pH Dependence of the Interaction between Rhodamine B and the Water-Soluble Poly(sodium 4-styrenesulfonate)
The Journal of Physical Chemistry B2006Vol. 110(24), pp. 11809–11812
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Ignacio Moreno‐Villoslada, Marlen Jofré, Víctor Miranda, Rodrigo González, Tamara Sotelo, Susan Hess, Bernabé L. Rivas
Abstract
The binding of rhodamine B (RB) to the polyanion containing aromatic groups poly(sodium 4-styrenesulfonate) (PSS) is studied by separation and spectroscopic techniques at pH between 2 and 7. Significant binding is found at pH below 5, together with a red-shift of the RB maximum of absorbance to 564 nm, and RB fluorescence quenching. The dependence of the pH is related with protonation of RB molecules. Fluorescence quenching is a consequence of a more hydrophobic environment and may occur on territorially or site-specifically bound molecules, and/or on self-aggregated molecules in a hydrophobic polymer domain. Remarkably, the basicity of RB is increased by the influence of the polymer.
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