Effect of structural variation on enzymatic activity in tetranuclear (Cu<sub>4</sub>) clusters with defective cubane core

Khan, M. Shahnawaz; Khalid, Mohd; Kamal, Samrah; Shahid, M.; Ahmad, Musheer

doi:10.1080/07391102.2021.1924263

Cited by 8 publications

(7 citation statements)

References 63 publications

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“…The two 4,7-Phen moieties outside the coordination sphere are monoprotonated, thus making the MOF unit anionic in nature. The one dianion [Mn 3 (FDA) 6)°; these angles define the direction of distortion because it deviates from the linearity (180°) angle, 52 whereas the Mn2 center is six-coordinated with six carboxylate O atoms of six different FDA 2− ligands. In contrast, the Mn2 center adopts a regular octahedral coordination geometry as illustrated in Figure 2b.…”

Section: Resultsmentioning

confidence: 99%

“…The one dianion [Mn 3 (FDA) 4 (H 2 O) 2 ] 2– is counterbalanced by two cationic rings [H-Phen] + . The Mn1–O bond distance ranges from 2.107(16) to 2.416(16) Å, and the important bond angles around the Mn1 atom are obtained as O5–Mn1–O1 = 170.96(6)°, O6–Mn1–O10 = 162.59(6)°, and O9–Mn1–O11 = 154.83(6)°; these angles define the direction of distortion because it deviates from the linearity (180°) angle, whereas the Mn2 center is six-coordinated with six carboxylate O atoms of six different FDA 2– ligands. In contrast, the Mn2 center adopts a regular octahedral coordination geometry as illustrated in Figure b.…”

Section: Resultsmentioning

confidence: 99%

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Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d¹⁰ Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Kamal

Khalid

Khan

et al. 2022

Crystal Growth & Design

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In this work, a Mn-based metal−organic framework (MOF) {[H-Phen] 2 [Mn 3 (FDA) 4 (H 2 O) 2 ]•2H 2 O} n (SM-1) has been synthesized solvothermaly using 2,5-furandicarboxylic acid (2,5-FDA) as a linker and 4,7-phenanthroline (4,7-Phen) as a coligand. SM-1 was characterized using elemental analysis, Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (PXRD), and crystallographic studies. Single-crystal X-ray data reveal that the SM-1 framework is constituted by trinuclear Mn secondary building units (SBUs) as a dianion ([Mn 3 (COO) 6 ] 2− ), 2,5-FDA, and free 4,7-phenanthrolinium cation [H-Phen] + rings containing uncoordinated amino and imino moieties, which provide extra stability to the framework and feasible recognition sites to interact with analytes. Overall, the MOF is anionic in nature, which is counterbalanced by two protonated phenanthrolinium cations, thus giving rise to +2 oxidation states for all three Mn ions. Topological analysis shows that SM-1 has a {4 4 .6 2 } point symbol having a 4-c uninodal net with sql topology. SM-1 is an excellent fluorescent sensor for d 10 heavy metal ions in an aqueous environment. SM-1 developed as a highly sensitive sensor exhibits a fluorescence "turn-on" response for Ag + and Cd 2+ ions and a fluorescence "turn-off" response in the case of Hg 2+ ion with much lower limit of detection (LOD) values. Moreover, SM-1 application is not limited to only sensing, but it can also serve as an adsorbent to capture hazardous substances. Owing to the presence of π-electron-rich moieties and uncoordinated nitrogen atoms in the SM-1 framework, it is also explored for efficient iodine uptake. SM-1 captures iodine reversibly in cyclohexane solution with high adsorption capacity within 36 h. Further, a plausible mechanism of sensing and iodine adsorption was also discussed briefly. As far as we know, this is the first example of a Mn-based anionic MOF functioning as a fluorescent chemosensor to simultaneously detect d 10 heavy metal ions in water and as an adsorbent to trap iodine. Thus, metal− organic chemistry has been employed to develop multifunctional MOF material for the sensing of hazardous metal ions and as an adsorbent for the removal of toxic iodine.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d¹⁰ Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Kamal

