Stable Luminescent Metal–Organic Frameworks as Dual-Functional Materials To Encapsulate Ln³⁺ Ions for White-Light Emission and To Detect Nitroaromatic Explosives

Abstract

A stable porous carbazole-based luminescent metal-organic framework, NENU-522, was successfully constructed. It is extremely stable in air and acidic/basic aqueous solutions, which provides the strategy for luminescent material encapsulation of Ln(3+) ions with tunable luminescence for application in light emission. More importantly, Ln(3+)@NENU-522 can emit white light by encapsulating different molar ratios of Eu(3+) and Tb(3+) ions. Additionally, Tb(3+)@NENU-522 is found to be useful as a fluorescent indicator for the qualitative and quantitative detection of nitroaromatic explosives with different numbers of -NO2 groups, and the concentrations of complete quenching are about 2000, 1000, and 80 ppm for nitrobenzene, 1,3-dinitrobenzene, and 2,4,6-trinitrophenol, respectively. Meanwhile, Tb(3+)@NENU-522 displays high selectivity and recyclability in the detection of nitroaromatic explosives.

Selective Sensing of Fe3+ and Al3+ Ions and Detection of 2,4,6‐Trinitrophenol by a Water‐Stable Terbium‐Based Metal–Organic Framework

“…[14] However, owing to their stronge lectron affinities, it is still ac hallenge to selectively detect TNP in the presence of other nitro aromatic explosives. [15] Although some Ln-MOFs have been employed for explosive detection, only af ew reports of Ln-MOF or Ln@MOFs based probesc an selectively detectT NP in the presence of other nitro aromatic compounds in aqueous media. [16] Because of the oxophilic nature of lanthanide ions, the use of terephthalic acid and its derivatives to act as chromophoric ligandsi so ne of the mostc ommona nd efficient methods to constructn ovel lanthanide-containing porous MOFs with interesting structures and high luminescence quantum yields in previousr eports.…”

An Overview of Detection and Neutralization of Chemical Warfare Agents Using Metal Organic Frameworks

“…In this regard, several researchers have evaluated MOFs as luminescent detectors for nitro aromatic explosives reference [36,37]. A guest molecule activity at the active site of the host MOF through the pore structure of the MOF generates a change in luminescence.…”

Solvent-dependent structural diversity of cadmium(II) coordination polymers: syntheses, characterizations, and luminescence properties

“…Meanwhile, CPs exhibit attractive properties and can be used in gas storage and separation, nonlinear optics, catalysis, magnetism, luminescence, drug delivery, sensing, and detection [1][2][3][4][5][6][7][8][9][10]. Many factors can influence construction of CPs, e.g., metal ions, ligands, solvents, pH, reaction temperatures, etc.…”