Smart Stimulation Response of a Pyrene-Based Lanthanide(III) MOF: Fluorescence Enhancement to HX (F and Cl) or R-COOH and Artificial Applicable Film on HCl Vapor Sensing

Abstract

Toxic acids produced by industries are major hazards to the environment and human health, and luminescent pyrenebased crystalline metal−organic frameworks (MOFs) demonstrate promising performance in the detection of toxic acids. Herein, two novel isostructural 3D porous lanthanide MOFs, and Ce (2); H 4 TBAPy (1,3,6,8-tetrakis(p-benzoic acid)pyrene); and DMA: N,N-dimethylacetamide) were synthesized, which showed alb topology. Based on the protonation and hydrogen bond mechanism, complex 1 could be used as a fluorescence recognition sensor for HX (X = F, Cl, Br, and I) acid solutions with different luminescence behaviors. It is worth noting that complex 1 exhibited high sensitivity in the fluorescence enhancement sensing of hydrofluoric acid, oxalic acid, and trichloroacetic acid. In particular, complex 1 had a low limit of detection (LOD) for OA (0.1 μM) and was applied to real monitoring of orange fruit samples. In addition, the PVA@1 film could selectively, sensitively, and quantitatively respond to hydrochloric acid (HCl) vapor through fluorescent quenching; due to its protonation and adsorption capacity, the LOD was 0.18 ppm. Therefore, the portable optical device, the PVA@1 film, can detect HCl gas in trace amounts, achieving the ultimate goal of real-time and rapid detection, which has potential application value for industrial production safety.

Coreactant-Free Zirconium Metal–Organic Framework with Dual Emission for Ratiometric Electrochemiluminescence Detection of HIV DNA

“…Based on the Fourier transform infrared (FT-IR) results, the stretching vibration peak for carboxyl groups of TBAPY lied at 1411 cm –1 , while that of Zr-TBAPY shifted to 1415 cm –1 , showing that Zr 4+ was coordinated with the O of the carboxyl groups (Figure S1). The fluorescence (FL) character of Zr-TBAPY was investigated by comparing to that of TBAPY (Figure B). The FL emission peak of ligand TBAPY was located at 510 nm while that of Zr-TBAPY apparently blue-shifted to 495 nm.…”

Bacterial Cellulose–Based MOF Hybrid as a Sensitive Switch Off–On Luminescent Sensor for the Selective Recognition of l-Histidine

“…These materials exhibit broad possibilities for utilization in gas storage and segregation, catalysis, and optical and sensing applications. − By the incorporation of emissive organic connectors or metal clusters, it is possible to produce porous MOF constructions that exhibit intriguing luminescent properties. These unique metal–organic frameworks, referred to as LMOFs, have attracted considerable attention in recent years due to their extensive photophysical features and immense potential for sensing applications in various areas. − Owing to the remarkable degree of precision in controlling both structure and composition by utilizing a wide range of organic linkers and metal clusters, energy transfer LMOFs are highly promising for numerous luminescence recognition applications. Moreover, the coordination between the organic linkers and metal nodes in MOFs results in a superior level of alignment and organization of chromophores. − …”

Syntheses, crystal structures and properties of a series of isostructural lanthanide organic frameworks

“…Lanthanide ions provide unique luminescence properties to MOFs, positioning Ln-MOFs as promising candidates for applications in sensing, imaging, and optoelectronics. 4–21 In addition, the study of the magnetic behavior of MOFs paves the way for applications of magnetic refrigeration and data storage. 22–24…”