Dye-Encapsulated Lanthanide-Based Metal–Organic Frameworks as a Dual-Emission Sensitization Platform for Alachlor Sensing

Abstract

As an important factor affecting global agricultural output, pesticides have a significant impact on the ecosystem. It is an urgent task to accurately and conveniently detect pesticide residues after their application. Herein, a fluorescent dye@MOF platform was designed via the encapsulation of rhodamine B (RhB) into the MOF structure (named RhB@HNU-48), which can significantly enhance the sensing sensitivity of alachlor with an ultralow detection limit of 0.59 ppb. The improved sensitivity of RhB@HNU-48 to pesticides was attributed to the host–guest interactions that affect the excitation and emission spectra of the composites. Based on the sensing capability of RhB@HNU-48, a logic gate was built to evaluate the safety level of alachlor residues in rivers and soil. The preparation of photofunctionalized MOF composites through modulation of host–guest interactions offers a promising strategy for the construction of desired sensors for agricultural residues.

A Pitaya-Inspired Modular Cylindrical MOF-Based Capsule Design for Pesticide Signal Probes

“…Studying these pieces of evidence, the concomitant action of the absorption energy competition led to fluorescence quenching. The capsules had aromatic rings, imidazoles, deprotonated carboxyl groups, and hydroxyl groups, and there might exist π–π stacking interaction and hydrogen bonding between capsule and alachlor …”

“…The capsules had aromatic rings, imidazoles, deprotonated carboxyl groups, and hydroxyl groups, and there might exist π−π stacking interaction and hydrogen bonding between capsule and alachlor. 45 The gel capsules exhibited flexible structures in aqueous solution. Their uniform apertures allowed alachlor molecules to enter the inner pores and promoted full utilization of open sites (the three-dimensional size of alachlor is shown in Figure S28).…”

The construction of dual-emissive ratiometric fluorescent probes based on fluorescent nanoparticles for the detection of metal ions and small molecules

“…The small size of organic dyes allows them to easily encapsulated in the pores of MOFs and dispersed uniformly, thus avoiding ACQ. Many dye@MOF composites have been explored for the detection of metal ions, [121][122][123][124][125][126][127][128][129] antibiotics, [130][131][132] food additives, 133,134 explosives, [135][136][137] pesticides, [138][139][140] medicine, 141 and water in organic solvents. 142 In addition to dyes, CDs, QDs, and Ru (bpy) 3 2+ can also be encapsulated in LMOFs to avoid their agglomeration and improve their stability.…”

Recent advancements in combining MOFs and natural compounds for cancer therapy

“…Metal-organic frameworks (MOFs) are innovative inorganicorganic hybrid porous materials created from metal clusters and organic linkers. [7][8][9] Due to their large surface area, tunable structure, adjustable pore size and easy post-modification, MOFs have been widely researched for a variety of applications, such as gas separation, [10][11][12][13][14][15][16][17][18][19] luminescence, [20][21][22][23][24][25][26][27][28][29][30] and catalysis. [31][32][33][34] In particular, MOFs possess unique advantages for the development of biomedical applications.…”