Publications by authors named "Hassan Sepehrmansourie"

The strategy of designing heterogeneous porous catalysts by a post-modification method is a smart strategy to increase the catalytic power of desired catalysts. Accordingly, in this report, metal-organic frameworks based on titanium with acetic acid pending were designed and synthesized via post-modification method. The structure of the target catalyst has been investigated using different techniques such as FT-IR, XRD, SEM, EDX, Mapping, and N adsorption/desorption (BET/the BJH) the correctness of its formation has been proven.

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Herein, we designed and synthesized a new H-bond magnetic catalyst with 2-tosyl--(3-(triethoxysilyl)propyl)hydrazine-1-carboxamide as a sensitive H-bond donor/acceptor. We created an organic structure with a urea moiety on the magnetic nanoparticles, which can function as a hydrogen bond catalyst. Hydrogen bond catalysts serve as multi-donor/-acceptor sites.

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The use of click chemistry as a smart and suitable method for the development of new heterogeneous catalysts is based on metal-organic frameworks as well as the production of organic compounds. The development of the click chemistry method can provide a new strategy to achieve superior properties of MOFs. Here, the two metals Co and Fe are used to create a bimetallic-organic framework.

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The main goal of this article is to discuss the expansion of click chemistry. A new catalyst composed of CuO nanoparticles embedded in Zn-MOF with the ligand 2,4,6-tris(4-carboxyphenoxy)-1,3,5-triazine (HL) is presented. The incorporation of CuO nanoparticles into the Zn-MOF structure led to desirable morphology and catalytic properties.

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The anomeric effect highlights the significant influence of the functional group and reaction conditions on oxidation-reduction. This article successfully investigates the anomeric effect in the synthesis of picolinate and picolinic acid derivatives through a multi-component reaction involving 2-oxopropanoic acid or ethyl 2-oxopropanoate, ammonium acetate, malononitrile, and various aldehydes. To facilitate this process, we employed UiO-66(Zr)-N(CHPOH) as a novel nanoporous heterogeneous catalyst.

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Combining two different metals for the synthesis of a metal-organic framework (MOF) is a smart strategy for the architecture of new porous materials. Herein, a bimetal-organic framework (bimetal-MOFs) based on Fe and Co metals was synthesized. Then, phosphorous acid tags were decorated on bimetal-MOFs via a postmodification method as a new porous acidic functionalized catalyst.

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In this research article, Zr-MOFs based copper complex as a novel heterogeneous and porous catalyst was designed and prepared. The structure of catalyst has verified by various techniques such as FT-IR, XRD, SEM, N adsorption-desorption isotherms (BET), EDS, SEM-elemental mapping, TG and DTG analysis. UiO-66-NH/TCT/2-amino-Py@Cu(OAc) was used as an efficient catalyst in the synthesis of pyrazolo[3,4-b]pyridine-5-carbonitrile derivatives.

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In the current study, we synthesized a new nanomagnetic metal-organic framework FeO@MIL-53(Al)-N(CHPO) 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 (NHOAc), 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.

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Herein, we report the design and synthesis of Co-MOF-71/imidazole/SOH as a novel porous catalyst with sulfonic acid tags. The structure and morphology of the catalyst were investigated using various techniques such as Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction, scanning electron microscopy (SEM), SEM elemental mapping, energy-dispersive X-ray spectroscopy, Barret-Joyner-Halenda, and N adsorption-desorption isotherms. Co-MOF-71/imidazole/SOH was studied in the preparation of novel pyrazolo[3,4-]pyridines under mild and green conditions via a cooperative vinylogous anomeric-based oxidation.

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In this study, a novel functionalized metal-organic frameworks MIL-125(Ti)-N(CHPOH) was designed and synthesized post-modification methodology. Then, MIL-125(Ti)-N(CHPOH) as a mesoporous catalyst was applied for the synthesis of a wide range of novel tetrahydropyrido[2,3-]pyrimidines as bioactive candidate compounds by one-pot condensation reaction of 3-(1-methyl-1-pyrrol-2-yl)-3-oxopropanenitrile, 6-amino-1,3-dimethylpyrimidine-2,4(1,3)-dione and aromatic aldehydes at 100 °C under solvent-free condition. Interestingly, the preparation of tetrahydropyrido[2,3-]pyrimidine was achieved vinylogous anomeric based oxidation mechanism with a high yield and short reaction time.

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Herein, we have presented a new insight for the synthesis of a hybrid heterogeneous catalyst. For this purpose, phosphonic acid tagged carbon quantum dots of CQDs-N(CHPOH) encapsulated and assembled in channels of SBA-15 using a post-modification strategy. The mesoporous catalyst of functionalized carbon quantum dots (CQDs) was characterized by several techniques.

