A Multifunctional Tb-MOF for Highly Discriminative Sensing of Eu³⁺ /Dy³⁺ and as a Catalyst Support of Ag Nanoparticles

Abstract

Exploring novel multifunctional rare earth materials is very important because these materials have fundamental interests, such as new structural facts and connecting modes, as well as potential technological applications, including optics, magnetic properties, sorption, and catalytic behaviors. Especially, employing these nanomaterials for sensing or catalytic reactions is still very challenging. Herein, a new superstable, anionic terbium-metal-organic-framework, [H N(CH ) ][Tb(cppa) (H O) ], (China Three Gorges University (CTGU-1), H cppa = 5-(4-carboxyphenyl)picolinic acid), is successfully prepared, which can be used as a turn-on, highly-sensitive fluorescent sensor to detect Eu and Dy , with a detection limitation of 5 × 10 and 1 × 10 m in dimethylformamide, respectively. This result represents the first example of lanthanide-metal-organic-frameworks (Ln-MOF) that can be employed as a discriminative fluorescent probe to recognize Eu and Dy . In addition, through ion exchanging at room temperature, Ag(I) can be readily reduced in situ and embedded in the anionic framework, which leads to the formation of nanometal-particle@Ln-MOF composite with uniform size and distribution. The as-prepared Ag@CTGU-1 shows remarkable catalytic performance to reduce 4-nitrophenol, with a reduction rate constant κ as large as 2.57 × 10 s ; almost the highest value among all reported noble-metal-nanoparticle@MOF composites.

Synthesis of Bimetallic Conductive 2D Metal–Organic Framework (CoxNiy‐CAT) and Its Mass Production: Enhanced Electrochemical Oxygen Reduction Activity

“…Porous carbon‐based ORR catalysts with heteroatom‐doping (such as nitrogen, phosphorous, and cobalt) are one of the attractive candidate materials for replacing platinum‐based catalysts . By the way, metal–organic frameworks (MOFs) are typically porous materials which are widely used in gas storage, separation, catalysis, and sensing applications . In addition to these classical applications, MOFs are currently considered promising materials for electrocatalytic applications due to their high surface area and well‐developed pore with versatile structures and chemical compositions .…”

Cover Feature: Porous Metal–Organic Frameworks Containing Reversible Disulfide Linkages as Cathode Materials for Lithium‐Ion Batteries (ChemSusChem 9/2020)

“…Metal-organic frameworks (MOFs), [4,5] which are porous materials comprising metal ions and ligands, have attracted much attention for applicationss uch as sensors, [6,7] crystal sponges, [8,9] luminescent materials, [10,11] and soft crystals, [12] and have been also used as cathode active materials in rechargeable batteries. [13] The porous frameworks of MOFs allow one to realize stable battery performances, whereas the dual redox reactions of metal ions and ligands improve the capacity.…”

Enhanced Crystallization and Optimized Morphology of Perovskites Through Doping an Indium‐Based Metal–Organic Assembly: Achieving Significant Solar Cell Efficiency Enhancements

“…During the past few years, metal–organic assembly has attracted increasing interest due to the potential applications in gas storage, catalysis, photoluminescence sensor, and drug delivery . Very recently, a metal–organic assembly has also shown the potential to be applied in PSCs.…”