Jamal Rahimi - Academia.edu (original) (raw)
Papers by Jamal Rahimi
Materials Today Chemistry
Inorganic Chemistry Communications
This research is an interdisciplinary study aimed at helping the environment and producing clean ... more This research is an interdisciplinary study aimed at helping the environment and producing clean energy. Therefore, one of the goals of this research towards the field of nanotechnology is the application of nanotechnology in the preparation of solar cells and the provision of optimal and efficient cells. Perovskite solar cells are of particular importance because of the high efficiencies that they have achieved in recent years. The use of quantum dots has also played an important role in the efficiency of these cells and their efficiency. The TiO2@ZnO nanocomposite was selected and synthesized for this study. The application of this nanocomposite with different ratios of TiO2 and ZnO quantum dots was investigated and their efficiency was determined. Although the efficiency of the fabricated cell was reported to be about 5% in a solar cell made of TiO2@ZnO composite, the efficiency can be increased by optimizing conditions such as the optimal location for these cells or by compositi...
Current Organic Synthesis, 2020
Introduction: An instrumental strategy for α-iminonitrile derivatives preparation by Fe3O4@cellul... more Introduction: An instrumental strategy for α-iminonitrile derivatives preparation by Fe3O4@cellulose-OSO3H (MCSA) as an eco-friendly nanocatalyst and oxidative agent in aerobic condition, is presented. Materials and Methods: Through this method, a one-pot three-component condensation reaction of various aldehydes, primary amines and trimethylsilylcyanide (TMSCN) were applied to synthesize the desired products. It was performed in absolute ethanol and under a mild condition by using the presented nanocatalyst. High reaction yields were obtained through using the presented magnetic agent, as well. Moreover, the threecomponent reactions were executed using accessible and economical precursors. The convenient separation and recyclability of the used nanocatalyst were also precisely investigated. Results and Discussion: In this research, we identified novel α-iminonitrile derivatives using 1H NMR, 13C NMR, CHN, and FT-IR analyses, as well. In order to determine the well-known derivatives...
Frontiers of Chemical Science and Engineering, 2020
This study focuses on the synthesis and characterization of a novel magnetic nanocomposite 2,4,6-... more This study focuses on the synthesis and characterization of a novel magnetic nanocomposite 2,4,6-trihydrazino-1,3,5-triazine (THDT)-functionalized with silica-coated iron oxide magnetic nanoparticles (MNPs). This nanocomposite has porous morphology decorated with the spherical MNPs. Through co-precipitation of iron salts, MNPs were obtained. The prepared THDT was placed on the chlorine surface-modified MNPs. The present environment-friendly nanocatalyst intensely accelerated the synthesis of highly functionalized tetrahydrobenzo[ b ]pyran derivatives as well as reduced the reaction times and increased yields of the products.
New Journal of Chemistry, 2020
A heterogeneous magnetic catalytic system is fabricated and suitably applied for the fast and dir... more A heterogeneous magnetic catalytic system is fabricated and suitably applied for the fast and direct conversion of nitrobenzene (NB) derivatives to their aniline forms.
Materials Chemistry and Physics, 2020
Facile design and synthesis of pentavanadium on perlite via an efficient method. � The perlite/V ... more Facile design and synthesis of pentavanadium on perlite via an efficient method. � The perlite/V 2 O 5 nanocomposite was obtained in a spherical-shaped morphology. � The nanocatalyst was applied in the oxidation of benzylic alcohols successfully. � The nanocomposite has an excellent stability and recoverability in the reactions.
