Anionic Lanthanide MOFs as a Platform for Iron-Selective Sensing, Systematic Color Tuning, and Efficient Nanoparticle Catalysis

Abstract

New porous anionic Ln-MOFs, namely, [MeNH][Ln(CPA)(HO)] (Ln = Eu, Gd), have been prepared through the self-assembly of 5-(4-carboxy phenyl)picolinic acid (HCPA) and lanthanide ions. They feature open anionic frameworks with 1-D hydrophilic channels and exchangeable dimethylamine ions. The Eu phase could detect Fe ions with high selectivity and sensitivity in either aqueous solution or biological condition. The ratios of lanthanide ions on this structure platform could be rationally tuned to not only achieve dichromatic emission colors with linear correlation but also attain three primary colors (RGB) and even white light with favorable correlated color temperature. Furthermore, the Ag(I)-exchanged phases can be readily reduced to afford Ag nanoparticles. The as-prepared Ag@Ln-MOFs composite shows highly efficient catalytic performance for the reduction of 4-nitrophenol.

Cs‐Corrected STEM Imaging of both Pure and Silver‐Supported Metal‐Organic Framework MIL‐100(Fe)

“…The intention was to generate both external Ag 0 (nano)particles or nanoclusters of Ag 0 within the MIL‐100(Fe) cavities. AgNO 3 was deeply mixed with MIL‐100(Fe) using a mortar and pestle and heated up to 150 °C for 12 h. Under these conditions, the Ag species resulted mainly reduced to Ag 0 according to the powder XRD patterns (Figure ) because of the spontaneous reduction of Ag + to Ag 0 as observed in some other MOFs …”

The crystal structure of [(tetra-μ 2-2,6-difluorobenzoato-κ 2 O:O′)-bis-(2,6-difluorobenzoato-κ 2 O:O′)-bis-(1,10-phenanthroline-κ 2 N:N′)]dierbium(III) C66H34N4O12F12Er2

“…In the last two decades, lanthanide complexes have attracted much interest because of their diverse applications as functional materials such as molecular sensors, photo-catalysts and luminescent materials [4]. A key step in the construction of lanthanide complexes is to use appropriate organic ligands.…”

Structural Isomerism of Two Ce‐BTC for Fabricating Pt/CeO2 Nanorods toward Low‐Temperature CO Oxidation

“…[25] In addition, Ln-MOFs can be constructed with adjustable pore sizes/shapes and excellent stability, which can prevent the aggregation of NPs and prolong catalyst longevity in the harsh reaction environment. It is worth mentioning that the NP/Ln-MOFs composites have shown remarkable catalytic activities in many catalytic reactions, such as CO oxidation reaction, [26] hydrogenation of styrene, [27] and reduction of 4-nitrophenol, [28] etc. For instance, Wu et al have developed a new Tb-MOF as support to load Ag NPs, and the obtained Ag/Tb-MOF composite showed outstanding catalytic activity in 4-nitrophenol reduction, with a high reduction rate constant of 2.57 × 10 −2 s −1 .…”