Design of an antenna effect Eu(iii)-based metal–organic framework for highly selective sensing of Fe3+?

Dalton Transactions Pub Date: 2022-01-18 DOI: 10.1039/D1DT03995D

Abstract

Highly selective sensing of Fe3+ is very important due to its great effect on biological systems. A novel ligand [1,1′:4′,1′′:4′′,1′′′:4′′′,1′′′′-quinquephenyl]-2,2′′,2′′′′,5′′-tetracarboxylic acid (H4qptca) was designed and successfully obtained for the first time via three steps in high total yields according to the absorption spectrum of Fe3+. The europium(III)-based metal–organic framework derived from H4qptca, {[Eu(qptca)1/2(H2qptca)1/2(H2O)2]·DMF}n (referred to as SLX-1), was then synthesized and used as a water-stable and highly selective luminescent sensor for Fe3+ in aqueous solution with a comparable detection limit using Ln-MOF probes (6.45 μM) through the antenna effect of SLX-1. Furthermore, the luminescence quenching mechanism was also proposed as a competitive absorption mechanism.

Graphical abstract: Design of an antenna effect Eu(iii)-based metal–organic framework for highly selective sensing of Fe3+
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