Elham Tahanpesar
@iauahvaz.ac.ir
Islamic Azad University, Ahvaz Branch, Iran
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Fatemeh Mirsalari, Elham Tahanpesar, and Haleh Sanaeishoar
Springer Science and Business Media LLC
Zahra Baymaninezhad, Haman Tavakkoli, Seyyed Jafar Saghanezhad, and Elham Tahanpesar
Springer Science and Business Media LLC
Shokouh Khodayar, Mohammad Reza Shushizadeh, Elham Tahanpesar, Behzad Sharif Makhmalzadeh, and Haleh Sanaeishoar
Bentham Science Publishers Ltd.
Aims: The aim of the study was to extract and characterize alginate from a new source, conduct synthesis and characterization of novel aminated alginate derivatives, make a comparison of physicochemical properties of extracted sodium alginate with its aminated derivatives, and investigate the effect of diamines chain length on physicochemical properties of newly synthesized derivatives. Background: Alginate is a natural biopolymer found in marine brown seaweeds. Alginate is widely used in the industry due to its features, such as gelling ability, biocompatibility, biodegradability, hydrophilicity, and non-toxicity. Alginate has two types of functional groups, free hydroxyl and carboxyl groups, which can be modified. Methods: In this study, sodium alginate was extracted from sargassum boveanum in basic media and characterized by physical and spectral properties. In order to prepare alginate precursors with clickable groups for hydrogel cross-linking application, extracted sodium alginate was further treated with two different diamines, diaminoheptane (DAH) and diaminopropane (DAP), in the presence of 1-ethyl-3- (3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) to form amide linkages on the alginate backbone and synthesise aminated derivatives. The products were characterized by techniques, such as FTIR, 1HNMR, TGA, XRD, and elemental analysis. Results: The average molar weight and the intrinsic viscosity of alginate from Sargassum bovaneum with a yield of 24.38% were 41.53 kDa and 0.9 dL/g 105 cps (2.5% C). Results showed that as the alginate concentration increased, the flow rate decreased with a mild slope. Conclusion: Elemental analysis (CHNS) of alginate derivatives indicated the percent of amine groups to be increased after amination reaction in comparison to corresponding alginates. The thermal analysis results indicate that the thermal stability of the sodium alginate is better than graft copolymers. Synthetic derivatives showed no particular sensitivity to environmental stimuli, such as temperature and pH changes.
Asieh Azhdari, Najmedin Azizi, Haleh Sanaeishoar, and Elham Tahanpesar
Informa UK Limited
ELHAM DAVOODI, ELHAM TAHANPESAR, and AHMAD REZA MASSAH
Springer Science and Business Media LLC
Forough Mohammadi, Haleh Sanaeishoar, and Elham Tahanpesar
Informa UK Limited
M. Darband, E. Tahanpesar, H. Sanaeishoar, and R. Badri
Pleiades Publishing Ltd
A novel and green method for the preparation of cobalt oxide nanosheets using pyridinium-based ionic liquid by simple reflux method is described in the present work. Pyridinium-based ionic liquid, N-butyl pyridinium bromide [BuPy]Br plays an important role as reaction media and morphology template to control Co3O4 nanostructures. This catalyst is characterized by XRD, FE-SEM, FT-IR, VSM and UV-Visible spectroscopy. Further, this nanocatalyst is used to catalyzes the condensation reaction of o-amino thiophenol with α,β-unsaturated ketones for preparation of 1,5-benzothiazepine derivatives in excellent yields. This efficient catalyst could be recovered and reused several times without any significant loss of activity.
M. Darband, E. Tahanpesar, R. Badri, and H. Sanaeishoar
Pleiades Publishing Ltd
Synthesis of Co3O4 nanostructures with morphologies of nanoparticles and nanosheets were successfully achieved by reflux method in the presence of pyridinium based ionic liquids, N-butylpyridinium bromide [BuPy]Br and N-octylpyridinium bromide [OPy]Br. The ionic liquid plays an important role as reaction media and morphology template to control Co3O4 nanostructures. Different morphologies of Co3O4 nanostructures were obtained by changing the ratio of the NaOH to Co(NO3)2·6H2O. The structure, morphology, and properties of prepared Co3O4 nanostructures were characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), vibrating sample magnetometer (VSM) and UV-visible spectroscopy. SEM and X-ray powder diffraction results showed that the Co3O4 nanostructures were obtained with smaller crystallite sizes by using butyl pyridinium ionic liquid with a shorter alkyl side chain. The results of optical measurements illustrate the blue shift of the bandgap using ILs. Furthermore, the ferromagnetic behavior of Co3O4 nanostructures was confirmed in magnetic measurement by the presence of a hysteresis loop.
