pH Dependence of the Interaction between Rhodamine B and the Water-Soluble Poly(sodium 4-styrenesulfonate)
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- 作者：Ignacio Moreno-Villoslada ; Marlé ; n Jofré ; Ví ; ctor Miranda ; Rodrigo Gonzá ; lez ; Tamara Sotelo ; Susan Hess ; and Bernabé ; L. Rivas
- 刊名：Journal of Physical Chemistry B
- 出版年：2006
- 出版时间：June 22, 2006
- 年：2006
- 卷：110
- 期：24
- 页码：11809 - 11812
- 全文大小：63K
- 年卷期：v.110,no.24(June 22, 2006)
- ISSN：1520-5207
文摘
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 isfound at pH below 5, together with a red-shift of the RB maximum of absorbance to 564 nm, and RBfluorescence quenching. The dependence of the pH is related with protonation of RB molecules. Fluorescencequenching 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.