Materials Today Chemistry, 2020
In recent years, there is a high demand on utilizing heterogeneous nanocatalysts in organic synth... more In recent years, there is a high demand on utilizing heterogeneous nanocatalysts in organic synthetic routes because of their green approach, facile purification of the products, and reusability of the catalyst. Herein, we introduced trihydrazinotriazine (THDT)-coated Fe 3 O 4 @SiO 2 as a novel amino-functionalized magnetic nanocompostie. We fully characterized the nanocatalyst and proved the morphology and magnetic property of the nanoparticles by using essential analyses. The basic attribute of the amino-rich porous surface of the nanocomposite provides a desirable environment for enhancing various reaction conditions. To examine the applicability of the nanocatalyst in organic reactions, we synthesized several benzoxanthenes using Fe 3 O 4 @SiO 2-THDT nanocatalysts. The nanocomposite successfully improved the reaction conditions and provided the benzoxanthenes in an environmentally friendly procedure, which afforded product in excellent yields (80e96%) and reduced time. The nanomagnetic catalyst was easily recovered after each trial by using an external magnet. After six successive runs, the loss of catalytic activity of the nanocomposite was negligible. Finally, we propounded a plausible mechanism for the preparation of the benzoxanthenes derivatives using the THDT-functionalized core-shell magnetic nanocatalyst.
Frontiers in Chemistry, 2020
Fe 3 O 4 @PVA-Cu nanocomposite was introduced as an affordable catalyst for selective oxidation o... more Fe 3 O 4 @PVA-Cu nanocomposite was introduced as an affordable catalyst for selective oxidation of alcohols into various aldehydes and ketones. The synthesized nanocomposite was characterized by applying essential analyses. The peaks that are appeared in FT-IR spectroscopy confirmed the production of the Fe 3 O 4 @PVA-Cu nanocomposite. In addition, EDX analysis proved the presence of oxygen, carbon, iron, and copper elements in the catalyst. Further, TGA analysis showed high thermal stability of the nanocomposite. VSM technique was applied to examine the magnetic property of the nanocomposite. The results demonstrated a high magnetic property in the catalyst, which enables easy separation of it from the reaction solution. TEM and SEM imaging showed the nanoscale size of the particles (∼20 nm) in the catalyst. Additionally, XRD data was compatible with that of Fe 3 O 4 nanoparticles. The application of the nanocomposite has been studied in the selective oxidation of alcohols in the presence of acetonitrile as solvent, and hydrogen peroxide as a supplementary oxidizing agent. This technique is remarkably facile and inexpensive. Further, the products showed high yields. In addition, the calculated TON and TOF values indicated the phenomenal efficiency of the nanocomposite in preparation of targeted products.
Solid State Sciences, 2020
Abstract Herein, Fe3O4@tannic acid-Cu was prepared by using a low-cost, simple, and green process... more Abstract Herein, Fe3O4@tannic acid-Cu was prepared by using a low-cost, simple, and green process as follows. Fourier-transform infrared spectra, X-ray diffraction, EDX, field-emission scanning electron microscopy, thermal analysis, TEM analysis, and vibrating sample magnetometer measurements have been used to characterize the bionanocomposite. Some important reasons for the novelty of the bionanocomposite are that due to a large number of hydroxyl and phenolic hydroxyl groups in the tannic acid cooper cooperates well and also increases catalytic activity of bionanocomposite for selective oxidation of alcohols. The most important aspect of the bionanocomposite is that synthesized from biomaterial that makes the selective oxidation of alcohols to aldehyde and ketones green and environmentally friendly. Besides, due to the unique morphology of the bionanocomposite, it operates as an impressive bionanocatalyst. Afterward, the synthesized bionanocomposite was operated as a highly effective heterogeneous catalyst for selective oxidation of alcohols. High-to-excellent yields, short reaction time, easy separation of the nanocatalyst, easy work-up, and non-toxicity are several advantages of this protocol. Likewise, the calculated TONs and TOFs values proved the noteworthy performance of the bionanocomposite in the preparation of aldehyde and ketones. Because of the morphology of bionanocomposite, Fe3O4@tannic acid-Cu has a large surface active area that caters to high catalytic activity.
