Interfacial films of cyclic polyguanamine derivatives for metal capturing: Selectivity and fluorescence emission properties

Abstract

We demonstrated that the interfacial films of a cyclic moiety-containing polyguanamine derivative have selectivity for metal capturing. In addition, the selectivity of the fluorescence emission depending on the captured metal ion species was determined. The metal capturing of the polyguanamine Langmuir monolayer demonstrated high selectivity for the metal cations present in the subphase depending on the ionic radius and valence. Therefore, it was confirmed that metal cations with a small ionic radius and large valence tended to be preferentially captured. This is consistent with typical metal desorption behavior, and cations that are more difficult to desorb are preferentially captured. In addition, the tilt angle of the cup-shaped conformation at the annular site correlated with the metal capturing selectivity. Furthermore, the emission and quenching of the fluorescence changed significantly depending on the captured metal ion species.