Original Research Article
Organic chemistry
Maryam Dashtizadeh; Maryam Khalili; Fatemeh Reghbat; Eshagh Abdi; Zahra Bahadori; Zahra Sadripour; Abdolkarim Zare; Khadijeh Didehban; Seyed Sajad Sajadikhah
Abstract
In this research, a Brønsted acidic ionic liquid namely N1,N1,N2,N2-tetramethyl-N1,N2-bis(sulfo)ethane-1,2-diaminium chloride {[TMBSED][Cl]2} was employed as a highly efficient catalyst for the solvent-free production of some nitrogen- and oxygen-containing heterocyclic compounds including: (i) ...
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In this research, a Brønsted acidic ionic liquid namely N1,N1,N2,N2-tetramethyl-N1,N2-bis(sulfo)ethane-1,2-diaminium chloride {[TMBSED][Cl]2} was employed as a highly efficient catalyst for the solvent-free production of some nitrogen- and oxygen-containing heterocyclic compounds including: (i) polyhydroquinolines (from arylaldehydes, dimedone, β-ketoesters and ammonium acetate), (ii) 3,4-dihydropyrimidin-2-(1H)-ones/thiones (from arylaldehydes, β-ketoesters and urea/thiourea), and (iii) 14-aryl-14H-dibenzo[a,j]xanthenes (from aromatic aldehydes and β-naphthol). In all cases, the heterocycles were obtained in high yields and in short reaction times. The salient features of using [TMBSED][Cl]2 in the reactions, include effectiveness, generality, simple preparation of the catalyst from inexpensive and easy available reactants, achieving the reactions under solvent-free conditions, synthesis of the products with high yields in short reaction times and need to milder conditions compared with many reported methods for the preparation of the aforesaid organic compounds.
Original Research Article
Nanochemistry
Ebrahim Teymoori; Abolghasem Davoodnia; Amir Khojastehnezhad; Nasrinsadat Hosseininasab
Abstract
In this research, a new magnetic nanocatalyst CuFe2O4@Si-Imid-PMo containing acidic ionic liquid based on imidazolium cation and phosphomolybdic acid anion immobilized on CuFe2O4@SiO2 magnetic nanoparticles was prepared and characterized using FT-IR, EDX, SEM, and VSM techniques. Then, the catalytic ...
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In this research, a new magnetic nanocatalyst CuFe2O4@Si-Imid-PMo containing acidic ionic liquid based on imidazolium cation and phosphomolybdic acid anion immobilized on CuFe2O4@SiO2 magnetic nanoparticles was prepared and characterized using FT-IR, EDX, SEM, and VSM techniques. Then, the catalytic activity of CuFe2O4@Si-Imid-PMo was evaluated in the synthesis of 2,4,5-trisubstituted imidazoles. The results showed that the catalyst has high activity and the desired products were obtained in high yields within short reaction times. The best result was obtained at 120 °C in the presence of 0.02 g of the catalyst under solvent-free conditions. The catalyst was also readily recovered by a external magnetic and can be used for several times without substantial reduction in its catalytic activity.
Original Research Article
Analytical chemistry
Roghiyeh Pourghobadi; Mohammad Reza Baezzat
Abstract
The present study examines a new dopamine sensor based on Alumina nanoparticles modified carbon paste electrode (Al2O3NPsCPE). Moreover, the present study focuses on the electrochemical act of the Al2O3NPsCPE for the detection of dopamine by cyclic voltammetry (CV) and differential pulse voltammetry ...
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The present study examines a new dopamine sensor based on Alumina nanoparticles modified carbon paste electrode (Al2O3NPsCPE). Moreover, the present study focuses on the electrochemical act of the Al2O3NPsCPE for the detection of dopamine by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). There is also a focus on the specification of the prepared modified electrode by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM), and there is a discussion on the influence of some experimental variables such as carbon paste composition, laboring solution pH, scan rate and possible interferences. The present study obtained a well-defined redox peak of dopamine (DA) on the Nano- Alumina/CPE at Epa=173mV and Epc=112mV, respectively. The obtained response of the sensor was linear under the optimal conditions of the catalytic peak current, in the range of 8.0-330.0 µM, and the detection limit was 2.1 µM (S/N=3) for dopamine. The proposed sensor exhibited a high sensitivity, an excellent reproducibility, good selectivity, and it was successfully used in the determination of dopamine injection samples.
Original Research Article
Physical chemistry
Ashraf M Ashmawy; Maher I Nessim; Doaa I Osman; El Sayed M Elnaggar
Abstract
Four liquid crystal compounds of the form, 2-Sec-butyl-4-[(4-x-phenyl) diazenyl) phenyl-4-(octadecyloxy] benzoate symbolized as I18a, I18b, I18c and I18d were prepared in which the substituent (X) was taken CH3O-, CH3-, Br- and -NO2 respectively. Characterization of prepared compounds is done using FT-IR, ...
