7 research outputs found

    Yb(OTf)<sub>3</sub>‑Mediated Access to Furans from β‑Ketothioamides via Eschenmoser Sulfide Contraction Reaction

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    A mild and straightforward synthetic protocol for construction of a furan skeleton promoted by Yb­(OTf)<sub>3</sub> from β-ketothioamides and arylglyoxals has been developed at room temperature. Importantly, this protocol involves a tandem sequence that includes aldol condensation, N-cyclization, ring opening, O-cyclization, S-cyclization, and Eschenmoser sulfide contraction

    Tuning Water Sorption in Highly Stable Zr(IV)-Metal–Organic Frameworks through Local Functionalization of Metal Clusters

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    Water adsorption of metal–organic frameworks (MOFs) is attracting intense interest because of their potential applications in atmospheric water harvesting, dehumidification, and adsorption-based heating and cooling. In this work, through using a hexacarboxylate ligand, four new isostructural Zr­(IV)-MOFs (BUT-46F, -46A, -46W, and -46B) with rare low-symmetric 9-connected Zr<sub>6</sub> clusters were synthesized and structurally characterized. These MOFs are highly stable in water, HCl aqueous solution (pH = 1), and NaOH aqueous solution (pH = 10) at room temperature, as well as in boiling water. Interestingly, the rational modification of the metal clusters in these MOFs with different functional groups (HCOO<sup>–</sup>, CH<sub>3</sub>COO<sup>–</sup>, H<sub>2</sub>O/OH, and PhCOO<sup>–</sup>) enables the precise tuning of their water adsorption properties, which is quite important for given application. Furthermore, all four MOFs show excellent regenerability under mild conditions and good cyclic performance in water adsorption

    Tuning Water Sorption in Highly Stable Zr(IV)-Metal–Organic Frameworks through Local Functionalization of Metal Clusters

    No full text
    Water adsorption of metal–organic frameworks (MOFs) is attracting intense interest because of their potential applications in atmospheric water harvesting, dehumidification, and adsorption-based heating and cooling. In this work, through using a hexacarboxylate ligand, four new isostructural Zr­(IV)-MOFs (BUT-46F, -46A, -46W, and -46B) with rare low-symmetric 9-connected Zr<sub>6</sub> clusters were synthesized and structurally characterized. These MOFs are highly stable in water, HCl aqueous solution (pH = 1), and NaOH aqueous solution (pH = 10) at room temperature, as well as in boiling water. Interestingly, the rational modification of the metal clusters in these MOFs with different functional groups (HCOO<sup>–</sup>, CH<sub>3</sub>COO<sup>–</sup>, H<sub>2</sub>O/OH, and PhCOO<sup>–</sup>) enables the precise tuning of their water adsorption properties, which is quite important for given application. Furthermore, all four MOFs show excellent regenerability under mild conditions and good cyclic performance in water adsorption

    Tuning Water Sorption in Highly Stable Zr(IV)-Metal–Organic Frameworks through Local Functionalization of Metal Clusters

    No full text
    Water adsorption of metal–organic frameworks (MOFs) is attracting intense interest because of their potential applications in atmospheric water harvesting, dehumidification, and adsorption-based heating and cooling. In this work, through using a hexacarboxylate ligand, four new isostructural Zr­(IV)-MOFs (BUT-46F, -46A, -46W, and -46B) with rare low-symmetric 9-connected Zr<sub>6</sub> clusters were synthesized and structurally characterized. These MOFs are highly stable in water, HCl aqueous solution (pH = 1), and NaOH aqueous solution (pH = 10) at room temperature, as well as in boiling water. Interestingly, the rational modification of the metal clusters in these MOFs with different functional groups (HCOO<sup>–</sup>, CH<sub>3</sub>COO<sup>–</sup>, H<sub>2</sub>O/OH, and PhCOO<sup>–</sup>) enables the precise tuning of their water adsorption properties, which is quite important for given application. Furthermore, all four MOFs show excellent regenerability under mild conditions and good cyclic performance in water adsorption

    Tuning Water Sorption in Highly Stable Zr(IV)-Metal–Organic Frameworks through Local Functionalization of Metal Clusters

