Publications (86)156.06 Total impact
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Dataset: Arkivoc, 2007,P2O5 Bis(indolyl)
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Article: Selective homogeneous liquid-liquid extraction and preconcentration of copper(II) into a micro droplet using a benzo-substituted macrocyclic diamide, and its determination by electrothermal atomic absorption spectrometry
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ABSTRACT: A fast and reliable method was developed for the selective separation and preconcentration of Cu2+ ions using homogeneous liquid-liquid extraction using a novel benzo-substituted macrocyclic diamide, 5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioatriazacyclo-pentadecine-3,11(4 H,12 H)-dione, as a selective complexing agent. An aqueous solution of Zonyl FSA (FSA) was used as a phase-separation agent at pH 4.5. Electrothermal atomic absorption spectrometry was used for Cu2+ determination after preconcentration. The influences of pH, type and volume of the water-miscible organic solvent, concentration of FSA, concentration of the ligand and the effect of diverse ions were investigated. Factorial design and response surface methods were used for the optimization purposes. Under the optimum experimental conditions, 50ng of Cu2+ in 5mL aqueous sample could be extracted quantitatively into 76µL of the sediment phase. The maximum preconcentration factor was 65. The calibration curve was linear in the concentration range 0.2 to 4.0µgL−1. The detection limit and relative standard deviation were 4ngL−1 and 4.6%, respectively. The method was successfully applied to the extraction and determination of Cu2+ in natural water samples.Microchimica Acta 04/2012; 168(1):115-121. · 3.03 Impact Factor -
Article: Effects of solvent and substituent on the electronic absorption spectra of some substituted Schiff bases: a chemometrics study.
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ABSTRACT: A series of Schiff bases were studied for their delicate changes in absorption electronic spectra by changing substituents and solvents. UV/vis absorbance spectra of Schiff base derivatives of different substituents ranging from electron withdrawing to electron donating (Br, CF(3), Cl, CN, CO(2)H, F, Me, NO(2), OH, OMe, H) were studied in different solvents (acetonitrile, chloroform, cyclohexane, dioxane, dimethylsulfoxide and methanol). Linear relationships were established to investigate the effect of solute structure and solvatochromic parameters of solvents on the absorbance spectra. Meaningful chemical factors and then regression models were provided utilizing factor analysis (FA) and multiple linear regression (MLR). It was found that the frequency of maximum absorbance was mainly controlled by the solvent's dipolarity/polarizability. The λ(max) of the ortho-nitro derivative represented the largest dependency on solvents' polarity/polarizability so that it can be used as a solvatochromic probe.Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 01/2012; 91:198-205. · 2.10 Impact Factor -
Article: Synthesis, characterisation and application of two new lariat crown ethers in construction of PVC membrane, coated wire and coated graphite electrodes: application to flow injection potentiometry
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ABSTRACT: Two lariat crown ethers, 7-(2-Hydroxy-5-methylbenzyl)-5,6,7,8,9,10-hexahydro-2H-benzo[b][1,4,7,10,13]pentadecine-3,11(4H,12H)dione, L1 and, (7-(5-tert-buthyl-2-hydroxybenzyl)-5,6,7,8,9,10-hexahydro-2H-benzo[b][1,4,7,10,13]dioatriazacyclopentadecine-3,11 (4h, 12, H) dione, L2 was synthesised, characterised and used as active components for fabrication of PVC membrane electrode (PME), coated graphite electrode (CGE) and coated wire electrodes (CWE) for sensing Co2+ ion. Potassium tetrakis(p-cholorophenyl) borate(KTpClPB) and o-nitrophenyloctyl ether (o-NPOE) were used as anion excluder and plasticiser, respectively, in a PVC matrix. The two lariat ethers were tested, L1 has shown better electrode characteristics than the other. The electrodes exhibited linear Nernstian responses to Co2+ ion in the linear concentration range of 3.3 × 10−6–1.9 × 10−2 M (for PME), 2.3 × 10−7–7.9 × 10−2 M (for CWE), and 5.0 × 10−8–1.2 × 10−2 M (for CGE). The CGE was used as a proper detection system in flow-injection potentiometry (FIP) with a linear Nernstian range of 2.3 × 10−7–1.2 × 10−2 M. Over a pH range of 3.2 to 8.0, the limit of detection for PME, CWE, CGE, and CGE-FIP systems were found to be 1.2 × 10−6, 2.5 × 10−7, 3.5 × 10−8 and 1.0 × 10−7 M, respectively. The electrodes revealed fairly good discriminating ability towards Co2+ in comparison with a large number of alkali, alkaline earth, transition and heavy metal ions. The electrodes were found to be chemically inert, showing fast response time of <5 s, and could be used practically over a period of 1 month. CGE has also been used for measurement of Co2+ in binary mixtures.Intern. J. Environ. Anal. Chem. 01/2011; 91(1):33-48. -
Article: Synthesis and characterization of novel ion-imprinted polymeric nanoparticles for very fast and highly selective recognition of copper(II) ions.
