Viscosity effect on absorption and fluorescence spectra of a new functionalized amphiphilic analogue styryl pyridinium dye

Document Type : Research and Reference

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Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt

Abstract

The effect of temperature and viscosity on the absorption and fluorescence spectra of a new synthesized amphiphilic analogue styryl pyridinium dye namely 1-cetyl-4-[4-chloro-styryl]-pyridinium iodide (CCSP) in glycerol has been studied. There is no observable change in its absorption and fluorescence wavelength maximum, lmax, as the temperature changes between 7-65oC. The intensity of the absorption band or in other words the change in the value of molar extinction coefficient is related to the solution temperature.  In the excited state, change of the solution temperature affects the viscosity of the medium. Change of solution viscosity has a great effect on CCSP fluorescence intensity. Decrease of the glycerol solution viscosity induced by heating was accompanied by decrease in the fluorescence quantum yield. The relationship between the fluorescence intensity CCSP and the viscosity of the medium was determined by the Förster–Hoffmann equation to measure the sensitivity of the fluorescent probe towards the viscous medium, it is easy to consider CCSP to measure the sensitivity of the fluorescent probe towards the viscosity

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Delta Journal of Science
Volume 50, Issue 1
February 2025
Pages 97-105

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