Journal of Surface Science and Technology

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Molecular Basis of the Binding of Dye to Polycations: Absorption and Emission Spectral Studies


Affiliations
1 Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India
     

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Absorption and emission spectral behaviour of an anionic xanthene dye, eosinY was investigated to perceive the nature and extent of interaction with three different cationic polyelectrolytes. The formation of dye-polymer aggregates was found to be associated with two types of interactive forces: electrostatic and hydrophobic forces. The binding constants and stoichiometry of the dye-polymer aggregates in their ground states were determined by suitably analyzing the absorption spectra by varying the concentration of the polymers. Subsequently, the thermodynamic parameters for the interaction processes were evaluated. The interaction parameters followed the sequence PDMDAAC > JR400 > LM200. The excited state interaction phenomena were studied from the fluorescence data. Change in the excited state lifetime of the fluorophore was insignificant in all the three cases. Consequently, Stern-Volmer quenching constants of the dye-polymer aggregates were calculated using the standard method. Significant information about the changes on the degree of motion of the fluorescent molecule around the polymer matrix was obtained from the anisotropy measurements.

Keywords

Dye-Polymer Interaction, Fluorescence, Interaction Constant, Anisotropy.
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  • Molecular Basis of the Binding of Dye to Polycations: Absorption and Emission Spectral Studies

Abstract Views: 286  |  PDF Views: 5

Authors

Moumita Chakraborty
Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India
Amiya Kumar Panda
Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India

Abstract


Absorption and emission spectral behaviour of an anionic xanthene dye, eosinY was investigated to perceive the nature and extent of interaction with three different cationic polyelectrolytes. The formation of dye-polymer aggregates was found to be associated with two types of interactive forces: electrostatic and hydrophobic forces. The binding constants and stoichiometry of the dye-polymer aggregates in their ground states were determined by suitably analyzing the absorption spectra by varying the concentration of the polymers. Subsequently, the thermodynamic parameters for the interaction processes were evaluated. The interaction parameters followed the sequence PDMDAAC > JR400 > LM200. The excited state interaction phenomena were studied from the fluorescence data. Change in the excited state lifetime of the fluorophore was insignificant in all the three cases. Consequently, Stern-Volmer quenching constants of the dye-polymer aggregates were calculated using the standard method. Significant information about the changes on the degree of motion of the fluorescent molecule around the polymer matrix was obtained from the anisotropy measurements.

Keywords


Dye-Polymer Interaction, Fluorescence, Interaction Constant, Anisotropy.

References