Construction of a Dual-Functionalized Acid–Base Nanocatalyst via HEPES Buffer Functionalized on Fe₃O₄ as a Reusable Catalyst for Annulation Reactions

Langmuir, Год журнала: 2024, Номер 40(26), С. 13397 - 13411

Опубликована: Июнь 20, 2024

Herein, we present a highly efficient dual-functionalized acid–base nanocatalyst, denoted as Fe3O4@GLYMO-HEPES, featuring sulfuric acid and tertiary amines its dual functional components. This catalyst is synthesized through the immobilization of 4-(2-hydroxyethyl)-1-piperazineethanesulfonic (HEPES) source these functionalities onto magnetite (Fe3O4) using 3-glycidoxypropyltriethoxysilane (GLYMO) linker. Characterization studies confirm integrity Fe3O4 core, with GLYMO-HEPES coating exhibiting no phase changes. Furthermore, Fe3O4@GLYMO-HEPES nanoparticles demonstrate uniform size distribution without aggregation. Notably, exhibits remarkable stability up to 200 °C possesses saturation magnetization value 31.5 emu/g, facilitating easy recovery via magnetic separation. These findings underscore potential versatile recyclable nanocatalyst for various applications. Its catalytic ability was evaluated in synthesis pyrano[2,3-c]pyrazoles 2-amino-3-cyano-4H-chromenes tandem Knorr–Knoevenagel–Michael–Thorpe–Ziegler-type heterocyclization mechanism, different aldehydes. A wide range fused heterocycles having good excellent yields. The process cost-effective, safe, sustainable, scalable, can be reused five times. prepared found stable heterogeneous showed recyclability.

Язык: Английский

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Nanoporous {Co3}-Organic framework for efficiently seperating gases and catalyzing cycloaddition of epoxides with CO2 and Knoevenagel condensation

Journal of Colloid and Interface Science, Год журнала: 2023, Номер 656, С. 127 - 136

Опубликована: Ноя. 17, 2023

Язык: Английский

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Multifunctional Dysprosium(III)–Organic Framework for Efficiently Catalyzing the Cycloaddition of CO₂ and Knoevenagel Condensation under Mild Conditions

ACS Sustainable Chemistry & Engineering, Год журнала: 2023, Номер 11(50), С. 17837 - 17848

Опубликована: Дек. 6, 2023

Two-dimensional (2D) materials with higher order in-plane nanoscale pores play a crucial role in innumerable applications, but their precise and reasonable preparation remains huge challenge. Herein, we report the highly robust 2D dysprosium(III)–organic framework {[Dy(H2BDTP)(DMF)2]·2DMF·3H2O}n (NUC-101) (15.2 × 6.4 Å2) (H5BDTP = 2,6-bis(2,4-dicarboxyphenyl)-4-(2H-tetrazol-5-yl)pyridine). After activation, scarcely reported host [Dy2(H2BDTP)2]n is of great interest due to that it not only contains voids 15.2 11.7 Å3 also functionalized by free carboxyl, pyridinyl, tetrazolyl groups upper lower parts. Thanks excellent physicochemical properties including omnidirectional opening pores, ultrahigh porosity, larger specific surface area, plentiful coexisting Lewis acid–base sites open dinuclear Dy3+ ions, groups, cycloaddition CO2 epoxides Knoevenagel condensation malonitrile aldehydes can be efficiently catalyzed NUC-101a under comparatively mild conditions high selectivity turnover frequency. This work provides valuable insight development nanoporous more feasible for achieving goal catalytic applications.

Язык: Английский

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Bifunctional two-dimensional copper-organic framework for high catalytic performance on cycloaddition of CO2 with epoxides and deacetalization-Knoevenagel condensation

Journal of Molecular Structure, Год журнала: 2024, Номер 1306, С. 137849 - 137849

Опубликована: Фев. 22, 2024

Язык: Английский

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Robust Nitro-Functionalized {Zn₃}-Organic Framework for Excellent Catalytic Performance on Cycloaddition Reaction of CO₂ with Epoxides and Knoevenagel Condensation