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ABSTRACT: This work reports the preparation of new Cu(2+) ion-imprinted polymeric nanoparticles using 1-hydroxy-4-(prop-2'-enyloxy)-9,10-anthraquinone (AQ) as a vinylated chelating agent. The Cu(2+) ion found to form a stable 1:1 complex with AQ in methanol solution. The resulting Cu(2+)-AQ complex was copolymerized with ethyleneglycol dimethacrylate, as a cross-linking monomer, via precipitation polymerization method. The imprint copper ion was removed from the polymeric matrix using a 0.1 mol L(-1) HNO(3) solution. The Cu(2+)-imprinted polymeric nanoparticles were characterized by IR spectroscopy, scanning electron microscopy (SEM) and N(2) adsorption-desorption isotherms. The SEM micrographs showed colloidal nanoparticles of 60-100 nm in diameter and slightly irregular in shape. Optimum pH for maximum sorption was 7.0. Sorption and desorption of Cu(2+) ion on the IIP nanoparticles were quite fast and achieved completely over entire investigated time periods of 2-30 min. Maximum sorbent capacity and enrichment factor of the prepared IIP for Cu(2+) were 73.8 μmol g(-1) and 56.5, respectively. The relative standard deviation and limit of detection (C(LOD)=3S(b)/m) of the method were evaluated as 2.6% and 0.1 ng mL(-1), using inductively coupled plasma-atomic emission spectrometry, respectively. It was found that the imprinting technology results in increased affinity of the prepared material toward Cu(2+) ion over other metal ions with the same charge and close ionic radius. The relative standard deviations for six and twenty replicates with the same nanoparticles were found to be 1.7% and 2.1%, respectively.Talanta 12/2010; 83(2):674-81. · 3.79 Impact Factor -
Article: Catalytic Friedel–Crafts Acylation and Benzoylation of Aromatic Compounds Using Activated Hematite as a Novel Heterogeneous Catalyst
Advanced Synthesis & Catalysis 11/2010; 352(17):3031 - 3044. · 6.05 Impact Factor -
Article: One‐Pot, Three‐Component Synthesis of 1‐(2‐Hydroxyethyl)‐1H‐1,2,3‐triazole Derivatives by Copper‐Catalyzed 1,3‐Dipolar Cycloaddition of 2‐Azido Alcohols and Terminal Alkynes under Mild Conditions in Water
Helvetica Chimica Acta 03/2010; 93(3):435 - 449. · 1.48 Impact Factor -
Article: Potentiometric Behavior of Co(II)-Meso-tetraarylporphyrin Derivatives as Ionophores in Anion-Selective Electrodes. Cross Sensitivity Studies
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ABSTRACT: Co(II)-meso-tetraarylporphyrin derivatives were studied as ionophores for polymeric membrane sensors for anions, and the cross-sensitivity of sensors were evaluated. It was found that the electrode displays a low cross-sensitivity and high selectivity to iodide ion. The iodide electrode exhibits a Nernstian response over a concentration range of 1.2 × 10−5 M–1.0 × 10−2 M with a detection limit of 9.0 × 10−6 M for the polymeric membrane electrode (PME) and 8.0 × 10−6 M–2.0 × 10−2 M with a detection limit of 7.5 × 10−6 M for the coated glassy carbon electrode (CGCE) in the pH range 3.0–7.0. The electrode possesses a fast response time, a satisfactory reproducibility and a good lifetime.Analytical Letters 01/2010; 43(1):161-175. · 1.02 Impact Factor -
Article: Multi-wavelength spectrophotometric determination of acidity constant of some newly synthesized Schiff bases and their QSPR study.
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ABSTRACT: The acidity constants of some newly synthesized Schiff base derivatives were determined by hard-model based multivariate data analysis of the spectrophotometric data in the course of pH-metric titration in 50% (v/v) methanol-water binary solvent. The employed data analysis method was also able to extract the pure spectra and pH-dependent concentration profiles of the acid-base species. The molecules that possess different substituents (both electron donating and withdrawing) on the ortho-, meta- and para-positions of one of the phenyl ring showed variable acidity constants ranging from 8.77 to 11.07 whereas the parent molecule had an acidity constant of 10.25. To investigate the quantitative effects of changing of substitution pattern on the acidity constant, a quantitative structure-property relation analysis was conducted using substituent constants and molecular descriptor. Some models with high statistical quality (measured by cross-validation Q(2)) were obtained. It was found that the acidity constant of the studied molecules in the methanol-water mixed solvent not only is affected by electronic features of the solutes but also by the lipophilic interaction between methanol part of solvent and the deprotonated solutes.Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2009; 75(1):340-6. · 2.10 Impact Factor -
Article: Immobilization of Porphyrinatocopper Nanoparticles onto Activated Multi‐Walled Carbon Nanotubes and a Study of its Catalytic Activity as an Efficient Heterogeneous Catalyst for a Click Approach to the Three‐Component Synthesis of 1,2,3‐Triazoles in Water
Advanced Synthesis & Catalysis 09/2009; 351(14‐15):2391 - 2410. · 6.05 Impact Factor -
Article: Lead-selective poly(vinyl chloride) electrodes based on some synthesized benzo-substituted macrocyclic diamides.
