Europium(iii) β-diketone complex as portable luminescent chemosensor for naked eye Cu²⁺ detection and recyclable on–off–on vapor response

Abstract

A novel Eu3+ complex coordinated by polymers with β-diketone pendant groups (Eu3+–PDKMA) has been synthesized for Cu2+ cation and acid–base vapor detections.

A paper-based lanthanide smart device for acid–base vapour detection, anti-counterfeiting and logic operations

“…22 A wide absorption band of Eu-PBA and Tb-HPBA between 300 and 400 nm shows a slight red shift compared to that of the uncoordinated ligand owing to the perturbation of the lanthanide ions. 23 Very interestingly, the luminescence properties of Tb-HPBA and Eu-PBA are also remarkable even on the filter paper. Insets in Fig.…”

Turn-on and Ratiometric Luminescent Sensing of Hydrogen Sulfide Based on Metal–Organic Frameworks

“…However, because of the higher coordination numbers and more variable nature of the Ln 3+ coordination sphere, the rational design and preparation of desired Ln-based MOFs still remain a challenge. Recently, an increasing number of Ln-doped MOFs constructed by postsynthetic modification (PSM) have been prepared. − The luminescence of lanthanides can be tuned by the introduction of transition-metal ions (d block) into the lanthanide (f block) organic frameworks. − …”

“…Considering the flexibility of functionalization of MOFs, the design could be done by the introduction of active metal center (Cu 2+ ) into the framework as the H 2 S-responding site. Cu 2+ ions in aqueous solution have been found to be able to quench the fluorescence of Eu 3+ ions. , This inspired us to incorporate Cu 2+ ions into Eu 3+ @UiO-66-(COOH) 2 to form a luminescence-quenched Eu 3+ /Cu 2+ @UiO-66-(COOH) 2 . H 2 S has a strong affinity for Cu 2+ ions, which as a result weaken the quenching effect of Cu 2+ ions on Eu 3+ ions.…”

“…Cu 2+ ions in aqueous solution have been found to be able to quench the fluorescence of Eu 3+ ions. 33,34 This inspired us to incorporate Cu 2+ ions into Eu 3+ @UiO-66-(COOH) 2 to form a luminescence-quenched Eu 3+ /Cu 2+ @UiO-66-(COOH) 2 . H 2 S has a strong affinity for Cu 2+ ions, which as a result weaken the quenching effect of Cu 2+ ions on Eu 3+ ions.…”

A Luminescent NOTA-Based Terbium(III) “Turn-Off” Sensor for Copper

“…Copper shows high redox activity and can exist in three different oxidation states (Cu 0 , Cu + , and Cu 2+ ). Cu 2+ ions are capable of luminescence quenching through an electron or energy transfer mechanism taking place from the luminescent molecule to the metal ion (or vice versa) and through paramagnetic effects. , This quenching ability is due to the Cu­(II)’s unfilled 3d 9 shell and has been exploited in the design of many fluorescence-based copper sensors. , An area of growing interest is the design of copper sensing probes that employ lanthanides, namely, Tb­(III) and Eu­(III), due to their highly attractive photophysical properties (e.g., millisecond luminescence lifetimes, large Stokes shift, emission in the visible and sharp distinct emission bands, high photostability, and low phototoxicity). , Designs of lanthanide probes for copper sensing include small molecule probes, − peptide mimics of metallo-protein binding sites, nanoparticles, and polymer-based materials. − …”