Crystal Growth & Design, Год журнала: 2024, Номер 24(8), С. 3473 - 3482

Опубликована: Апрель 8, 2024

Adjusting the Lewis acid–base sites in MOF-based catalysts to meet demand for catalytic CO2 chemical fixation is a huge challenge. Herein, highly robust rectilinear {Zn3}-based metal–organic framework of {[Zn3(TNTNB)2(4,4′-bip)(H2O)2]·5DMF·9H2O}n (NUC-80) was generalized from solvothermal condition (H3TNTNB = 1,3,5-tri(3-nitro-4-carboxyphenyl)-2,4,6-trinitrobenzene, 4,4′-bip 4,4′-bipyridine). Activated NUC-80a not only owns large void volume (58%) and two kinds solvent-accessible channels: rhombic-like (ca. 14.24 × 14.57 Å) along axis rectangular-like 11.72 14.48 b axis, but also functionalized by rich metal plentiful nitro groups on its inner surface. Performed experiments confirmed that could efficiently catalyze cycloaddition reaction with epoxides Knoevenagel condensations aldehydes malononitrile under mild conditions high turnover frequency (TOF). Hence, this work provides nitro-functionalized cluster-based nanoporous wide range potential applications such as catalysis, gas adsorption, separation.

Язык: Английский

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Structure regulation and catalytic performance of amine-functionalized zeolitic imidazolate frameworks for CO2 cycloaddition

Separation and Purification Technology, Год журнала: 2024, Номер 348, С. 127465 - 127465

Опубликована: Апрель 16, 2024

Язык: Английский

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NH2-Functionalized InIIIDyIII−Organic Frameworks for Efficient Catalytic Performance on Chemical Fixation of CO2 and Knoevenagel Condensation

Journal of Molecular Structure, Год журнала: 2025, Номер unknown, С. 141361 - 141361

Опубликована: Янв. 1, 2025

Язык: Английский

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Palladium immobilized on guanidine functionalized magnetic nanoparticles: a highly effective and recoverable catalyst for ultrasound aided Suzuki–Miyaura cross-coupling reactions

New Journal of Chemistry, Год журнала: 2023, Номер 47(40), С. 18856 - 18864

Опубликована: Янв. 1, 2023

The Fe 3 O 4 @SiO 2 -TCT-Gua-Pd catalyst anchored with guanidine moiety on nanoparticles was synthesised for Suzuki–Miyaura cross coupling reaction.

Язык: Английский

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Enhanced catalysis of CO2 cycloaddition at ambient pressure through rational design of interpenetrating ZnII/LnIII heterometallic coordination polymers

Journal of CO2 Utilization, Год журнала: 2024, Номер 80, С. 102686 - 102686

Опубликована: Янв. 24, 2024

The major obstacle in using CO2 the cycloaddition reactions with epoxides can be subdued through use of high performance catalysts particularly those efficient at or near ambient temperature and pressure. Performances heterogeneous are, however, subpar compared to homogeneous counterparts although being preferable from practical viewpoint. Heterometallic 3d-4f coordination polymers have offered best opportunity date their possible performances is not yet achieved. Through rational 2,2′-bipyridine-4,4′-dicarboxylic acid (H2bipydc), new series interpenetrating polymers, i.e. [ZnIILnIII(bipydc)2(HCOO)(H2O)3]∙2H2O where LnIII = PrIII (I), NdIII (II), SmIII (III) EuIII (IV), were synthesized characterized. Their single crystal structures elucidated, potential functioning sites identified. catalyzing allyl glycidyl ether evaluated. aid tetrabutylammonium bromide was notably necessary. unparallel disclosed. percentage yields over 80 %, conversion 85–90 turn-over number 2088 - 2260, frequencies 522 565 h−1 could achieved conducted 90 °C for 4 h Synergistic contribution various structural features postulated. Viability IV other monosubstituted also studied. Taking advantage structure, preferential influential interactions selected different metal prime motivation investigated computational calculations.

Язык: Английский

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Ultrahigh Stable Heterometallic InCo-Organic Framework for Efficiently Catalyzing Cycloaddition of CO2 with Epoxides and Knoevenagel condensation

Journal of Molecular Structure, Год журнала: 2024, Номер 1318, С. 139223 - 139223

Опубликована: Июль 6, 2024

Язык: Английский

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