Khalid

Khan

et al. 2022

Crystal Growth & Design

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“…Minor quantities of silicon (1.1%), calcium (0.8%), sulfur (0.2%), sodium (0.2%), and magnesium (0.2%) were also detected. Overall, the sample predominantly consists of carbon and oxygen, with only a minor fraction of atoms belonging to elements other than C, O, and N, typically attributed to plant samples [ 41 ]. Consequently, calcium (Ca) and magnesium (Mg) might be integral to the active components within the structures facilitating CO 2 absorption in the bryophyte.…”

Section: Resultsmentioning

confidence: 99%

Bryophyte-Bioinspired Nanoporous AAO/C/MgO Composite for Enhanced CO2 Capture: The Role of MgO

Cortés-Valadez,

Baños-López,

Hernández-Rodríguez

et al. 2024

Nanomaterials

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A composite material composed of anodized aluminum oxide (AAO), carbon (C), and magnesium oxide (MgO) was developed for CO2 capture applications. Inspired by the bryophyte organism, the AAO/C/MgO composite mirrors two primary features of these species—(1) morphological characteristics and (2) elemental composition—specifically carbon, oxygen, and magnesium. The synthesis process involved two sequential steps: electroanodization of aluminum foil followed by a hydrothermal method using a mixture of glucose and magnesium chloride (MgCl2). The concentration of MgCl2 was systematically varied as the sole experimental variable across five levels—1 mM, 2 mM, 3 mM, 4 mM, and 5 mM—to investigate the impact of MgO formation on the samples’ chemical and physical properties, and consequently, their CO2 capture efficiency. Thus, scanning electron microscopy analysis revealed the AAO substrate’s porous structure, with pore diameters measuring 250 ± 30 nm. The growth of MgO on the AAO substrate resulted in spherical structures, whose diameter expanded from 15 nm ± 3 nm to 1000 nm ± 250 nm with increasing MgCl2 concentration from the minor to major concentrations explored, respectively. X-ray photoelectron spectroscopy (XPS) analysis indicated that carbon serves as a linking agent between AAO and MgO within the composite. Notably, the composite synthesized with a 4 mM MgCl2 concentration exhibited the highest CO2 capture efficiency, as determined by UV-Vis absorbance studies using a sodium carbonate solution as the CO2 source. This efficiency was quantified with a ‘k’ constant of 0.10531, significantly higher than those of other studied samples. The superior performance of the 4 mM MgCl2 sample in CO2 capture is likely due to the optimal density of MgO structures formed on the sample’s surface, enhancing its adsorptive capabilities as suggested by the XPS results.

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“…MOFs are a group of crystalline, porous materials constructed from two types of primary units, an organic ligand, and a metal cluster. 21,[67][68][69] Under suitable synthesis conditions, researchers have developed various MOFs for applications ranging from gas storage, photocatalysis, and energy storage (Fig. 2).…”

Section: Metal-organic Framework (Mofs) In CDImentioning

confidence: 99%

A mini review on metal–organic framework-based electrode materials for capacitive deionization

Khan,

Leong,

et al. 2023

Nanoscale

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Effect of structural variation on enzymatic activity in tetranuclear (Cu₄) clusters with defective cubane core

Cited by 8 publications

References 63 publications

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d¹⁰ Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d¹⁰ Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Bryophyte-Bioinspired Nanoporous AAO/C/MgO Composite for Enhanced CO2 Capture: The Role of MgO

A mini review on metal–organic framework-based electrode materials for capacitive deionization

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Effect of structural variation on enzymatic activity in tetranuclear (Cu4) clusters with defective cubane core

Cited by 8 publications

References 63 publications

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d10 Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d10 Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Bryophyte-Bioinspired Nanoporous AAO/C/MgO Composite for Enhanced CO2 Capture: The Role of MgO

A mini review on metal–organic framework-based electrode materials for capacitive deionization

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Product

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Effect of structural variation on enzymatic activity in tetranuclear (Cu₄) clusters with defective cubane core

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d¹⁰ Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine

Amine- and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d¹⁰ Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine