Syntheses, structures, magnetic, and luminescent properties of five lanthanide-based MOFs with p-phenylenediamine-tetraacetic acid ligand

A Six-Armed Phenhomazine Ligand with a Potential "Turn-Off" Copper(II) Sensing Capability through Terbium(III) Luminescence Quenching

Herein, the design, synthesis, and characterization of a phenhomazine ligand are described. The ligand has six pendant acetate arms designed for the combined coordination of copper(II) and lanthanide(III) ions, with the perspective of developing a "turn-off" copper sensor. The key step for the ligand preparation was the one-step endomethylene bridge fission of a diamino Tröger's base with a concomitant alkylation. Fluorescence and absorption spectroscopies as well as nuclear magnetic resonance (NMR) experiments were performed to analyze and understand the coordination properties of the ligand. Transition metal coordination was driven by the synergistic effect of the free nitrogen atoms of the diazocinic core and the two central acetate arms attached to those nitrogen atoms, whereas lanthanide coordination is performed by the external acetate arms, presumably forming a self-assembled 2:2 metallosupramolecular structure. The terbium complex shows the typical green emission with narrow bands and long luminescence lifetimes. The luminescence quenching produced by the presence of copper(II) ions was analyzed. This work sets, therefore, a starting point for the development of a phenhomazine-based "turn-off" copper(II) sensor.

Rare-earth metal–organic frameworks: from structure to applications

In the past 30 years, rare-earth metal–organic frameworks (MOFs) have been gaining attention owing to their diverse chemical structures, and tunable properties.

Structural characterization and optical properties of two copper(i)-iodide BODIPY coordination polymers

BODIPY chromophores with pyridyl or pyrimidinyl substituents exhibit strong solid-state fluorescence which is quenched in CuI coordination polymers.

A terbium(iii)-based coordination polymer for selective and sensitive sensing of nitroaromatics and ferric ion: synthesis, crystal structure and photoluminescence properties

A Tb(iii)-based coordination polymer has been synthesized and it is a visually selective and sensitive sensor for the detection of 4-nitrophenol and Fe³⁺ ion.

Highly selective and sensitive detection of metal ions and nitroaromatic compounds by an anionic europium(iii) coordination polymer

A luminescent Eu(iii)-based coordination polymer has been synthesized, which can serve as a visual selective sensor for the detection of 4-nitrophenol and Fe³⁺ ions via a fluorescence quenching mechanism.