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Herein, a new magnetic metal–organic frameworks based on Fe3O4 (NMMOFs) with porous and high surface area materials were synthesized. Then, NMMOFs were characterized by FT-IR, XRD, SEM, elemental mapping, energy dispersive X-ray (EDS), TG, DTG, VSM, and N2 adsorption–desorption isotherms (BET). Fe3O4@Co(BDC)-NH2 as a magnetic porous catalyst was ap...
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... These compounds find extensive applications in pharmacology, agrochemistry, organic synthesis, and industry. Despite the wide range of oxidizing agents available for this process, from inorganic salts, solid supports, microwaves, ultrasound, enzymes, UV-Vis, organo-inorganic molecular systems to Cytochrome P-450 [9][10][11][12][13][14][15][16][17], the oxidative aromatization of dihydropyridines presents real issues. These include the steric constrain and reactivity of functional groups in the molecule, sensitivity to various reagents and reaction conditions, and the formation of secondary products. ...
... Porous material consists of organic compounds and metal as ligand and nuclei that have a large surface area, high flexibility, and pore size planning are called metal-organic frameworks (MOFs). [28][29][30] This material was applied in separation, storage, magnetic resonance imaging (MRI), adsorption, catalyst, drug delivery, and power-saving. [31][32][33] Among them, the post-modification of metal-organic frameworks can be modified with metal, acid, and basic groups for the preparation of biological molecules, which make motivational enzymes attractive for catalytic processes. ...
... According to the XRD spectra, the structure of MIL-53(Al)-NH 2 matches well with previously reported studies. 20, 39 The peaks corresponding to the regions of 2θ = 8.84, 10 Table S1. ...
In the current study, we synthesized a new nanomagnetic metal-organic framework Fe3O4@MIL-53(Al)-N(CH2PO3)2 and characterized it using various techniques. This nanomagnetic metal-organic framework was used for the synthesis of a wide range of nicotinonitrile derivatives as suitable drug candidates by a four-component reaction of 3-oxo-3-phenylpropanenitrile or 3-(4-chlorophenyl)-3-oxopropanenitrile, ammonium acetate (NH4OAc), acetophenone derivatives, and various aldehydes including those bearing electron-donating, electron-withdrawing, and halogen groups, which afforded desired products (27 samples) via a cooperative vinylogous anomeric-based oxidation (CVABO) mechanism under solvent-free conditions in excellent yields (68-90%) and short reaction times (40-60 min). Increasing the surface-to-volume ratio, easy separation of the catalyst using an external magnet, and high chemical and temperature stability are the advantages of the described nanomagnetic metal-organic frameworks.
... It is worth noting that the coordination bond between metal ions and organic ligands ensures the degradability of MOFs, avoiding toxic side effects caused by the accumulation of drug carriers. Meanwhile, due to the presence of metal ions, photosensitivity and/or magnetic targeting can be utilized to achieve the goal of targeted diagnosis and synergistic therapy [42,43]. For example, zeolite imidazole framework (ZIF) materials, formed by imidazole or its derivatives as organic ligands linked with Zn 2+ , can rapidly decompose in acidic solutions. ...
For the excellent drug delivery systems, advanced functional materials are indispensable. In recent years, mesoporous materials have shown a promising prospect and attracted much attention in the field of drug delivery. The research of mesoporous materials as drug carriers becomes to be a hotspots. As a drug vehicle, it is favored by scientists due to the advantages in increasing drug dissolution and bioavailability, improving drug stability, sustained and controlled drug release, reducing drug side effects, good biocompatibility, targeting and so on. The anticipated in vivo performance for the mesoporous materials based drug delivery systems can be improved through optimizing the synthesis conditions or modifying the materials. In the paper, mesoporous silica nanoparticles (MSNs), mesoporous carbon nanoparticles (MCNs), organic frameworks (OFs), mesoporous hydroxyapatite (mHAp) were selected as the representative mesoporous materials. The structural characteristics, preparation methods, application in the field of drug delivery of above materials were reviewed, and the future research was prospected.
... The sonicated mixture was separated by an external magnet and washed with DMF. To that magnetic mixture DMF solution of H 2 BDC-NH 2 was added and sonicated for 45 min to obtain Fe 3 O 4 @Co(BDC)-NH 2 MMOF composites (Sepehrmansourie et al. 2021). ...