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Four liquid crystal compounds of the form, 2-Sec-butyl-4-[(4-x-phenyl) diazenyl) phenyl-4-(octadecyloxy] benzoate symbolized as I18a, I18b, I18c and I18d were prepared in which the substituent (X) was taken CH3O-, CH3-, Br- and -NO2 respectively. Characterization of prepared compounds is done using FT-IR, 1H-NMR, Mass Spectroscopy and Elemental Analysis.. Their mesophase behavior was investigated by Differential Scanning Calorimetry (DSC). Their antioxidant efficiency for Egyptian lubricating base oil was tested. The oxidation processes was monitored using the change in the Total Acid Number (TAN). The obtained results showed that, the efficiency of these compounds was ranked as follows I18d > I18c > I18b > I18a.
Short communication
Nanochemistry
Ardeshir Khazaei; Ahmad Reza Moosavi-Zare; Saeed Firoozmand
Abstract
3-methyl-1-sulfonic acid imidazolium tetrachloroferrate {[Msim]FeCl4} as an efficient sulfur catalyst was prepared and applied, as an efficient catalyst, for the cross-aldol condensation reaction between cycloalkanones and arylaldehydes to give α,αʹ- bis(arylidene)cycloalkanones in high ...
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3-methyl-1-sulfonic acid imidazolium tetrachloroferrate {[Msim]FeCl4} as an efficient sulfur catalyst was prepared and applied, as an efficient catalyst, for the cross-aldol condensation reaction between cycloalkanones and arylaldehydes to give α,αʹ- bis(arylidene)cycloalkanones in high yields and short reaction times at 75 °C under solvent-free conditions. 3-methyl-1-sulfonic acid imidazolium tetrachloroferrate {[Msim]FeCl4} as an efficient sulfur catalyst was prepared and applied, as an efficient catalyst, for the cross-aldol condensation reaction between cycloalkanones and arylaldehydes to give α,αʹ- bis(arylidene)cycloalkanones in high yields and short reaction times at 75 °C under solvent-free conditions. 3-methyl-1-sulfonic acid imidazolium tetrachloroferrate {[Msim]FeCl4} as an efficient sulfur catalyst was prepared and applied, as an efficient catalyst, for the cross-aldol condensation reaction between cycloalkanones and arylaldehydes to give α,αʹ- bis(arylidene)cycloalkanones in high yields and short reaction times at 75 °C under solvent-free conditions.
Original Research Article
Organic chemistry
Mohammad Reza Asaadi; Hosein Behmadi; Abdolhossein Massoudi; Mohammad Shaker
Abstract
Pyrene and its derivatives exhibit thermal stability, high extinction coefficients, excimer formation, high photoluminescence, long fluorescence lifetime, fluorophoric properties and enhanced charge carrier mobility which make them find applications in optoelectronic area and are useful as large planar ...
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Pyrene and its derivatives exhibit thermal stability, high extinction coefficients, excimer formation, high photoluminescence, long fluorescence lifetime, fluorophoric properties and enhanced charge carrier mobility which make them find applications in optoelectronic area and are useful as large planar synthetic building blocks in supramolecular chemistry. One of the approaches to overcome this downside is the introduction of bulky aryl/alkyl substituents or incorporation heteroatoms into the π-extended conjugated system of pyrene. In this work, Some new derivatives of 4-Aryl-2, 6-di(pyren-1-yl)pyridines have been synthesized through one-pot reaction and were formed with cyclization of Arylaldehydes, 1-acetylpyrene and ammonium acetate in acetic acid. The products were confirmed by FT-IR, Mass, 1H-NMR, 13C-NMR and elemental analysis. These new compounds were subsequently studied for their fluorescence properties.
Original Research Article
Nanochemistry
Roya Ahmadi; Mohammad Reza Jalali Sarvestani
Abstract
In this study, the performance of fullerene (C20) and boron nitride cage (B12N12) as a sensing material for detection of proline was evaluated by density functional theory. For this purpose, the structures of proline, C20, B12N12 and the derived products from the proline adsorption on the surface of ...
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In this study, the performance of fullerene (C20) and boron nitride cage (B12N12) as a sensing material for detection of proline was evaluated by density functional theory. For this purpose, the structures of proline, C20, B12N12 and the derived products from the proline adsorption on the surface of nanostructures were optimized geometrically. Then, IR and Frontier molecular orbital calculations were performed on them. The obtained adsorption energies, enthalpy changes (ΔHad) and Gibbs free energy variations (ΔGad) demonstrate that proline adsorption on the surface of the boron nitride cage is exothermic, spontaneous and experimentally feasible. Whilst, the proline interaction with C20 is endothermic, non-spontaneous and experimentally impossible. The effect of temperature on the adsorption process was also checked out and the results reveal that 298 K is the best temperature for the adsorption procedure. The Calculated specific heat capacity values show that boron nitride cage can be utilized as a sensing material in the construction of thermal biosensors for proline determination. The calculated molecular orbital parameters indicate that B12N12 could be used as a neutral ion carrier and also an electroactive sensing material in the development of potentiometric and conductometric biosensors. All of the calculations were implemented by density functional theory method and B3LYP/6-31G(d) basis set.
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