Materials Research Express, 2020
Method development for surface functionalization of vinyl-coated iron oxide nanoparticles via [4 ... more Method development for surface functionalization of vinyl-coated iron oxide nanoparticles via [4 + 2] one-pot cycloaddition is presented in this work. Small molecules are loaded onto the surface of silica-coated magnetic nanoparticles (Fe3O4/SiO2 NPs) by various methods. The main factors such as surface modification ratio, core/shell structure maintenance, spherical morphology preservation and particle size uniformity were precisely investigated by various analyses. In this regard, reflux, microwave and ultrasound wave irradiation have been well compared as three different effective methods for carrying out the cycloaddition (CA) reactions onto the surface of magnetic nanoparticles. Overall, it was concluded that the safer and faster method for this purpose is implemented by the ultrasound wave irradiation.
Catalysis Communications, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Ultrasonics Sonochemistry, 2019
Synergistic catalytic effect between ultrasound waves and pyrimidine-2,4-diamine-functionalized m... more Synergistic catalytic effect between ultrasound waves and pyrimidine-2,4-diamine-functionalized magnetic nanoparticles: Applied for synthesis of 1,4-dihydropyridine pharmaceutical derivatives
ACS Omega, 2019
Proportional to considerable progress in protein− drug conjugations, attention to the efficient p... more Proportional to considerable progress in protein− drug conjugations, attention to the efficient peptide coupling reagents is being increased. Hence, in this study, a versatile heterogeneous nanoscale reagent is presented for chemical, biological, and medical purposes. A combination of silver and silica-coated iron oxide nanoparticles (Ag/Fe 3 O 4) has been well functionalized with isothiazolone rings via a silver-modified Heck mechanism. An appropriate condition is provided for peptide bond formation through the surface interplay between silanol groups and the loaded isothiazolone rings. A logical mechanism including a series of successive covalent bonds onto the surface of Ag/Fe 3 O 4 nanocomposites is suggested for this catalyzed peptide bond formation. Accurate comparisons have been made to obtain the optimum value of the nanocatalyst and suitable conditions. As an additional application, the biological activity of the desired product has also been investigated through antibacterial assay tests. The results showed that our desired product could also be used as an effective heterogeneous nanoscale antibacterial agent for different purposes. In this regard, all of the essential structural and practical analyses have been carried out and precisely interpreted.
![Research paper thumbnail of Multicomponent synthesis of pyrano[2,3-d]pyrimidine derivatives via a direct one-pot strategy executed by novel designed copperated Fe3O4@polyvinyl alcohol magnetic nanoparticles](https://attachments.academia-assets.com/98690703/thumbnails/1.jpg)
](Materials Today Chemistry, 2019
Recently, attention to magnetic nanoparticles has been increased because of their extreme active ... more Recently, attention to magnetic nanoparticles has been increased because of their extreme active surface area, composition, and magnetic separation capability. In this regard, a magnetic nanocatalyst system was designed and used for facilitating one-pot synthesis of pyrano[2,3-d]pyrimidine derivatives. This product takes advantages of copper(II) ions chelated with oxygen atoms of polyvinyl alcohol (PVA) strands, which were well composited with iron oxide magnetic nanoparticles during an in situ process. High reaction yields were obtained by using this efficient nanocatalyst in the short times and under mild conditions. High hydrophilicity, convenient separation, and acceptable recyclability have been investigated and introduced as the features of this nanocatalyst. Structural studies related to the nanoscale materials have also been carried out and well interpreted in this report.