Developing a novel, simple, and cost-effective analytical technique with high enrichment capacity and selectivity is crucial for environmental monitoring and remediation. Metal–organic frameworks (MOFs) are porous coordination polymers that are self-assembly synthesized from organic linkers and inorganic metal ions/metal clusters. Magnetic metal–organic framework (MMOF) composites are promising candidate among the new-generation sorbent materials available for magnetic solid-phase extraction (MSPE) of environmental contaminants due to their superparamagnetism properties, high crystallinity, permanent porosity, ultrahigh specific surface area, adaptable pore shape/sizes, tunable functionality, designable framework topology, rapid and ultrahigh adsorption capacity, and reusability. In this review, we focus on recent scientific progress in the removal of heavy metal ions present in contaminated aquatic system by using MMOF composites. Different types of MMOFs, their synthetic approaches, and various properties that are harnessed for removal of heavy metal ions from contaminated water are discussed briefly. Adsorption mechanisms involved, adsorption capacity, and regeneration of the MMOF sorbents as well as recovery of heavy metal ions adsorbed that are reported in the last ten years have been discussed in this review. Moreover, particular prospects, challenges, and opportunities in future development of MMOFs towards their greener synthetic approaches for their practical industrial applications have critically been considered in this review.
Graphical abstract
... 51,52 Additionally, synthesis of new pyridines via vinylogous anomeric based oxidation concept due to their biological activities has more attention. [53][54][55][56][57][58] Scheme 2. The structure of compounds with medicinal, biological and agricultural properties includes pyridine and indole nuclei. ...
... Therefore, the presented mechanism is reasonable for the last step of oxidation and aromatization of 1,4-dihydropyridines (Scheme 7). [53][54][55][56][57][58] In another section, to determine the efficiency of ammonium acetate as a dual role of reagentcatalyst, we have tested the model reaction using previously reported catalysts or reagent such as organic, magnetic, solid acid, and basic materials. The results of the reactions showed that ammonium acetate as a dual role of reagent-catalyst is the best condition for the synthesis of bis(3indolyl) pyridine derivatives (short reaction time and high yield; Table 3). ...
Herein, we introduced a new method for the synthesis of bis(3-indolyl)pyridines. Accordingly, ammonium acetate was introduced as a dual reagent-catalyst role, for preparation of bis(3-indolyl)pyridines without using any toxic solvents and co-catalysts. Also, the cooperative vinylogous anomeric based oxidation (CVABO) theory plays a synergistic effect for the aromatization of final product. The final structure of products has been verified using FT-IR and ¹H-NMR, ¹³C-NMR techniques.
... A significant potential advantage of nanostructures containing Ti-MOF, Zr-MOF, and g-C 3 N 4 is the possibility of using sunlight to separate photogenerated electron-hole pairs [41][42][43][44], which is convenient, economical, and efficient. Concerning the above issues and our previous reports on developing engineered nanomaterials [45][46][47][48][49][50][51][52][53], we have explored the epitaxial growth of UiO-66 on the NH 2 -MIL-125 surface via the solvothermal method for developing MOF-on-MOF architectures. Subsequently, we successfully decorate g-C 3 N 4 nanosheets in UiO-66/NH 2 -MIL-125 surface to design a new type of double Z-scheme heterojunction photocatalyst for degradation of OFL under visible light. ...
Well-organized UiO-66-on-MIL-125 growth onto g-C3N4 nanosheets was developed for ofloxacin (OFL) antibiotics degradation under visible light irradiation (λ > 420 nm). First, NH2-MIL-125 as a host MOF was prepared by a solvothermal method, and then UiO-66 crystals were grown onto the NH2-MIL-125 surface with the same method. Subsequently, g-C3N4 nanosheets were decorated onto Zr-MOF-on-Ti-MOF surface to obtain a new type of the double Z-scheme UiO-66/NH2-MIL-125/g-C3N4 heterojunction. Under visible light irradiation, this double Z-scheme heterojunction acts as a highly efficient photocatalyst for the degradation of OFL with a rate constant of 0.07 min⁻¹, which is about 1.79 times higher than that of pristine UiO-66-on-MIL-125. Also, the findings obtained from radical trapping and EPR indicated that •OH and •O2⁻ play an essential role in OFL photodegradation. The current study provides not only new horizons to architecture MOF on other MOFs but also develops Z-scheme heterojunction materials for removing emerging pollutants from wastewater.
... 42 Lately, different shapes of MOF-based core−shell structures including MOF@MOF microporous core−shell architectures, polystyrene@MOF photonic films, 43 MOF@SiO 2 nanocomposites, 44 and some others have been extensively studied. 45 In view of the attention garnered for the development of magnetic particles with controlled morphologies, 46 magnetic MOFs with core−shell structures have been developed. 47 The design of such structures not only highlights the superiorities of MOFs but also benefits from the unique features of magnetic nanoparticles (NPs). ...
