Synthesis of multidentate functional monomer for ion imprinting

Abstract

In this work, N,N,N‐tir(2‐carboxyethyl)‐3‐(2‐aminoethylamino)propyl‐trimethoxysilane was prepared as a multidentate functional monomer. The 3D model of the monomer coordinating with Cu²⁺ indicated that the monomer is able to provide five ligating atoms like ethylenediaminetetraacetic acid‐Cu²⁺ to complex with Cu²⁺. When Cu²⁺ was used as a template ion, the synthesis conditions of Cu²⁺ imprinted polymers were optimized upon orthogonal design. It is interesting to find that Cu²⁺ imprinted polymer offers a selectivity coefficient of 192.2 when the molar ratio of Cu²⁺ to monomer was exactly 1:1. That means there is no excess ligating atom in the ion‐imprinted polymer and therefore, the non‐specific adsorption could be avoided. Benefiting from the excellent selectivity of Cu²⁺ imprinted polymer, even if the concentration of Zn²⁺ was 25 times that of Cu²⁺, Cu²⁺ imprinted polymer still affords a high selectivity coefficient. Finally, the optimal synthesis conditions for Cu²⁺ imprinted polymer were adopted to prepare Ni²⁺ imprinted polymer except pH, and Ni²⁺ imprinted polymer also offered satisfying selectivity to Ni²⁺. That implies this multidentate monomer is adaptable in ion imprinting and, the optimal synthesis conditions of Cu²⁺ imprinted polymer except pH are likely suitable for the imprinting of other ions besides Cu²⁺. This article is protected by copyright. All rights reserved