyan Chair of Organic Chemistry, YSU, Armenia

DOI:

https://doi.org/10.46991/PYSU:B/2021.55.2.112

Keywords:

4-hydroxy-2-methylquinoline, 2-(5-mercapto-1,3,4-oxadiazol-2-yl)-6-methylquinoline-4-ol, fluorescence quantum yield, dimethylsulfoxide

Abstract

Fluorescence properties of 4-hydroxy-2-methylquinoline (1) and 2-(5-mercapto-1,3,4-oxadiazol-2-yl)-6-methylquinoline-4-ol (2) were studied in dimethylsulfoxide (DMSO) aqueous solutions. The fluorescence properties of 1 and 2 exhibit substantial dependence on the DMSO concentration. The fluorescence quantum yield $(\Phi_f)$ of 1 decreases upon adding DMSO due to the shift in the keto-enol (E) tautomeric equilibrium toward E form․ On the contrary 2 demonstrates a tendency of increase of $\Phi_f$ upon adding DMSO due to intermolecular charge transfer from DMSO to the aromatic ring of quinoline, which increases the electron density on the ring and hence the fluorescence efficiency.

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Published

2021-08-30

How to Cite

Grigoryan, Karine R., Hasmik A. Shilajyan, Iskuhi L. Aleksanyan, Zara L. Grigoryan, and Lilit P. Hambardzumyan. 2021. “THE EFFECT OF DIMETHYLSULFOXIDE ON THE FLUORESCENCE PROPERTIES OF SOME 4-HYDROXYQUINOLINES”. Proceedings of the YSU B: Chemical and Biological Sciences 55 (2 (255):112-17. https://doi.org/10.46991/PYSU:B/2021.55.2.112.

Issue

Vol. 55 No. 2 (255) (2021)

Section

Chemistry

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Copyright (c) 2021 Proceedings of the YSU

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