A Multicenter Metal–Organic Framework for Quantitative Detection of Multicomponent Organic Mixtures

Abstract

Instant recognition and quantification of multi-component organic mixtures, especially the ones with similar characteristics, remains a key challenge in the chemical industry. Although luminescence sensing is considered a rapid and facile method for the detection of various chemical substances, the simultaneous and quantitative detection of three or more components has not yet been achieved. Herein, we report a rationally designed white-light-emitting metal-organic framework (MOF) EuTb@NKU-102, and demonstrate its application in the simultaneous discrimination of multicomponent organic mixtures. The concentration of each component in the mixture can be obtained based on the correlation of the emission intensity changes in 10 s, enabling instant and quantitative analysis. The sensing mechanism of this complex system was studied in detail. This study paves the way for the rapid detection of multi-component mixtures using MOF-based luminescent material with multi-emission centers.

Ratiometric Fluorescence Thermometry, Quantitative Gossypol Detection, and CO2 Chemical Fixation by a Multipurpose Europium (III) Metal–Organic Framework

“…Benefiting from multiple advantages such as coordination versatility and tunable functional sites, metal–organic frameworks (MOFs) with diverse structures have attracted tremendous attention due to their fascinating application ranging from catalysis, − luminescent chemosensors − to many other fields. − As a subfamily of crystalline MOF materials, luminescent lanthanide-based MOFs (Ln-MOFs) demonstrate unique optical properties such as long luminescence lifetime and broad application spectrum owing to their f-electrons. − These luminescent Ln-MOFs could provide many opportunities for realizing attractive performance and modifiable structural functionality by the encapsulation of some predictable and tunable component matrix. − It is clear that the luminescence behaviors of the Ln-MOFs, dominated by the effective energy transfer processes, can be regulated by the ligands for achievement of the sensitization process via an “antenna effect” and can be achieved simultaneous luminescence of lanthanide ions and ligands. As a result, the luminescent sensing performances of the Ln-MOFs with the desired response behaviors can be successfully achieved by the selection and optimization of light emission sources such as the lanthanide ions, the ligands, the guest molecules, and the counter ions. − Moreover, the molecular aggregation structures of the Ln-MOFs could also have significant influence on the luminescent sensing behaviors. The crystallized coordination spheres of the lanthanide ions will result in the orderly stacking of the ligands and individual independence of the lanthanide ions along the preferential direction in the Ln-MOFs, which will have an adverse effect on the energy transfer between the Ln-MOFs, thus preventing self-quenching processes .…”

Cage-Based Metal–Organic Framework as an Artificial Energy Receptor for Highly Sensitive Detection of Serotonin

“…Considering the excellent designability in terms of structures and energy levels, metal–organic frameworks (MOFs) are highly promising receptors. − To date, efforts have been paid to screening MOFs to match with 5-HT, to realize the recognition of 5-HT at various conditions. − Most MOFs interact with 5-HT via the exchange of photons and/or electrons through the luminescence quenching mechanism. The interactions in this way are often influenced by interfering substances with overlapping energy levels of 5-HT.…”

A turn-on fluorescent Zn(ii) metal–organic framework sensor for quantitative anthrax biomarker detection

“…[8][9][10] Up to now, MOFs have shown superior physical performance in various fields, such as gas adsorption and separation, [11][12][13][14][15][16] biological imaging, [17][18][19] heterogeneous catalysis, [20][21][22] luminescence and other fields with great potential. [23][24][25][26][27][28][29][30][31] In particular, the application of MOFs as sensing materials is one of their most important applications. A combination of fluorescence bridging ligands and photo-active metal ions can be introduced into MOFs, inducing a variation in fluorescence signals.…”