Lanthanide–Potassium Biphenyl-3,3′-disulfonyl-4,4′-dicarboxylate Frameworks: Gas Sorption, Proton Conductivity, and Luminescent Sensing of Metal Ions

Abstract

A novel sulfonate-carboxylate ligand of biphenyl-3,3'-disulfonyl-4,4'-dicarboxylic acid (H4-BPDSDC) and its lanthanide-organic frameworks {[LnK(BPDSDC)(DMF)(H2O)]·x(solvent)}n (JXNU-2, where JXNU denotes Jiangxi Normal University, DMF indicates dimethylformamide, and Ln = Sm(3+), Eu(3+), and Pr(3+)) were synthesized and structurally characterized. The three isomorphous lanthanide compounds feature three-dimensional frameworks constructed from one-dimensional (1D) rod-shaped heterometallic Ln-K secondary building units and are an illustration of a Kagome-like lattice with large 1D hexagonal channels and small 1D trigonal channels. The porous material of the representive JXNU-2(Sm) has an affinity to quadrupolar molecules such as CO2 and C2H2. In addition, the JXNU-2(Sm) compound exhibits humidity- and temperature-dependent proton conductivity with a large value of 1.11 × 10(-3) S cm(-1) at 80 °C and 98% relative humidity. The hydrophilic sulfonate group on the surface of channels facilitates enrichment of the solvate water molecules in the channels, which enhances the proton conductivity of this material. Moreover, the JXNU-2(Eu) material with the characteristic bright red color shows the potential for recognition of K(+) and Fe(3+) ions. The enhancing Eu(3+) luminescence with the K(+) ion and quenching Eu(3+) luminescence with the Fe(3+) ion can be associated with the functional groups of the organic ligand.

Luminescence-colour-changing sensing of Mn2+ and Ag+ ions based on a white-light-emitting lanthanide coordination polymer

“…PXRD patterns of complex 4 measured after sensing of Ag + and Mn 2+ are nearly identical to those of the as-synthesized complex, indicating that the LCC phenomenon is not related to crystallographic alteration (Fig. 19 Two factors may support the interactions: (1) Ag + or Mn 2+ ions could form a cation-p interaction with the phenyl of the ligand in the 1D pseudochannels; 20 (2) the existence of the functional sites (open oxygen sites) in the polymers could produce highly selective recognition of the analytes. The luminescence lifetime of Ag + @4 in DMF/water solution (Ag + : 4 = 1 : 1, 0.01 M) dramatically decreases, indicating the existence of interactions between analytes and sensor (Table S3, ESI †).…”

An Uncommon Carboxyl‐Decorated Metal–Organic Framework with Selective Gas Adsorption and Catalytic Conversion of CO2

“…Carboxylate ligandsa nd azolate ligands represent the most classic ligands owing to the multivariate coordination modes for the former and the rigid coordination bonds for the latter with variousm etal ions. [33] Thus,as ymmetrical 4,6-bis(triazol-1-yl)isophthalic acid (H 2 btzip) ligand combining the advantages of carboxylate and azolate groups has been designed,w hich not only tends to form stable porous MOFs but also facilitates the adsorption for CO 2 as ar esult of the existence of multiple Lewis basic nitrogen atoms. Herein, the reaction of nickel wire and H 2 btzip unders olvothermalc onditions afforded ah ighly porous threedimensional (3D) MOF,[ Ni(btzip)(H 2 btzip)]·2 DMF·2 H 2 O (1).…”

Improving the performance of sulfonated polymer membrane by using sulfonic acid functionalized hetero‐metallic metal‐organic framework for DMFC applications

“…The linker biphenyl‐3,3′‐disulfonyl‐4,4′‐dicarboxylic acid contains some K + ions as the impurity, which attached to the secondary building unit during the MOF preparation. At 80°C, JXNU‐2 displayed proton conductivity of 0.0011 S cm −1 . Even though some hetero‐metallic MOF were reported, but none of them compared the proton‐conducting properties of single metal and hetero‐metal MOF so far.…”

“…At 80 C, JXNU-2 displayed proton conductivity of 0.0011 S cm −1 . 37 Even though some hetero-metallic MOF were reported, 16 but none of them compared the protonconducting properties of single metal and hetero-metal MOF so far. Moreover, no hetero-metallic MOF/polymer composite membranes have been reported yet.…”