Interaction of 6-methoxyquinoline with anionic sodium dodecylsulfate micelles: Photophysics and rotational relaxation dynamics at different pH

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Y Tej Varma, Debi D Pant

Abstract

Interactions of different species of 6-methoxyquinoline (6MQ) with anionic micelles have been studied at different pre-micellar, micellar and post-micellar concentrations using steady state, time resolved fluorescence and fluorescence anisotropy techniques. The sensitivity of fluorescence of 6MQ to change in its local environment was used to probe sodium dodecylsulfate (SDS) micelles. At post-micellar concentrations of SDS, the observed blue shift in the fluorescence spectrum and increase in quantum yield are attributed to the incorporation of solute molecule to micelles. 6MQ has been found to bind to the surface of the anionic micelles instead of penetrating inside the core of micelles. The binding constant (Kb) calculated for 6MQ revealed that the electrostatic forces mediate charged probe-micelle association, whereas, hydrophobic interaction allowed neutral 6MQ to associate with SDS micelles. The charged 6MQ gets inserted deeper into the micelle surface than its neutral form. The fluorescence anisotropy decay of 6MQ in SDS micelles studied at different pH allowed determination of restriction of motion of the fluorophore. The location of the probe molecule in micellar systems is justified by a variety of spectral parameters s...Continue Reading

References

Jul 21, 2006·The Journal of Physical Chemistry. B·Shrestha Basu Mallick, Albena Ivanisevic
Feb 24, 2007·Biomacromolecules·Alok ChakrabartyNitin Chattopadhyay
Mar 17, 2007·Journal of Colloid and Interface Science·T Sanjoy Singh, Sivaprasad Mitra
Mar 22, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Alok ChakrabartyNitin Chattopadhyay
Dec 2, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Y Tej VarmaDebi D Pant
Apr 13, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Sunita Joshi, Debi D Pant

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