Luminescence tuning and sensing properties of stable 2D lanthanide metal–organic frameworks built with symmetrical flexible tricarboxylic acid ligands containing ether oxygen bonds

Abstract

New Ln-MOFs were yielded by a flexible ligand and lanthanide ions. The colors can be regulated by adjusting the molar ratios of Eu3+/Tb3+, showing promising applications in NB sensing, tunable photoluminescence and pH sensing.

Mixed matrix membranes based on fluorescent coordination polymers for the detection of Cr2O72− in water

“…Fluorescence quenching of CPs caused by ions is mainly due to the following possibilities: (i) destruction of the CP structure; 28 (ii) interaction between target ions and organic ligands in CPs; 29 (iii) interaction between target ions and metal atoms in CPs; 30 (iv) overlap between the UV-vis absorption bands of target ions and the excitation bands of CPs; 31 and (v) overlap between the UV-vis absorption band of target ions and the fluorescent emission bands of CPs. 32–34 PXRD patterns were well retained for m-1 , m-2 and m-3 after detection tests, indicating that the quenching of fluorescence was not due to the destruction of CP structures, which ruled out the possibility of (i).…”

Luminescent lanthanide complexes based on 4,5-di(3,5-dicarboxylphenoxy)phthalic acid as enhanced fluorescence probes for highly selective detection of lead(ii) ions in water

“…Aromatic polycarboxylic acid ligands including ether bonds appear particularly attractive: these flexible σ bonds can reduce steric hindrance by free rotation and maximizing the coordination requirements of metal ions. [30][31][32][33][34][35][36] Moreover, the ether bonds may interact with metal ions as additional Lewis basic sites to achieve the identification of metal ions with precision. [37][38][39][40][41] Herein, we report six two-dimensional (2D) and structurally novel complexes 1-6 ([Nd 2 (L)(H 2 O) 6 ] n •4.58n(H 2 O) (1), [Ln(H 3 L)(H 2 O)] n •0.5n(H 2 O), Ln = Sm (2), Eu (3), Gd (4), Tb (5), Eu 0.18 Gd 0.62 Tb 0.20 (6)), which are constructed by the aromatic polycarboxylic acid ligand 4,5-di (3,5-dicarboxylphenoxy) phthalic acid (H 6 L, shown in Scheme S1 †) featuring ether bonds.…”

Fluorescence detection of malachite green and cations (Cr3+, Fe3+ and Cu2+) by a europium-based coordination polymer

“…Due to multiple coordination modes and remarkable fluorescence characteristics, 44–53 lanthanide CP (such as Tb-CP, Eu-CP) have been widely employed in fluorescent detection, 54–65 such as detecting metal cations, 66–75 inorganic anions, 69–75 small organic molecules 76–80 and explosives. 81–83 However, it is rarely recorded that lanthanide CP as multifunctional luminescent probe dedicated to detecting MG and various metal ions.…”