Electrospinning Fabrication of Europium-Chain@polymer Nanofiber Films for Visual Detection of the Fe³⁺ Ion

Abstract

A ternary europium­(III) coordination polymer, namely, [Eu­(ctpy)­(tta)2] n (1) (Hctpy = 4′-carboxy-2,2′:6′,2″-terpyridine and Htta = 2-thenoyltrifluoroacetone), was obtained and exhibits a 1D chain structure. 1-Eu emits intense red light, which can act as a luminescent dopant to be immobilized into polymers to prepare nanofiber films by an electrospinning technique. Subsequently, ternary europium-chain@polymer nanofiber films (1-Eu@PAN and 1-Eu@PMMA, PAN = polyacrylonitrile, PMMA = poly­(methyl methacrylate)) as functional films have been successfully fabricated. These nanofiber films possess excellent mechanical strength and photo-/thermal stability, as well as emit luminous red light. The luminescent investigation indicates that the maximum intensity of the 5D0 → 7F2 transition of EuIII ion occurs in 1-Eu@PAN and 1-Eu@PMMA nanofiber films with 10 wt % 1-Eu loading. In addition, 10% 1-Eu@PAN nanofiber film can be used as a recyclable sensor for detecting Fe3+ ion in aqueous solution because 10% 1-Eu@PAN nanofiber film have good recyclability and selectivity. Electrospinning technique is an effective strategy to fabricate lanthanide coordination polymer-encapsulated polymer fiber films and to contribute to develop sensors.

Multiterpyridyl Ligand/Cadmium(II) Coordination Polymer Nanosheets for Recoverable Luminescent Sensors

“…At the same time, the N 1s peak shifted from 399.65 to 400.02 eV (Figure S9). Cu 2+ is an unsaturated electron configuration, which may interact with terpyridyl groups with rich electrons in the ligand L, so some electrons (or charges) transfer to Cu 2+ ions, which affects the coordination in the Cd-nanosheet and causes the change of binding energy, eventually leading to the luminescence quenching of the Cd-nanosheet. − …”

Advances in electrospun nanofibrous membrane sensors for ion detection

“…The sensor exhibits excellent selectivity and sensitivity for iron ions with a detection limit of 63 nM. Bai et al 98 doped a chain complex (1-Eu 3+ ) formed by Eu 3+ and organic molecular ligands into PAN solution, and fabricated an iron ion-responsive nanofibrous membrane sensor (1-Eu 3+ @PAN). The sensor showed obvious red fluorescence quenching under iron ion treatment, and the detection limit was 6.685 × 10 −4 M.…”

Synthesis of a Cd-MOF Fluorescence Sensor and Its Detection of Fe3+, Fluazinam, TNP, and Sulfasalazine Enteric-Coated Tablets in Aqueous Solution

“…Luminescent metal–organic frameworks (LMOFs) are hybrid materials with porous structures assembled by organic connectors and metal cations through coordination bonds. LMOFs have been widely implemented in various fields such as gas absorption and separation, − fluorescence detection, biological imaging, and photocatalytic degradation of organic pollutants . Sheldrick et al reported Eu-MOFs that can selectively sense Fe 3+ through fluorescence quenching .…”