A Multimodal Ratiometric Luminescent Thermometer Based on a Single-Dysprosium Metal-Organic Framework.

The design of high-performance luminescent MOF thermometers with multi-operation modes has been long sought but remains a formidable challenge. In this work, for the first time, we present a multimodal luminescent ratiometric thermometer based on the single-lanthanide metal-organic framework (MOF) DyTPTC-2Me (HTPTC-2Me = 2',5'-dimethyl-[1,1':4',1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid). It not only has the characteristic luminescence of Dy in which the atomic transitions from the I and F states (thermally coupled energy levels, TCELs) are included but also emits ligand fluorescence due to the efficient energy back-transfer of Dy to the ligand, thus allowing accurate non-invasive determination of temperature by different modes.

Amino-Functionalized Single-Lanthanide Metal-Organic Framework as a Ratiometric Fluorescent Sensor for Quantitative Visual Detection of Fluoride Ions.

Excessive content of fluoride ions (F) in water will lead to water pollution and endanger human health, so the research on the method of low-cost, rapid, and efficient detection of F is of particular significance. In this work, an amino-functionalized ligand with an appropriate triplet energy excited state, 2'-amino-[1,1':4',1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid (HTPTC-NH), was selected to construct a luminescent single-lanthanide metal-organic framework, EuTPTC-NH, with uncoordinated amino groups for the detection of F. Based on host-guest interactions, that is, hydrogen bonds formed between the free amino groups and F ions, EuTPTC-NH was developed as a ratiometric fluorescence probe for F detection with good anti-interference ability, low detection limit, high water stability, and selectivity.

Water-Stable Eu-Cluster-Based fcu-MOF with Exposed Vinyl Groups for Ratiometric and Fluorescent Visual Sensing of Hydrogen Sulfide.

Detection of HS in the biological system has attracted enormous attention in recent years. In this work, a new vinyl-functionalized metal-organic framework (MOF), [(MeNH)] [Eu(μ-OH)(BDC-CH═CH)(HO)] (Eu-BDC-CH═CH, BDC-CH═CH = 2-vinylterephthalic acid), was synthesized under solvothermal conditions. The vinyl groups in the ligands can not only modulate the "antenna effect" of the ligand on Eu ions but also serve as an exposed reactive site to allow for the quantitative detection of HS by Eu-BDC-CH═CH.

Recent progress on porous MOFs for process-efficient hydrocarbon separation, luminescent sensing, and information encryption.

Metal-organic frameworks (MOFs), as an emerging class of porous materials, excel in designability, regulatability, and modifiability in terms of their composition, topology, pore size, and surface chemistry, thus affording a huge potential for addressing environment and energy-related challenges. In particular, MOFs can be applied as porous adsorbents for the purification of industrially important hydrocarbons through certain process-efficient separation schemes based on selectivity-reversed adsorption and multicomponent separation. Moreover, the vast combination possibilities and controllable and engineerable luminescent units of MOFs make them a versatile platform to develop functionally tailored materials for luminescent sensing and optical data encryption.