Elham Davoodi, Elham Tahanpesar, and Ahmad Reza Massah
Wiley
Fatemeh Lashkari, Rashid Badri, and Elham Tahanpesar
Springer Science and Business Media LLC
A facile process for the efficient synthesis of a new catalyst is reported by immobilization of Mn(II) on Fe3O4@Schiff base. This catalyst is applied for the synthesis of Hantzsch hydroquinoline derivatives. Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction and transmission electron microscopy analysis were used for the characterization of the as-synthesized catalyst. The products of Hantzsch reaction were characterized using 1H-NMR and FT-IR spectroscopies. Owing to its good magnetic property confirmed by vibrating sample magnetometer analysis, the as-prepared catalyst can be extracted from the reaction mixture easily and apply in the next catalytic cycle. In comparison to the same reactions, this method exhibits the advantages of short reaction times, higher yields, low catalyst loading, easy catalyst separation, catalyst reusability and low cost.
Asieh Azhdari, Najmedin Azizi, Haleh Sanaeishoar, and Elham Tahanpesar
Springer Science and Business Media LLC
A novel heterogeneous acidic catalyst was prepared by in situ immobilization of amidosulfonic acid (NH2SO3H) on graphitic carbon nitride (g-C3N4) under hydrothermal conditions. The textural morphology of NH2SO3H/g-C3N4 nanocomposite was characterized via powder X-ray diffraction, FT-IR, TGA, EDX, and scanning electron microscopy. The spatial arrangement of the amidosulfonic acid on the surface of g-C3N4 leads to the construction of a unique solid acid structure, resulting in a substantial enhancement of catalytic activity toward a high efficient preparation of pyrroles by Paal–Knorr reaction. The reactions undergo completion readily with good to excellent yields, with simple purification in an environmentally friendly manner. The NH2SO3H/g-C3N4 nanocomposite can be readily recycled, and no noteworthy reduction in the catalytic activity detected after four runs.
Mohammad Reza Asghariganjeh, Ali Asghar Mohammadi, Elham Tahanpesar, Ayeh Rayatzadeh, and Somayeh Makarem
Springer Science and Business Media LLC
Abstract Electro-synthesis through a one-pot three-component condensation of corresponding aldehydes, Meldrum’s acid, and 2-(nitromethylene)imidazolidine resulted in a series of novel tetrahydroimidazo[1,2- a ]pyridine-5(1 H )-one derivatives containing an electronegative pharmacophore (=CNO 2 ). The process was carried out in propanol medium with sodium bromide presented as electrolyte, inside an undivided cell with good to excellent yields. As a powerful entry into fused polycyclic structures related to bioactive heterocycles, this green protocol shows great potential. Graphic abstract
Fatemeh Lashkari, Rashid Badri, and Elham Tahanpesar
Springer Science and Business Media LLC
A simple procedure for the synthesis of functionalized magnetic iron oxide supported sulfonic acid (Fe3O4@SiO2–Pr–NH2–SO2CH3) is reported. The product was characterized using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and energy-dispersive analysis of X-ray (EDAX). SEM analysis exhibits homogeneous dispersion of spherical nanoparticles for Fe3O4@SiO2–Pr–NH2–SO2CH3. The as-prepared catalyst was applied in Knoevenagel condensation of benzaldehyde derivatives with ethyl cyanoacetate in solvent-free condition at 80 °C. The products were obtained in high-to-excellent yields at short times. The catalyst can be extracted and reused in the next reaction cycle by using an external magnet.
The synthesis of heterogeneous basic magnetic catalyst is developed which is applied as efficient catalyst in Knoevenagel condensation of benzaldehyde derivatives with ethyl cyanoacetate. The coating of Fe3O4 magnetic NPs with silica followed by functionalization with organic and inorganic compounds is very effective and valuable process. The as-prepared catalyst exhibited interesting catalytic activity in solvent-free conditions.
