Stable Indium-Pyridylcarboxylate Framework: Selective Gas Capture and Sensing of Fe³⁺ Ion in Water

Abstract

By employing a pyridyl-decorated dicarboxylic acid ligand, 3-(2′,5′-dicarboxylphenyl)­pyridine acid (H2dcpy), a three-dimensional In3+-based metal–organic framework, H3O­[In3(dcpy)4(OH)2]·3DMF·4H2O (1), with a good chemical stability toward acid and base has been synthesized. The compound 1 shows an uncommon (3,8)-connected tfz-d; UO3 topological net based on linear In3(COO)4(OH)2 clusters and also contains one-dimensional open channels. Particularly, 1 contains two types of dcpy2– linkers, in which the pyridyl group in one participates in coordination with the In3+ ion, whereas that in the other is uncoordinated but hangs in the inner sides of the channels as functionalized sites. Gas adsorption experiments demonstrate that 1 is able to selectively adsorb C2H2, C2H4, and CO2 over CH4. Simultaneously, 1 shows a highly selective and sensitive fluorescence detection toward Fe3+ ion in water with good recyclability.

Recent Advances in Nanocomposite Luminescent Metal-Organic Framework Sensors for Detecting Metal Ions

“…Several MOFs involving metals with ns or np valence electrons have been reported as luminescence sensors for metal ion detection. [249][250][251][252][253][254][255][256][257] For example, a series of luminescent MOFs involving tri-or tetravalent metal ions (Al 3+ , Zr 4 + , Cr 3+ , Fe 3+ , and Ti 4+ ) were synthesized and screened for simultaneous detection and removal of mercuric ions. [249] The Al-based MOF exhibited an excellent ability for Hg 2+ detection with wide response interval (1 −17.3 μM), low detection limit (0.15 μM), good selectivity, and wide pH adaptation (4.0−10.0).…”

“…This detection was applied to the determination of Fe 3+ ions in human urine samples with quantitative spike recoveries ranging from 98.2% to 106.2%. [256] Recently, a three-dimensional In 3+ -based metal−organic framework, [In 3 (dcpy) 4 (OH) 2 ]•3DMF•4H 2 O where H 2 dcpy is 3-(2′,5′dicarboxylphenyl)pyridine with a good chemical stability toward acids and bases, showed a highly selective and sensitive fluorescence detection toward Fe 3+ ions in water with good recyclability [257] .…”

Improvement of two Mn2+ coordination polymers on cognitive function of aged rats after anesthesia

“…It has been proved that there exists a complex series of aspects affecting the structures of CPs, such as the structure of organic ligands, the types of the metal ions, the polarity of solvents the pH value, the reaction time, the reaction temperature, and so on [ 8–12 ]. Furthermore, diversified kinds of weak intermolecular interactions, such as H-bonding, π–π packing, metal–metal interactions and so on, are momentous in the course of self-assembly [ 13–16 ]. In addition, because of the variety of connecting patterns and high frame stability, polycarboxylate (benzene-tribenzoate, dicarboxylate and biphenyl tetra-car-box-yl-ate) and N heterocyclic (triazole, imidazole and their derivatives) ligands have been conducted widely as chelating or bridging connectors [ 17–20 ].…”

Sieving Effect for the Separation of C2H2/C2H4 in an Ultrastable Ultramicroporous Zinc‐Organic Framework

“…Furthermore, the common solvents used in the synthesis of ultramicropore MOFs are organic solvents, including DMF, DMA, DEF, and etc., while water as a synthetic solvent can be more environmentally friendly. Continuing with our study on the microporous MOFs based on asymmetric pyridinecarboxylic acid ligands, [21,22] the mixed 3‐(2′,5′‐dicarboxylphenyl)pyridine (H 2 dcpy) and 1,2‐di(4‐pyridyl)ethylenes (bpe) were selected to construct the target framework as the following considerations: 1) the low symmetry of dcpy tends to form microporous structure with small opening size which is beneficial for gas separation; 2) the addition of the linear bpe linkers are helpful to the formation of interpenetrating structures, which makes the framework more stable. Herein, a 2‐fold interpenetrated zinc‐based MOF, [Zn(dcpy)(bpe) 0.5 ] ⋅ 3H 2 O ( 1 ), was selected to study its separation of small hydrocarbons based on its ultramicropore.…”