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In this study, a novel nano-magnetic metal-organic frameworks based on FeO namely FeO@MIL-101(Cr)-N(CHPO) was synthesized and fully characterized. The prepared sample was used as catalyst in the synthesis of pyrazolo [3,4-b] pyridines as convenient medicine by condensation reaction of aldehydes, 5-(1H-Indol-3-yl)- 2H-pyrazol-3-ylamine and 3-(cyanoacetyl)indole via a CVABO. The products were obtained with high yields at 100 °C and under solvent-free conditions.

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Article Synopsis
  • A new nano-structured catalyst, CQDs-N(CHPOH), was created by combining carbon quantum dots with phosphorus acid through a refluxing process in ethanol.
  • The catalyst was extensively characterized using techniques like FT-IR, TEM, SEM, EDX, TG analysis, fluorescence, and XRD to analyze its structure and morphology.
  • It was applied successfully for synthesizing a specific compound (2-amino-6-(2-methyl-1-indol-3-yl)-4-phenyl-4-pyran-3,5-dicarbonitriles) via one-pot reactions involving aromatic aldehydes, indole derivatives, and malononitrile under reflux and ultrasound conditions.
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Electrochemical reduction of different aryldiazonium salts in aqueous solution was studied in this work and it is shown that the aryldiazonium salts are converted to the corresponding aryl radical and aryl anion. The results of this research indicate that the reduction of aryldiazonium salts takes place in two single-electron steps. Our data show that when the substituted group on the phenyl ring is H, Cl, OH, NO, OCH or SO , the corresponding diazonium salt shows poor adsorption characteristics, but when the substituted group is methyl, the corresponding diazonium salt shows strong adsorption characteristics.

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In this paper, the MIL-53(Al)-NH metal-organic frameworks (MOFs) was prepared based on the anodic electrosynthesis under green conditions. The anodic electrosynthesis as an environmentally friendly procedure was performed in the aqueous solution, room temperature, atmospheric pressure, and in the short reaction time (30 min). Also, the employed procedure was accomplished without the need for the ex-situ salt and base/probase additives as cation source and ligand activating agent at the constant current mode (10.

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Article Synopsis
  • A new magnetic metal-organic framework (NMMOF) based on FeO was developed, showcasing its porous structure and high surface area.
  • The synthesized NMMOFs underwent comprehensive characterization using multiple techniques, including FT-IR, XRD, and SEM, among others.
  • FeO@Co(BDC)-NH was effectively utilized as a catalyst for creating novel drug candidates under ultrasonic conditions, offering benefits like efficient reactions, easy cleanup, and reusability.
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In this paper, poly(vinyl imidazole) sulfonic acid nitrate [PVI-SOH]NO was synthesized and fully characterized. Then, [PVI-SOH]NO was applied for the preparation of energetic materials such as 1,1-diamino-2,2-dinitroethene (FOX-7), pentaerythritol tetranitrate (PETN), 1,3,5-trinitro-1,3,5-triazinane (RDX) and trinitrotoluene (TNT). The major advantages of the presented methodology are mild, facile workup, high yields and short reaction times.

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In the current paper, we successfully developed and used metal-organic frameworks (MOFs) based on MIL-101(Cr)-NH with phosphorus acid functional groups MIL-101(Cr)-N(CHPOH). The synthesized metal-organic frameworks (MOFs) as a multi-functional heterogeneous and nanoporous catalyst were used for the synthesis of -amino-2-pyridone and pyrano [2,3-]pyrazole derivatives via reaction of ethyl cyanoacetate or ethyl acetoacetate, hydrazine hydrate, malononitrile, and various aldehydes. The final step of the reaction mechanism was preceded by a cooperative vinylogous anomeric-based oxidation.

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Herein, two novel mesoporous cross-linked poly(vinyl imidazole)s with sulfonic acid tags, [PVI-SOH]Cl () and [PVI-SOH]FeCl (), were prepared and characterized by a variety of techniques such as Fourier transform infrared spectroscopy, scanning electron microscopy, elemental mapping, energy dispersive X-ray analysis, transmission electron microscopy, thermal gravimetry, derivative thermal gravimetry, and N adsorption-desorption isotherms (Brunauer-Emmett-Teller). In addition, magnetic properties of poly(vinyl imidazole) sulfonic acid iron(IV) chloride [PVI-SOH]FeCl () as an ionically tagged magnetic polymer were investigated using a vibrating sample magnetometer. The presented polymers, [PVI-SOH]Cl () and [PVI-SOH]FeCl (), were successfully applied as reusable and efficient catalysts for the preparation of N-heterocycle spiropyrans.

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