Europium-Based Metal–Organic Framework as a Dual Luminescence Sensor for the Selective Detection of the Phosphate Anion and Fe³⁺ Ion in Aqueous Media

Abstract

A new three-dimensional europium-based metal−organic framework has been synthesized with the newly designed ligand L (6-[1-(4-carboxyphenyl)-1H-1,2,3-triazol-4-yl]nicotinic acid). This compound acts as a dual sensor for the phosphate anion and Fe 3+ ion in aqueous media. The mechanistic aspect of this selectivity and sensitivity was explored through several spectroscopic methods and then correlated with the corresponding structure.

Recent advances in process engineering and upcoming applications of metal–organic frameworks

“…3H 2 O. DMF] n Cr 2 O 7 2− 0.058 µM 5 [419] [[Cu I 2 (ttpa) 2 ][Cu II (bptc)]. 3H 2 O. DMF] n CrO 4 2− 0.07 µM 5 [419] Cd-MOF S 2 O 8 2− – – [412] [Eu 2 L 3 (DMF)]·2 DMF PO 4 3− 6.62 µM – [420] c. Sensors for explosive compounds AuNCs/ZIF-8 TNT 5 nM – [413] [Tb(TCBA)(H 2 O) 2 ] 2 ·DMF TNP 1.64 ppb 5 [414] UIO-66-Py TNP 0.45 µM – [421] Eu-MOF TNP 0.03 mM – [422] Eu-MOF NB 0.04 mM – [422] Eu-MOF PNT 0.09 mM – [422] Eu-MOF PNP 0.08 mM – [422] HNU-34 TNP 36.15 nM 5 [415] HNU-34 2,4 DNP 42.55 nM 5 [415] ...…”

Devising Mixed-Ligand Based Robust Cd(II)-Framework From Bi-Functional Ligand for Fast Responsive Luminescent Detection of Fe3+ and Cr(VI) Oxo-Anions in Water With High Selectivity and Recyclability

“…Syndrome like insomnia, cancer, heart and declining immunity is correlated with iron content in the human body. ( Dang et al, 2012 ; Liu et al, 2016 ; Chandra Rao and Mandal, 2018 ) Also, in the physiological milieu, iron exists as Fe 2+ and Fe 3+ are essentially playing a significant role So, it is imperative to detect one from the other because a specific amount of Fe 3+ is needed to promote the formation of muscle and haemoglobin. ( Barba-Bon et al, 2012 ; Gogoi and Biswas, 2018 ) Though a wide range of literature is available for sensing of Fe 3+ ions but sensing under aqueous condition is still rare.…”

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“…24−26 As a pollutant anion, PO 4 3– possesses less binding reactive sites and lower reactivity, so detection of PO 4 3– emerges a major challenge in the field of chemosensors. 27−29…”