![Research paper thumbnail of Facile synthesis of tetrazolo[1,5-a]pyrimidine with the aid of an effective gallic acid nanomagnetic catalyst](https://attachments.academia-assets.com/98690701/thumbnails/1.jpg)
](Polyhedron, 2019
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Facile synthesis of tetrazolo[1,5-a]pyrimidine with the aid of an effective gallic acid nanomagnetic catalyst
Nano-Structures & Nano-Objects, 2019
Abstract Polyvinyl alcohol is a suitable substrate for the catalysis of the organic reactions due... more Abstract Polyvinyl alcohol is a suitable substrate for the catalysis of the organic reactions due to the large amount of hydroxyl functional groups. In this research, a new approach for in-situ preparation of Fe3O4@PVA nanostructure as well as its sulfonation was investigated. Then, the functional groups of the prepared nanocatalyst was characterized by Fourier transform infrared (FT-IR) spectroscopy. The size and morphology of the nanoparticles were tested by using scanning electron microscopy (SEM) images. The presence of constructive elements in the nanocomposites was confirmed by energy dispersive X-ray (EDX) analysis. To better insight, the structure and magnetic properties of the prepared nanostructure was studied by X-ray diffraction (XRD) pattern and vibrating sample magnetometer (VSM) analysis. Thermal stability and weight loss for the nanostructure composition at each step of weight change were screened by thermogravimetric analysis (TGA). Finally, the nanocomposite structure prepared was confirmed by transmission electron microscope (TEM) image. Then, for the first time, Fe3O4@PVA sulfonic acid–based superparamagnetic nanocatalyst was studied for the synthesis of 2,4,5-triarylimidazoles derivatives via a one-pot three-component condensation reaction starting from between ammonium acetate, aldehyde derivatives and benzil or benzoin. Due to high magnetic property of the catalyst, it was easily recyclable by a magnet at least for ten runs without any significantly reducing of catalytic activity.
BMC Chemistry, 2019
For the first time, the design and preparation of magnetic polyvinyl alcohol (Fe 3 O 4 @PVA) nano... more For the first time, the design and preparation of magnetic polyvinyl alcohol (Fe 3 O 4 @PVA) nanocomposite film as a novel nanocatalyst was accomplished by in situ precipitation method. To enhance the catalysis activity, the surface modification of this nanocomposite was carried out by sulfonic acid. After the synthesis of this nanocomposite film, Fourier-transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray (EDX) analysis, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) images, X-ray diffraction (XRD) pattern, N 2 adsorption-desorption by Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM) were utilized to confirm the structure of the nanocomposite. The catalytic activity of Fe 3 O 4 @PVA was investigated by the synthesis of dihydropyrimidine derivatives from an aldehyde, ß-ketoester and urea or thiourea. This heterogeneous nanocatalyst can be easily separated by an external magnet and reused for several times without any significant loss of activity. Simple work-up, mild reaction conditions and easily recoverable catalyst are the advantageous of this nanocomposite film.
Materials Today Chemistry
Inorganic Chemistry Communications
This research is an interdisciplinary study aimed at helping the environment and producing clean ... more This research is an interdisciplinary study aimed at helping the environment and producing clean energy. Therefore, one of the goals of this research towards the field of nanotechnology is the application of nanotechnology in the preparation of solar cells and the provision of optimal and efficient cells. Perovskite solar cells are of particular importance because of the high efficiencies that they have achieved in recent years. The use of quantum dots has also played an important role in the efficiency of these cells and their efficiency. The TiO2@ZnO nanocomposite was selected and synthesized for this study. The application of this nanocomposite with different ratios of TiO2 and ZnO quantum dots was investigated and their efficiency was determined. Although the efficiency of the fabricated cell was reported to be about 5% in a solar cell made of TiO2@ZnO composite, the efficiency can be increased by optimizing conditions such as the optimal location for these cells or by compositi...
Current Organic Synthesis, 2020
Introduction: An instrumental strategy for α-iminonitrile derivatives preparation by Fe3O4@cellul... more Introduction: An instrumental strategy for α-iminonitrile derivatives preparation by Fe3O4@cellulose-OSO3H (MCSA) as an eco-friendly nanocatalyst and oxidative agent in aerobic condition, is presented. Materials and Methods: Through this method, a one-pot three-component condensation reaction of various aldehydes, primary amines and trimethylsilylcyanide (TMSCN) were applied to synthesize the desired products. It was performed in absolute ethanol and under a mild condition by using the presented nanocatalyst. High reaction yields were obtained through using the presented magnetic agent, as well. Moreover, the threecomponent reactions were executed using accessible and economical precursors. The convenient separation and recyclability of the used nanocatalyst were also precisely investigated. Results and Discussion: In this research, we identified novel α-iminonitrile derivatives using 1H NMR, 13C NMR, CHN, and FT-IR analyses, as well. In order to determine the well-known derivatives...
