Preparation of a Polymer-Supported Fluorene-Based Receptor for Quantitative and Efficient Binding of Silver Cations

摘要

We have designed and synthesized a polymer-supported material in which a versatile fluorene-p-xylene-based receptor is woven onto the backbone of polystyrene.This polymer-supported receptor adopts a pi-prismand-like conformation through a simple C- C bond rotation that results in the quantitative binding of a single silver cation per receptor site with a remarkable efficiency that exceeds the binding abilities of the well-known tris[2.2.2]-p-cyclophane (or pi prismand) by at least a factor of 100.More importantly,the binding event can be readily monitored by ~1H NMR spectroscopy,as well as by a more sensitive emission spectroscopic technique in which the quenching of fluorescence of the receptor moiety is quantitatively related to the binding of silver cations.