A red luminescent Eu3+ doped conjugated microporous polymer for highly sensitive and selective detection of aluminum ions

Abstract

A red luminescent europium ion (Eu³⁺) doped CMP composite (Phen-Eu@BPPD-CMP) was prepared for the first time, in which Eu³⁺ ions coordinated with diketone moieties and 1,10-phenanthroline (Phen). The fluorescent composite could be used as a chemosensor for highly sensitive and selective detection of aluminum ions (Al³⁺). Compared to a linear polymer analogue (Phen-Eu@BPPD-LP), Eu³⁺-doped CMP without Phen groups (Eu@BPPD-CMP), and a Eu(OAc)₃-BPPD-CMP mixture, Phen-Eu@BPPD-CMP allowed for the rapid detection of Al³⁺, which could have been caused by the mutual promotion of π-conjugated skeletons and the complementary coordination of Phen groups to facilitate the sensing process and improve the response to Al³⁺ ions.