Frontiers of Chemical Science and Engineering, 2020
This study focuses on the synthesis and characterization of a novel magnetic nanocomposite 2,4,6-... more This study focuses on the synthesis and characterization of a novel magnetic nanocomposite 2,4,6-trihydrazino-1,3,5-triazine (THDT)-functionalized with silica-coated iron oxide magnetic nanoparticles (MNPs). This nanocomposite has porous morphology decorated with the spherical MNPs. Through co-precipitation of iron salts, MNPs were obtained. The prepared THDT was placed on the chlorine surface-modified MNPs. The present environment-friendly nanocatalyst intensely accelerated the synthesis of highly functionalized tetrahydrobenzo[ b ]pyran derivatives as well as reduced the reaction times and increased yields of the products.
New Journal of Chemistry, 2020
A heterogeneous magnetic catalytic system is fabricated and suitably applied for the fast and dir... more A heterogeneous magnetic catalytic system is fabricated and suitably applied for the fast and direct conversion of nitrobenzene (NB) derivatives to their aniline forms.
Materials Chemistry and Physics, 2020
Facile design and synthesis of pentavanadium on perlite via an efficient method. � The perlite/V ... more Facile design and synthesis of pentavanadium on perlite via an efficient method. � The perlite/V 2 O 5 nanocomposite was obtained in a spherical-shaped morphology. � The nanocatalyst was applied in the oxidation of benzylic alcohols successfully. � The nanocomposite has an excellent stability and recoverability in the reactions.
Materials Today Chemistry, 2020
In recent years, there is a high demand on utilizing heterogeneous nanocatalysts in organic synth... more In recent years, there is a high demand on utilizing heterogeneous nanocatalysts in organic synthetic routes because of their green approach, facile purification of the products, and reusability of the catalyst. Herein, we introduced trihydrazinotriazine (THDT)-coated Fe 3 O 4 @SiO 2 as a novel amino-functionalized magnetic nanocompostie. We fully characterized the nanocatalyst and proved the morphology and magnetic property of the nanoparticles by using essential analyses. The basic attribute of the amino-rich porous surface of the nanocomposite provides a desirable environment for enhancing various reaction conditions. To examine the applicability of the nanocatalyst in organic reactions, we synthesized several benzoxanthenes using Fe 3 O 4 @SiO 2-THDT nanocatalysts. The nanocomposite successfully improved the reaction conditions and provided the benzoxanthenes in an environmentally friendly procedure, which afforded product in excellent yields (80e96%) and reduced time. The nanomagnetic catalyst was easily recovered after each trial by using an external magnet. After six successive runs, the loss of catalytic activity of the nanocomposite was negligible. Finally, we propounded a plausible mechanism for the preparation of the benzoxanthenes derivatives using the THDT-functionalized core-shell magnetic nanocatalyst.
Frontiers in Chemistry, 2020
Fe 3 O 4 @PVA-Cu nanocomposite was introduced as an affordable catalyst for selective oxidation o... more Fe 3 O 4 @PVA-Cu nanocomposite was introduced as an affordable catalyst for selective oxidation of alcohols into various aldehydes and ketones. The synthesized nanocomposite was characterized by applying essential analyses. The peaks that are appeared in FT-IR spectroscopy confirmed the production of the Fe 3 O 4 @PVA-Cu nanocomposite. In addition, EDX analysis proved the presence of oxygen, carbon, iron, and copper elements in the catalyst. Further, TGA analysis showed high thermal stability of the nanocomposite. VSM technique was applied to examine the magnetic property of the nanocomposite. The results demonstrated a high magnetic property in the catalyst, which enables easy separation of it from the reaction solution. TEM and SEM imaging showed the nanoscale size of the particles (∼20 nm) in the catalyst. Additionally, XRD data was compatible with that of Fe 3 O 4 nanoparticles. The application of the nanocomposite has been studied in the selective oxidation of alcohols in the presence of acetonitrile as solvent, and hydrogen peroxide as a supplementary oxidizing agent. This technique is remarkably facile and inexpensive. Further, the products showed high yields. In addition, the calculated TON and TOF values indicated the phenomenal efficiency of the nanocomposite in preparation of targeted products.
