Metal-organic frameworks bearing free carboxylic acids: Preparation, modification, and applications

Two-dimensional dysprosium(III) coordination polymer: Structure, single-molecule magnetic behavior, proton conduction, and luminescence

“…We chose the aromatic ligand 4,6-dioxido-1,3-benzenedicarboxylate (H 4 m-dobdc), and to our knowledge, Dy(III) complexes based on this ligand have been not been reported ( Kapelewski et al, 2018 ; Barnett et al, 2019 ). Carboxyl and phenolic hydroxyl groups have high affinity with Dy(III) ion and diverse coordination modes, and more importantly, they can also act as efficient hydrogen bond acceptors/donors, forming infinite hydrogen bond networks to facilitate proton transport ( Li et al, 2017 ; Wang et al, 2021 ; Bhadra et al, 2022 ). Herein, a two-dimensional (2D) CP [Dy(Hm-dobdc) (H 2 O) 2 ]·H 2 O ( Dy-CP ), was hydrothermal synthesized through the interaction of Dy(III) ion and judiciously selected organic ligands, and its field-induced slow relaxation behavior and proton conduction properties were demonstrated.…”

A Microporous Potassium‐Organic Framework for Efficient C2H2/CO2 Separation

“…[19] Many MOFs materials are composed of transition metals and organic ligands due to their strong metal coordination ability, such as Cr, Mn, Fe, Co, Cu, Zn, etc. [20][21][22][23][24] In contrast, MOFs construct by the first and second main group metals are less reported. [25,26] Alkali and alkaline earth metal-based MOFs have increasingly captured the attention of scientists, because of their non-toxic, huge electronegativity and inexpensive for catalysis.…”

“…Many MOFs materials are composed of transition metals and organic ligands due to their strong metal coordination ability, such as Cr, Mn, Fe, Co, Cu, Zn, etc [20–24] . In contrast, MOFs construct by the first and second main group metals are less reported [25,26] .…”

Geometrically Mismatched Hydrogen‐bonded Framework Composed of Tetratopic Carboxylic Acid

“…The multiple applicability of MOFs is highly dependent on the properties of pristine frameworks and incorporated functional groups or sites, [3] such as uncoordinated nitrogen, [4] halogen, [5] sulfonic acid, [6] and carboxy groups [7] . Particularly, free carboxy groups in MOFs are nonnegligible because of the Brønsted acidity, polarity and binding capacity with organic molecules and metal ions [3] . Free carboxy groups can be obtained in the final structure by adjusting the pH during the synthesis, making the modified MOFs with promising application.…”

“…[7] Particularly, free carboxy groups in MOFs are nonnegligible because of the Brønsted acidity, polarity and binding capacity with organic molecules and metal ions. [3] Free carboxy groups can be obtained in the final structure by adjusting the pH during the synthesis, making the modified MOFs with promising application. For examples, Tian and coworkers reported three-dimensional porous coordination polymers (PCPs) possessing grafted carboxy groups on their pore surface.…”