Molecular Interaction Between Cationic Polymer Polyethyleneimine and Rose Bengal Dye: A Spectroscopic Study

Abstract

The binding mechanism and polymer–fluorescence probe interactions between polyethyleneimine (PEI) and Rose Bengal (RB) was investigated by using UV–Vis absorption, steady- state and time-resolved fluorescence spectroscopy techniques since they remain major research topics in photophysics. The spectroscopic data indicated that an unusual interactions for PEI-RB system was occurred. Binding constants (KSV) and quantities of binding were calculated with high linearity. Significant photophysical parameters as band shifts, fluorescence quantum yields and fluorescence lifetimes were determined to comprehend how photophysical and spectroscopic features of the dye compounds were affected by the polymer. With this respect, this study is significant in terms of gaining dye-polymer relationship to the literature.