Solid State Sciences, 2020
Abstract Herein, Fe3O4@tannic acid-Cu was prepared by using a low-cost, simple, and green process... more Abstract Herein, Fe3O4@tannic acid-Cu was prepared by using a low-cost, simple, and green process as follows. Fourier-transform infrared spectra, X-ray diffraction, EDX, field-emission scanning electron microscopy, thermal analysis, TEM analysis, and vibrating sample magnetometer measurements have been used to characterize the bionanocomposite. Some important reasons for the novelty of the bionanocomposite are that due to a large number of hydroxyl and phenolic hydroxyl groups in the tannic acid cooper cooperates well and also increases catalytic activity of bionanocomposite for selective oxidation of alcohols. The most important aspect of the bionanocomposite is that synthesized from biomaterial that makes the selective oxidation of alcohols to aldehyde and ketones green and environmentally friendly. Besides, due to the unique morphology of the bionanocomposite, it operates as an impressive bionanocatalyst. Afterward, the synthesized bionanocomposite was operated as a highly effective heterogeneous catalyst for selective oxidation of alcohols. High-to-excellent yields, short reaction time, easy separation of the nanocatalyst, easy work-up, and non-toxicity are several advantages of this protocol. Likewise, the calculated TONs and TOFs values proved the noteworthy performance of the bionanocomposite in the preparation of aldehyde and ketones. Because of the morphology of bionanocomposite, Fe3O4@tannic acid-Cu has a large surface active area that caters to high catalytic activity.
Materials Research Express, 2020
Method development for surface functionalization of vinyl-coated iron oxide nanoparticles via [4 ... more Method development for surface functionalization of vinyl-coated iron oxide nanoparticles via [4 + 2] one-pot cycloaddition is presented in this work. Small molecules are loaded onto the surface of silica-coated magnetic nanoparticles (Fe3O4/SiO2 NPs) by various methods. The main factors such as surface modification ratio, core/shell structure maintenance, spherical morphology preservation and particle size uniformity were precisely investigated by various analyses. In this regard, reflux, microwave and ultrasound wave irradiation have been well compared as three different effective methods for carrying out the cycloaddition (CA) reactions onto the surface of magnetic nanoparticles. Overall, it was concluded that the safer and faster method for this purpose is implemented by the ultrasound wave irradiation.
Catalysis Communications, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Ultrasonics Sonochemistry, 2019
Synergistic catalytic effect between ultrasound waves and pyrimidine-2,4-diamine-functionalized m... more Synergistic catalytic effect between ultrasound waves and pyrimidine-2,4-diamine-functionalized magnetic nanoparticles: Applied for synthesis of 1,4-dihydropyridine pharmaceutical derivatives
ACS Omega, 2019
Proportional to considerable progress in protein− drug conjugations, attention to the efficient p... more Proportional to considerable progress in protein− drug conjugations, attention to the efficient peptide coupling reagents is being increased. Hence, in this study, a versatile heterogeneous nanoscale reagent is presented for chemical, biological, and medical purposes. A combination of silver and silica-coated iron oxide nanoparticles (Ag/Fe 3 O 4) has been well functionalized with isothiazolone rings via a silver-modified Heck mechanism. An appropriate condition is provided for peptide bond formation through the surface interplay between silanol groups and the loaded isothiazolone rings. A logical mechanism including a series of successive covalent bonds onto the surface of Ag/Fe 3 O 4 nanocomposites is suggested for this catalyzed peptide bond formation. Accurate comparisons have been made to obtain the optimum value of the nanocatalyst and suitable conditions. As an additional application, the biological activity of the desired product has also been investigated through antibacterial assay tests. The results showed that our desired product could also be used as an effective heterogeneous nanoscale antibacterial agent for different purposes. In this regard, all of the essential structural and practical analyses have been carried out and precisely interpreted.