Elham Manouchehrizadeh, Azar Mostoufi, Elham Tahanpesar, and Masood Fereidoonnezhad
Springer Science and Business Media LLC
Dichloroacetate (DCA) is a small anticancer agent acting through inhibition of pyruvate dehydrogenase kinases (PDKs) and preventing proliferation of tumor growth. In this study, a series of new piperidine and piperazine derivatives of DCA were designed and subjected to molecular docking analysis. Based on the docking results, nine compounds with a lowest binding energy and better interaction with PDK isoenzymes were selected and synthesized. The cytotoxic activities of the synthesized compounds were evaluated against HT-29 and MCF7 human cancer cell lines. These compounds showed moderate potency and much higher anticancer activity than DCA. The most active compound of the series ( f1 ) showed IC 50 value of 7.79 μM against HT-29 cell line.
Fatemeh Malamiri, Samad Khaksar, Rashid Badri, and Elham Tahanpesar
Bentham Science Publishers Ltd.
Aim and Objective: An efficient and practical procedure for the synthesis of heterocyclic compounds such as quinazolines, quinoxalines and bis(indolyl)methanes was developed using 3,5-bis(trifluoromethyl) phenyl ammonium hexafluorophosphate (BFPHP) as a novel organocatalyst. Material and Method: All of the obtained products are known compounds and identified by IR, 1HNMR, 13CNMR and melting points. Results: Various products were obtained in good to excellent yields under reaction conditions. Conclusion: The BFPHP organocatalyst demonstrates a novel class of non-asymmetric organocatalysts, which has gained much attention in green chemistry.
Hossein Filian, Arash Ghorbani-Choghamarani, and Elham Tahanpesar
Springer Science and Business Media LLC
In this work, the surface of mesoporous MCM-41 was modified with guanidine, and then, Nickel particles have become immobilized on its surface (Ni-guanidine@MCM-41NPs). This heterogeneous catalyst has been identified by various techniques including: low-angle X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, inductively coupled plasma, thermal gravimetric analysis and N2 adsorption–desorption measurement isotherms, and its catalytic application was studied in the synthesis of 4,4ʹ-(arylmethylene)-bis-(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives and symmetric di-aryl sulfides. The prepared organometallic complex could be isolated, post-reaction, by simple filtration for several consecutive cycles without a notable change in its catalytic activity.
Hossein Filian, Arash Ghorbani-Choghamarani, and Elham Tahanpesar
Springer Science and Business Media LLC
A new catalyst of palladium containing guanidine as stabilizer ligand grafted on functionalized MCM-41 (Pd(0)-guanidine@MCM-41) was prepared during post-grafting procedure and characterized by SEM, EDS, WDX, BET, TEM, TGA, ICP and FT-IR techniques. Further this catalyst was used as efficient and recyclable nanocatalyst for the carbon–carbon cross-coupling reactions such as Suzuki and Stille reactions. Biphenyls were synthesized in short reaction times and high yields in the presence of this catalyst. This catalyst was reused up to 10 times in Suzuki reaction that shows high recyclability of this catalyst.
E. Tahanpesar, H. Tavakkoli, and S. Hadikhani
Pleiades Publishing Ltd
High-surface-area Co3O4 nanoparticles have been prepared as a potential heterogeneous catalyst by the sol-gel method using starch as an inexpensive and a nontoxic starting material. Evidence showing that the cobalt precursor had been completely coverted into a pure crystalline Co3O4 phase with a cubic structure was obtained by X-ray diffraction analysis. The average particle size was estimated at 24 nm. The prepared catalyst was used in the synthesis of benzimidazoles. The developed methodology offers the advanvages of high yields (70–95%) and short reaction times (35–95 min) and avoids the use of toxic organic solvents. All of the reactions were carried out in the presence of Co3O4 nanoparticles (0.01 g) at 80°C under solvent-free conditions. The catalyst could be recovered and reused without any significant loss of activity.
N. Kakesh, S. Sayyahi, R. Badri, and E. Tahanpesar
Pleiades Publishing Ltd
A new imidazolium-based poly(ionic liquid) has been synthesized and used as a robust heterogeneous catalyst for the preparation of phenacyl derivatives by an SN2 reaction of different phenacyl bromides with a broad range of nucleophiles. The products are obtained in high yields under mild conditions. The catalyst can be recycled efficiently.
