Metal–Organic Framework-Based Selective Molecular Recognition of Organic Amines and Fixation of CO₂ into Cyclic Carbonates

Abstract

Synthesis and structural depiction of two new metal−organic frameworks ( M O F s ) , n a m e l y , [ { Z n ( L ) ( o b a ) }and 5-H 2 nipa = 5-nitroisophthalic acid) are reported. Both Zn-MOF-1 and Cd-MOF-2 have been prepared by reacting ligand L and coligand 4,4′-H 2 oba or 5-H 2 nipa with the respective dihydrates of Zn(OAc) 2 and Cd(OAc) 2 (OAc = acetate). Crystal structure Xray analysis discloses that Zn-MOF-1 displays an overall 2D → 3D interpenetrated framework structure. The topological analysis by ToposPro suggests a (4)-connected uninodal sql topology with a point symbol of {4 4 •6 2 } having 2D + 2D parallel polycatenation. However, crystal packing of Cd-MOF-2 adapted a porous framework architecture and was topologically simplified as (3,4)-connected binodal 2D net. In addition, both Zn-MOF-1 and Cd-MOF-2 were proved to be multifunctional materials for the recognition of organic amines and in the fixation of CO 2 to cyclic carbonates. Remarkably, Zn-MOF-1 and Cd-MOF-2 showed very good fluorescence stability in aqueous media and have shown 98 and 97% quenching efficiencies, respectively, for 4aminobenzoic acid (4-ABA), among all of the researched amines. The mechanistic study of organic amines recognition proposed that fluorescence quenching happened mainly through hydrogen-bonding and π−π stacking interactions. Additionally, cycloaddition of CO 2 to epoxide in the presence of Zn-MOF-1 and Cd-MOF-2 afforded up to 96% of cyclic carbonate within 24 h. Both Zn-MOF-1 and Cd-MOF-2 exhibited recyclability for up to five cycles without noticing an appreciable loss in their sensing or catalytic efficiency.

Phytogenically bioengineered metal nanoarchitecture for degradation of refractory dye water pollutants: A pragmatic minireview

“…TON is defined as the number of substrate moles that 1 mol of catalyst can convert into products, whereas TOF is simply computed as TON/reaction time. [ 162,212–230 ]…”

“…TON is defined as the number of substrate moles that 1 mol of catalyst can convert into products, whereas TOF is simply computed as TON/reaction time. [162,[212][213][214][215][216][217][218][219][220][221][222][223][224][225][226][227][228][229][230] For example, My-Thao and his coworkers [162] biogenically synthesized Au and Ag NPs using waste Passiflora edulis fruit peels. The green spherical NPs were evaluated for catalytic activity against four common dye pollutants (MO, EY, Rh6G, and RhB).…”

A highly robust cluster-based indium(iii)–organic framework with efficient catalytic activity in cycloaddition of CO2 and Knoevenagel condensation

“…On the other hand, although a series of indium(III)-based MOFs have been reported, few have the nanoporous structure, which should be ascribed to the fact that the large ionic radius and the d 10 electronic configuration of In 3+ tend to result in coordination diversity. [25][26][27] Therefore, it remains a challenge to realize the construction of solventaccessible cluster-based metal-organic frameworks with In 3+ as a constituent element.…”

Multifunctional Eu3+‐coordination polymer for highly selective recognition of Fe3+ and MnO4− ions in water and efficient catalytic fixation of carbon dioxide

“…[41][42][43][44][45][46][47] These chemicals have been widely applied as aprotic polar solvents, lithium batteries, and chemical intermediates for the synthesis of chemicals. [48][49][50] So far, various homogeneous (such as phosponium salts [51,52] and ionic liquids [53,54] ) and heterogeneous catalysts (such as metal oxides, [55,56] covalent organic frameworks [COFs], [57,58] and CPs [45][46][47][59][60][61][62][63][64] ) have been explored for the cycloaddition of CO 2 with epoxides. Among these, CPs with high-density coordinationunsaturated metal sites are conducive to the fixation of CO 2 , which has attracted extensive attention.…”