A luminescent 2,1,3-benzoxadiazole-decorated zirconium-organic framework as an exceptionally sensitive turn-on sensor for ammonia and aliphatic amines in water

Abstract

A new dicarboxylate ligand - 4,7-di(p-carboxyphenyl)-2,1,3-benzoxadiazole was synthesised and used for the preparation of 2,1,3-benzoxadiazole-decorated zirconim(IV)-based metal-organic framework UiO-68(bod). Single-crystal X-ray diffraction analysis revelead it to belong to UiO-68 family...

Linker engineering toward near-infrared-I emissive metal–organic frameworks for amine detection

“…Due to the great emission behaviour and excellent chemical stability of nanosized HIAM-3007, especially under aqueous conditions, its potential application as a chemical sensor was explored. As reported, benzo[ c ][1,2,5]thiadiazole and its derivative-based LMOFs exhibited unprecedented sensitivity towards amine detection; 26,35–38 different kinds of amines (aliphatic amines: methanamine, ethylamine, propylamine, ethylenediamine, 1,4-diaminobutane, diethylamine, triethylamine and 1,4-diaminocyclohexane; aromatic amines: aniline, p -aminophenol, o -phenylenediamine, m -phenylenediamine and p -phenylenediamine) were thus chosen to test the response of nanosized HIAM-3007.…”

“…4a, varying degrees of emission enhancements were obtained for different kinds of aliphatic amines at a concentration of 300 μM, which is consistent with reported works which showed that turn-on detection of aliphatic amines can be obtained using benzo[c][1,2,5]thiadiazole and its derivative-based LMOFs. 26,[35][36][37] These results can be ascribed to the strong interaction between aliphatic amines and naphtho[2,3-c][1,2,5]selenadiazole, which will restrict the motion of naphtho[2,3-c][1,2,5]selenadiazole, leading to reduced nonradiative recombination and enhanced emission. 26 The highest emission enhancement, 1.6 times compared with the blank sample, was recorded for diethylamine at a concentration of 300 μM, indicating that the sensitivity of HIAM-3007 for aliphatic amine detection is very low compared with the reported works.…”

Ultrathin MOF nanosheets and their mixed-matrix membranes for ammonia and aliphatic amine sensing in water

“…To test the real-life sensing applicability of Ni-btc NS, we performed an experiment with a model of contaminated wastewater. 15…”

“…For any sensor to be viable for real-time application, along with rapid and high sensitivity, hydrolytic and thermal stability are crucial parameters. [15][16][17][18][19][20][21][22] Metal-organic frameworks (MOFs) have emerged as the most suitable choice for such sensing applications. 23 Metal-organic frameworks (MOFs) are porous inorganic and organic hybrid solids.…”

Recent advances in fluorescence chemosensors for ammonia sensing in the solution and vapor phases

“…An interesting 2,1,3-benzoxadiazole decorated electron-deficient Zr( iv )-based LMOF 7 for ‘turn-on’ fluorescence sensing of NH 3 was recently reported by the Potapov group. 50 LMOF 7 was prepared by heating a mixture of a dicarboxylate ligand, 4,7-di( p -carboxyphenyl)-2,1,3-benzoxadiazole ( L 7 ), and zirconium tetrachloride in DMF (Fig. 4(A)).…”