    No full text
    Water adsorption of metal–organic frameworks (MOFs) is attracting intense interest because of their potential applications in atmospheric water harvesting, dehumidification, and adsorption-based heating and cooling. In this work, through using a hexacarboxylate ligand, four new isostructural Zr­(IV)-MOFs (BUT-46F, -46A, -46W, and -46B) with rare low-symmetric 9-connected Zr<sub>6</sub> clusters were synthesized and structurally characterized. These MOFs are highly stable in water, HCl aqueous solution (pH = 1), and NaOH aqueous solution (pH = 10) at room temperature, as well as in boiling water. Interestingly, the rational modification of the metal clusters in these MOFs with different functional groups (HCOO<sup>–</sup>, CH<sub>3</sub>COO<sup>–</sup>, H<sub>2</sub>O/OH, and PhCOO<sup>–</sup>) enables the precise tuning of their water adsorption properties, which is quite important for given application. Furthermore, all four MOFs show excellent regenerability under mild conditions and good cyclic performance in water adsorption

    Zr(IV)-Based Metal-Organic Framework with T‑Shaped Ligand: Unique Structure, High Stability, Selective Detection, and Rapid Adsorption of Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> in Water

    No full text
    Dichromate is known for severe health impairments to organisms. New and valid strategies have been developed to rapidly detect and efficiently remove this pollutant. Constructing stable luminescent metal-organic frameworks (MOFs) for dichromate recognition and removal from aqueous solution could provide a feasible resolution to this problem. Herein, a new luminescent Zr­(IV)-MOF, Zr<sub>6</sub>O<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>3</sub>(BTBA)<sub>3</sub> (BUT-39, BUT = Beijing University of Technology) was constructed through the reaction of a newly designed functionalized T-shaped ligand 4,4′,4″-(1<i>H</i>-benzo­[<i>d</i>]­imidazole-2,4,7-triyl)­tribenzoic acid (H<sub>3</sub>BTBA) with zirconium salt. BUT-39 has a unique porous framework structure, in which Zr<sub>6</sub> cluster acts as a rare low-symmetric 9-connected node and BTBA<sup>3–</sup> as a T-shaped 3-connected linker. As far as we know, this represents the first case of a (3,9)-connected Zr­(IV)-MOF. BUT-39 could retain its framework integrity in boiling water, 2 M HCl aqueous solution, and pH 12 NaOH aqueous solution. Due to its good water stability and strong fluorescent emission, BUT-39 is then employed in fluorescence sensing for various ions in aqueous solution and shows good performance toward Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> selectively, at a low concentration and a short response time (<1 min). Simultaneously, it also exhibits excellent capacity to rapidly capture Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> (within 1 min) with a high uptake up to 1 mmol g<sup>–1</sup>. Taking advantage of its excellent stability, sensitive and selective sensing, as well as rapid and high adsorption, BUT-39 is expected to be useful in Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> detection in and removal from water

    Zr(IV)-Based Metal-Organic Framework with T‑Shaped Ligand: Unique Structure, High Stability, Selective Detection, and Rapid Adsorption of Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> in Water

    No full text
    Dichromate is known for severe health impairments to organisms. New and valid strategies have been developed to rapidly detect and efficiently remove this pollutant. Constructing stable luminescent metal-organic frameworks (MOFs) for dichromate recognition and removal from aqueous solution could provide a feasible resolution to this problem. Herein, a new luminescent Zr­(IV)-MOF, Zr<sub>6</sub>O<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>3</sub>(BTBA)<sub>3</sub> (BUT-39, BUT = Beijing University of Technology) was constructed through the reaction of a newly designed functionalized T-shaped ligand 4,4′,4″-(1<i>H</i>-benzo­[<i>d</i>]­imidazole-2,4,7-triyl)­tribenzoic acid (H<sub>3</sub>BTBA) with zirconium salt. BUT-39 has a unique porous framework structure, in which Zr<sub>6</sub> cluster acts as a rare low-symmetric 9-connected node and BTBA<sup>3–</sup> as a T-shaped 3-connected linker. As far as we know, this represents the first case of a (3,9)-connected Zr­(IV)-MOF. BUT-39 could retain its framework integrity in boiling water, 2 M HCl aqueous solution, and pH 12 NaOH aqueous solution. Due to its good water stability and strong fluorescent emission, BUT-39 is then employed in fluorescence sensing for various ions in aqueous solution and shows good performance toward Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> selectively, at a low concentration and a short response time (<1 min). Simultaneously, it also exhibits excellent capacity to rapidly capture Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> (within 1 min) with a high uptake up to 1 mmol g<sup>–1</sup>. Taking advantage of its excellent stability, sensitive and selective sensing, as well as rapid and high adsorption, BUT-39 is expected to be useful in Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> detection in and removal from water
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