Due to the increasing environmental pollution caused by human activities, environmental remediation has become an important subject for humans and environmental safety. The quest for beneficial pathways to remove organic and inorganic contaminants has been the theme of considerable investigations in the past decade. The easy and quick separation made magnetic solid-phase extraction (MSPE) a popular method for the removal of different pollutants from the environment. Metal−organic frameworks (MOFs) are a class of porous materials best known for their ultrahigh porosity. Moreover, these materials can be easily modified with useful ligands and form various composites with varying characteristics, thus rendering them an ideal candidate as adsorbing agents for MSPE. Herein, research on MSPE, encompassing MOFs as sorbents and Fe3O4 as a magnetic component, is surveyed for environmental applications. Initially, assorted pollutants and their threats to human and environmental safety are introduced with a brief introduction to MOFs and MSPE. Subsequently, the deployment of magnetic MOFs (MMOFs) as sorbents for the removal of various organic and inorganic pollutants from the environment is deliberated, encompassing the outlooks and perspectives of this field.
... Also, being focused on enamines is one of the most fascinating developments in preparation of widely applied organic materials, such as natural products as well as pyridine scaffolds. [14][15][16][17][18] The pyridine ring systems have biological activity like as inhibiting HIV protease, antidepressant, anti-inflammatory, inhibiting acetylcholinesterase, treating hypotension, or hypertension. 19,20 Among them, diphenyl nicotinonitriles are known to have multipurpose biological activities, such as anti-inflammatory activity, anti-Alzheimer's, and anti-proliferative properties. ...
... Then, model reaction was tested in different amount of catalyst or temperature, which is not improved of result (Table 2, entries 2-10). Also, this reaction was also checked out using several solvents, such as n-Hexane, EtOH, MeOH, DMF, CH 2 Cl 2 , CHCl 3 , CH 3 CN, EtOAc, and H 2 O (10 mL) and solvent-free condition in the presence of 20 mg of Fe 3 O 4 @GTMPA, which the obtained results of the reaction did not improve ( Table 2, entries [11][12][13][14][15][16][17][18][19]. ...
Herein, we synthesized biological magnetic glycoluril tetrakis(methylene phosphorous acid) as a new heterogeneous nano-catalyst. The magnetic nano-catalyst Fe3O4@GTMPA was used for the synthesis of diphenyl nicotinonitrile derivatives by multi-component reaction of wide spread aldehydes, acetophenones, ammonium acetate, and 3-(1H-indol-3-yl)-3-oxopropanenitrile in the solvent-free conditions at 110 °C. The final step of reaction mechanism was preceded via a cooperative vinylogous anomeric-based oxidation (CVABO) as green and convenient approach.
... MOFs have been applied in many areas to date due to their high specific surface area (usually 1000-10000 m 2 g -1 ), well-organized porous channels, and easily tunable composition and structure, especially in catalysis [31,32]. IRMOF-3, Co(BDC)-NH 2 , and ED/Cr-MIL-101 were successfully prepared to stabilize metal ions (Cu, Fe, Pd) for catalyzing drug synthesis and driving chemical reactions [33][34][35][36]. MOFs also have the potential for organic pollutants degradation. ...
The antibiotic florfenicol (FF) discharged into the aquatic environment may cause serious water pollution. Therefore, an effective way to eliminate FF antibiotics from the water bodies should be proposed. Herein, MIL-53(Al)-supported nano zero-valent iron ([email protected](Al)) was synthesized and applied to activate hydrogen peroxide (H2O2) to spark the Fenton reaction for FF antibiotics removal. The characterization results demonstrated the successful loading and good dispersion of NZVI onto MIL-53(Al). 100% FF antibiotics degradation could be achieved under the optimal reaction conditions, including an initial FF antibiotics concentration of 20 mg L⁻¹, initial solution pH of 3.0, [email protected](Al) dose of 25 mg L⁻¹, and H2O2 concentration of 0.2 mM. And after four cycles, the FF antibiotic degradation efficiency was still 81.18%. The lowest tolerance for HCO3⁻ was observed while the degradation activity was maintained at the presence of Cl⁻ and HA. EPR measurement and free radical quenching experiment showed that ·OH was the main reactive specie in the [email protected](Al)/H2O2 system. FF antibiotics degradation involved hydroxylation reactions (electrophilic substitution), dehalogenation, hydrolysis, and cleavage based on the UPLC-MS/MS analysis and DFT calculation. Noteworthy, 0.247 mg L⁻¹ of F⁻ and 1.2 mg L⁻¹ of Cl⁻ were detected in the solution after the reaction due to the breakage of the stable C–Cl bond and C–F bond. Finally, this work revealed that the [email protected](Al), with high stability and recyclability, could be a potential heterogeneous catalyst for treating antibiotic wastewater.