Materials Today Chemistry, 2019
Recently, attention to magnetic nanoparticles has been increased because of their extreme active ... more Recently, attention to magnetic nanoparticles has been increased because of their extreme active surface area, composition, and magnetic separation capability. In this regard, a magnetic nanocatalyst system was designed and used for facilitating one-pot synthesis of pyrano[2,3-d]pyrimidine derivatives. This product takes advantages of copper(II) ions chelated with oxygen atoms of polyvinyl alcohol (PVA) strands, which were well composited with iron oxide magnetic nanoparticles during an in situ process. High reaction yields were obtained by using this efficient nanocatalyst in the short times and under mild conditions. High hydrophilicity, convenient separation, and acceptable recyclability have been investigated and introduced as the features of this nanocatalyst. Structural studies related to the nanoscale materials have also been carried out and well interpreted in this report.
Polyhedron, 2019
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Facile synthesis of tetrazolo[1,5-a]pyrimidine with the aid of an effective gallic acid nanomagnetic catalyst
Nano-Structures & Nano-Objects, 2019
Abstract Polyvinyl alcohol is a suitable substrate for the catalysis of the organic reactions due... more Abstract Polyvinyl alcohol is a suitable substrate for the catalysis of the organic reactions due to the large amount of hydroxyl functional groups. In this research, a new approach for in-situ preparation of Fe3O4@PVA nanostructure as well as its sulfonation was investigated. Then, the functional groups of the prepared nanocatalyst was characterized by Fourier transform infrared (FT-IR) spectroscopy. The size and morphology of the nanoparticles were tested by using scanning electron microscopy (SEM) images. The presence of constructive elements in the nanocomposites was confirmed by energy dispersive X-ray (EDX) analysis. To better insight, the structure and magnetic properties of the prepared nanostructure was studied by X-ray diffraction (XRD) pattern and vibrating sample magnetometer (VSM) analysis. Thermal stability and weight loss for the nanostructure composition at each step of weight change were screened by thermogravimetric analysis (TGA). Finally, the nanocomposite structure prepared was confirmed by transmission electron microscope (TEM) image. Then, for the first time, Fe3O4@PVA sulfonic acid–based superparamagnetic nanocatalyst was studied for the synthesis of 2,4,5-triarylimidazoles derivatives via a one-pot three-component condensation reaction starting from between ammonium acetate, aldehyde derivatives and benzil or benzoin. Due to high magnetic property of the catalyst, it was easily recyclable by a magnet at least for ten runs without any significantly reducing of catalytic activity.
BMC Chemistry, 2019
For the first time, the design and preparation of magnetic polyvinyl alcohol (Fe 3 O 4 @PVA) nano... more For the first time, the design and preparation of magnetic polyvinyl alcohol (Fe 3 O 4 @PVA) nanocomposite film as a novel nanocatalyst was accomplished by in situ precipitation method. To enhance the catalysis activity, the surface modification of this nanocomposite was carried out by sulfonic acid. After the synthesis of this nanocomposite film, Fourier-transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray (EDX) analysis, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) images, X-ray diffraction (XRD) pattern, N 2 adsorption-desorption by Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM) were utilized to confirm the structure of the nanocomposite. The catalytic activity of Fe 3 O 4 @PVA was investigated by the synthesis of dihydropyrimidine derivatives from an aldehyde, ß-ketoester and urea or thiourea. This heterogeneous nanocatalyst can be easily separated by an external magnet and reused for several times without any significant loss of activity. Simple work-up, mild reaction conditions and easily recoverable catalyst are the advantageous of this nanocomposite film.