Tailoring chirality and porosity in metal-organic frameworks for efficient enantioselective recognition

Self Cite

Phenolic organic compounds are widely used industrial chemicals that exist extensively in the environment and have a significant impact on human health. 4-Nitrophenol (4-NP) is a typical phenolic organic compound found in aqueous environments. Efficient detection of 4-NP in wastewater is highly challenging due to the complexity of testing environmental samples. Herein, a luminescent lanthanide metal–organic framework (MOF) sensor based on the Eu3+ ion {[Eu(HL)(L)(H2O)]·2H2O} n (EuMOF; H2L = 5-(4H-1,2,4-triazol-4-yl)benzene-1,3-dicarboxylic acid) was successfully synthesized for efficient 4-NP detection in wastewater. Fluorescence sensing experiments revealed that 4-NP could greatly quench the EuMOF fluorescence. Subsequently, EuMOF was applied to 4-NP detection in distilled water, tap water, river water, and treated industrial wastewater, exhibiting high sensitivity, a fast response within 30 s, high selectivity, excellent reusability, and a low detection limit. Finally, the fluorescence quenching mechanism was explored and attributed to competitive absorption of irradiated light between 4-NP and the ligand.

Section: Resultsmentioning

confidence: 99%

Selective and Rapid Detection of 4-Nitrophenol in River and Treated Industrial Wastewater by a Luminescent Lanthanide Metal–Organic Framework Sensor

Yang,

Chen,

et al. 2023

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“…Heavy metals invade the human body through not only the diet but also the skin, which poses a serious risk to human health. Therefore, the development of smart sensors that can respond quickly to low concentrations of heavy metal ions is essential. − To evaluate the response sensitivity of PyraTb for Co(II), Cu(II), Fe(III), Mn(II), Ni(II), and Zn(II) ions, solutions containing these ions were added to an CH 3 CN solution containing PyraTb , the luminescence was recorded under the optimized conditions, and the LOD for the ions was calculated. Specifically, samples of 10, 30, 60, 100, 150, 200, 300, and 350 μL of an aqueous solution of Co(II) at a concentration of 35 nM were accurately pipetted into a CH 3 CN solution containing 3 mL of PyraTb .…”

Section: Resultsmentioning

confidence: 99%

Aggregation-Induced Emission via the Restriction of the Intramolecular Vibration Mechanism of Pinacol Lanthanide Complexes

Ai,

Li,

Wang

et al. 2023

Pinacol lanthanide complexes PyraLn (Ln = Dy and Tb) with the restriction of intramolecular vibration were obtained for the first time via an in situ solvothermal coordination-catalyzed tandem reaction using cheap and simple starting materials, thereby avoiding complex, time-consuming, and expensive conventional organic synthesis strategies. A high-resolution electrospray ionization mass spectrometry (HRESI-MS) analysis confirmed the stability of PyraLn in an organic solution. The formation process of PyraLn was monitored in detail using time-dependent HRESI-MS, which allowed for proposing a mechanism for the formation of pinacol complexes via in situ tandem reactions under one-pot coordination-catalyzed conditions. The PyraLn complexes constructed using a pinacol ligand with a butterfly configuration exhibited distinct aggregation-induced emission (AIE) behavior, with the αAIE value as high as 60.42 according to the AIE titration curve. In addition, the PyraLn complexes in the aggregated state exhibit a rapid photoresponse to various 3d metal ions with low detection limits. These findings provide fast, facile, and high-yield access to dynamic, smart lanthanide complex emissions with bright emission and facilitate the rational construction of molecular machines for artificial intelligence.

“…The formation of a multinuclear cluster is a good way to solve the above problem . MOFs with multinuclear secondary building units (SBUs) can improve the diversity of the structure and the pore aperture due to the large spatial size of cluster nodes. , In addition, from the perspective of the applications, MOFs with larger cavities and pore volumes have a broad prospect as gas storage, drug molecular recognition, and sensing. − In addition, the multinuclear SBUs provide rigid connection nodes and make an important contribution to the structure design through variable connection mode, size, and orientation, becoming a more common way to build new MOFs . Meanwhile, the unsaturated coordination of metal clusters not only provides the possibility for the post-modification of MOFs by metals or ligands but also serves as the adsorption sites, which have strong affinity for catalytic substrates or gas molecules, enriching the catalysis, adsorption, and separation performance.…”

Section: Introductionmentioning

confidence: 99%

Development of a Mixed Multinuclear Cluster Strategy in Metal–Organic Frameworks for Methane Purification and Storage

Lei,

Yuan,

Shang

et al. 2023

Metal−organic frameworks (MOFs) have attracted extensive attention in methane (CH 4 ) purification and storage. Specially, multinuclear cluster-based MOFs usually have prominent performance because of large cluster size and abundant open metal sites. However, compared to diverse combinations of organic linkers, one MOF with two or more multinuclear clusters is difficult to achieve. In this paper, we demonstrate a mixed multinuclear cluster strategy, which successfully led to three new heterometallic MOFs (SNNU-328−330) with the same common H 3 TATB [2,4,6-tris(4-carboxyphenyl)-1,3,5triazine] tritopic linker and six types of multinuclear clusters ([YCd(COO) ). Three MOF adsorbents all show great potentials to remove the impurities (CO 2 and C 2 -hydrocarbons) in natural gas and show prominent high-pressure methane storage capacity. Among them, the ideal adsorbed solution theory separation ratios of equimolar C 2 H 2 /CH 4 , C 2 H 4 /CH 4 , C 2 H 6 /CH 4 , and CO 2 /CH 4 at 298 K for SNNU-328 reach to 29.7−16.0, 19.1−8.2, 33.2−10.3, and 74.3−8.5, which have surpassed many famous MOF adsorbents. Dynamic breakthrough experiments conducted at 273 and 298 K showed that SNNU-330 can separate CH 4 from C 2 H 2 /CH 4 , C 2 H 4 /CH 4 , C 2 H 6 /CH 4 , and CO 2 /CH 4 mixtures with the breakthrough interval times of about 48.2, 17.9, 37.2, and 17.1 min g −1 (273 K, 1 bar, v/v = 50/50, 2 mL min −1 ), respectively. Remarkably, SNNU-329 exhibits extremely high methane storage performance at 298 K with the total uptake and working capacity of 192 cm 3 cm −3 (95 bar) and 171 cm 3 cm −3 (65 bar) due to the synergistic effects of high surface area, suitable pore sizes, and multiple open metal sites.