Stilbene ligand‐based metal–organic frameworks for efficient dye adsorption and nitrobenzene detection

Abstract

The technological developments of metal–organic framework (MOF) for selective adsorption and sensing have been achieved in recent years. Herein, we report two stilbene‐based MOFs, denoted as Zn3(SDC)3(bpy) (1) and Zn(SDC)(bpy)·2DMF (2). MOFs 1 and 2 were synthesized in pure form by controlling the organic linker ratio and were used for the adsorptive removal of dye molecules. Despite their low adsorption capacities, the MOFs were more selective toward cationic dye (methylene blue) than anionic dye (methyl orange). The unique fluorescent property of the MOFs was harnessed for the sensing of harmful organic molecules. Interestingly, the fluorescence of 1′ was quenched by aromatic analytes containing amine and nitro functional groups. However, 2′ only showed modest fluorescence quenching by nitrobenzene. The quenching efficiency of nitrobenzene had a low detection limit for 1′ and 2′ (14.28 and 25.42 μM, respectively). These MOFs can be used as adsorbents and highly sensitive chemical sensors.

Stability of Zr-Based UiO-66 Metal–Organic Frameworks in Basic Solutions

“…This aspect has been extensively investigated in the field of MOF chemistry. The porosity of MOFs has been exploited for efficient gas storage and molecular separation, leveraging sieving effects, and their unique structural characteristics have found applications in diverse fields [ 11 , 12 , 13 , 14 , 15 , 16 ]. The tunable pores of MOFs hold promise for selective molecular conveyance, such as drug delivery applications [ 17 , 18 , 19 ].…”

TEMPO-immobilized metal–organic frameworks for efficient oxidative coupling of 2-aminophenols and aldehydes to benzoxazoles

“…15,22–26 Metal–organic frameworks (MOFs) are three-dimensional organic–inorganic hybrid heterogeneous materials that have been extensively used in various applications, including gas storage, molecular separation, and molecular shuttling, because of their permanent porosity. 27–31 MOFs exhibit structural diversity, not only in terms of their inorganic nodes but also their organic ligands, which can be functionalized with various useful organic molecules. Consequently, over the past decade, various research groups have explored the immobilization of TEMPO-derived nitroxyl radical species onto MOFs.…”

A highly stable hydrogen-bonded organic framework for hydrogen storage

“…1,2 Similar to other porous crystalline materials, such as metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), HOFs exhibit numerous advantages, including high crystallinity, enduring porosity, adjustable functionality, and structural diversity, enabling their potential for various applications such as ionic conductivity, sensing, catalysis, and gas separation, similar to MOFs and COFs. [3][4][5][6][7][8][9][10][11] Thanks to the distinctive characteristics of the hydrogen bonds that form the meticulously organized framework, these materials exhibit unique properties rarely observed in other porous materials. One of these properties is the S-shape isotherm (type IV).…”