Elham Manouchehrizadeh, Azar Mostoufi, Elham Tahanpesar, and Masood Fereidoonnezhad
Elsevier BV
A series of novel tacrine derivatives as multifunctional agents with potential inhibitory effects on both acetylcholinesterase(AChE) and butyrylcholinesterase (BuChE) enzymes for the treatment of Alzheimer's disease(AD), were applied to alignment independent 3D-QSAR methods using Pentacle software. In this studies, GRID-independent molecular descriptors (GRIND) analysis have been applied to characterize important interactions between enzymes and the studied compounds. Two H-bond acceptor groups as well as hydrophobic properties of tacrine rings for AChE and two H-bond acceptor on the carbonyl group of chromene and NH of amid group for BuChE, with positive effects on their inhibitory potency have been identified. The obtained 3D-QSAR models have been analyzed and validated. The statistical quality of the QSAR model for AChE, r2 = 0.87, q2 = 0.56 and for BuChE, r2 = 0.96, q2 = 0.70 was resulted. Using these models, novel structures have been designed and pIC50 of them were predicted. Molecular docking studies were also conducted on AChE (1ACJ) and BuChE (4BDS) and promising results in good agreement with 3D-QSAR studies were obtained.
Fatemeh Malamiri, Samad Khaksar, Rashid Badri, and Elham Tahanpesar
Bentham Science Publishers Ltd.
Objective: An efficient and catalyst-free procedure for the synthesis of [1,2,4]triazolo/benzimidazolo quinazolinones has been developed in 2,2,2-trifluoroethanol or deep eutectic solvent(DESs) as a clean reaction media. Methods: All of the obtained products are known compounds and identified by IR, 1HNMR,13CNMR, and melting points. Results: Various products were obtained in good to excellent yields under reaction conditions. Conclusion: We have efficiently developed a practical and catalyst-free approach for the synthesis of [1,2,4]triazolo/benzimidazolo quinazolinones employing TFE as a clean and reusable media.
Forough Shahrouei, Shahla Elhami, and Elham Tahanpesar
Elsevier BV
A colorimetric assay with excellent sensitivity is reported to detect Ceftriaxone in aqueous and micellar solutions. Ceftriaxone could induce the aggregation of gold nanoparticles through hydrogen-bonding interaction and electrostatic attraction. As a result of aggregation, the surface plasmon resonance band around 520 nm decreases and a new band appears at 620 nm. The effect of surfactants was investigated on the aggregation. The band around 620 nm is shifted to around 685 nm in Triton X-100 micellar media and that is seen color conversion from red to deep blue which is clearly detectable by the naked eye. The results were improved in Triton X-100 micellar media as compared to aqueous media so that the lowest measured concentration and detection limit in micellar media have decreased 10 and 8 times, respectively. Triton X-100 showed strong effect on the stabilization of the solutions. The method has been successfully applied for the analysis of various real samples.
Somayeh Nazarzadeh, Arash Ghorbani-Choghamarani, and Elham Tahanpesar
Springer Science and Business Media LLC
Herein, Ni(II) immobilized on modified mesoporous silica MCM-41 was designed and synthesized via a facile sequential strategy. The structure of the catalyst was characterized by X-ray diffraction. The thermal property of the as-synthesized materials was studied using thermogravimetric-differential thermal analysis. The average particles size and morphology of MCM-41@XA@Ni(II) were investigated using scanning electron microscopy and transmission electron microscopy. This nanostructure catalyst was effective for the selective oxidation of sulfides and acetylation of alcohols in solvent-free conditions. The easy recyclability of the catalyst and their complete chemoselectivity toward the sulfur group of substrates in the oxidation of sulfides are important “green” attributes of this catalyst.
Mona Arfavi-Safari, Hossein Anaraki-Ardakani, Rashid Badri, and Elham Tahanpesar
SAGE Publications
An efficient and simple protocol for the synthesis of the title compounds is described via a one-pot, three-component reaction of 4-hydroxycoumarin, aryl glyoxals and amides, using SnCl2-SiO2 nanoparticles as a heterogeneous catalyst under solvent-free conditions. The advantages of this synthesis include excellent yields, mild reaction conditions, atom economy, a reusable catalyst and no need for chromatographic separations.
E. Tahanpesar and L. Sarami
Pleiades Publishing Ltd
The sulfonated sawdust (SD-SO3H) was easily prepared by treatment of sawdust, a biomass waste material, with chlorosulfonic acid and characterized by elemental analysis, SEM and TGA. The bio-degradable solid acid catalyst has been applied to the Pechmann condensation reaction of phenols with β-ketoesters for the synthesis of coumarin derivatives under solvent-free conditions. This environmentally benign and inexpensive method has such advantages as simplicity in operation, high yields, low catalyst loading and short reaction time. The catalyst can be efficiently recycled with insignificant loss of activity.