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ABSTRACT: A series of recently synthesized benzo- and pyridine-substituted macrocyclic diamides were studied to characterize their abilities as lead ion carriers in PVC membrane electrodes. The electrode based on 3,15,21-triaza-4,5;13,14-dibenzo-6,9,12-trioxabicycloheneicosa-1,17,19-triene-2,16-dione exhibits a Nernstian response for Pb2+ ions over a wide concentration range (1.3 x 10(-2) to 3.6 x 10(-6) mol L(-1)) with a limit of detection of 2.0 x 10(-6) mol L(-1) (0.4 ppm). The response time of the sensor is approximately 16 s, and the membrane can be used for more than two months without observing any deviation. The electrode revealed comparatively good selectivities with respect to many cations including alkali earth, transition and heavy metal ions. The proposed sensor could be used in pH range of 3.7-6.5. It was used as an indicator electrode in potentiometric titration of chromate ions with a lead ion solution.Journal of hazardous materials 08/2009; 172(1):68-73. · 4.14 Impact Factor -
Article: Novel PVC-membrane potentiometric sensors based on a recently synthesized sulfur-containing macrocyclic diamide for Cd2+ ion. Application to flow-injection potentiometry.
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ABSTRACT: A new sulfur-containing macrocyclic diamide, 1,15-diaza-3,4,12,13-dibenzo-5,11-dithia-8-oxa-1,15-(2,6-pyrido)cyclooctadecan-2,14-dione, L, was synthesized, characterized and used as an active component for fabrication of PVC-based polymeric membrane (PME), coated graphite (CGE) and coated silver wire electrodes (CWE) for sensing Cd(2+) ion. The electrodes exhibited linear Nernstian responses to Cd(2+) ion in the concentration range of 3.3 x 10(-6) to 3.3 x 10(-1)M (for PME, LOD=1.2 x 10(-6)M), 2.0 x 10(-7) to 3.3 x 10(-1)M (for CWE, LOD=1.3 x 10(-7)M) and 1.6 x 10(-8) to 1.3 x 10(-1)M (for CGE, LOD=1.0 x 10(-8)M). The CGE was used as a proper detection system in flow-injection potentiometry (FIP) with a linear Nernstian range of 3.2 x 10(-8) to 1.4 x 10(-1)M (LOD=1.3 x 10(-8)M). The optimum pH range was 3.5-7.6. The electrodes revealed fairly good discriminating ability towards Cd(2+) in comparison with a large number of alkali, alkaline earth, transition and heavy metal ions. The electrodes found to be chemically inert, showing a fast response time of <5s, and could be used practically over a period of about 2-3 months. The practical utility of the proposed system has also been reported.Journal of hazardous materials 07/2009; 172(2-3):566-73. · 4.14 Impact Factor -
Article: A facile and convenient method for the preparation of macrocyclic diamides
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ABSTRACT: A number of macrocyclic diamides have been synthesized from the reaction of a diacid dicarboxylic dichloride with primary diamino compound in the presence of magnesium oxide‐silica gel at room temperature in good yields. Using urea and thiourea as well as diamines to produce the corresponding macrocycles in the range of 52–56% yields are also included in this paper. One of the major advantages of this method is simple regeneration of inorganic solid and its reuse through several cycles without a decrease in activity.Journal of Heterocyclic Chemistry 03/2009; 36(3):601 - 606. · 1.22 Impact Factor -
Article: Methanesulfonic Acid/SiO2 as an Efficient Combination for the Synthesis of 2-Substituted Aromatic and Aliphatic Benzothiazoles from Carboxylic Acids
Synthetic Communications 03/2009; 39(5):860-867. · 1.06 Impact Factor -
Article: Al2O3/MeSO3H: A Novel and Recyclable Catalyst for One-Pot Synthesis of 3,4-Dihydropyrimidinones or Their Sulfur Derivatives in Biginelli Condensation
Synthetic Communications 03/2009; 39(6):958-979. · 1.06 Impact Factor -
Article: Copper Nanoparticles on Charcoal for Multicomponent Catalytic Synthesis of 1,2,3‐Triazole Derivatives from Benzyl Halides or Alkyl Halides, Terminal Alkynes and Sodium Azide in Water as a “Green” Solvent
Advanced Synthesis & Catalysis 01/2009; 351(1‐2):207 - 218. · 6.05 Impact Factor -
Article: An efficient and selective flourescent optode membrane based on 7-[(5-chloro-8-hydroxy-7-quinolinyl)methyl]-5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioxatriazacyclopentadecine-3,11(4H,12H)-dione as a novel fluoroionophore for determination of cobalt(II) ions.
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ABSTRACT: A novel fluorescence chemical sensor for the highly sensitive and selective determination of Co(2+) ions in aqueous solutions is prepared. The cobalt sensing system was prepared by incorporating 7-[(5-chloro-8-hydroxy-7-quinolinyl)methyl]-5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioxatriazacyclopentadecine-3,11(4H,12H)-dione (L) as a neutral cobalt-selective fluoroionophore in the plasticized PVC membrane containing sodium tetraphenylborate as a liphophilic anionic additive. The response of the sensor is based on the strong selective fluorescence quenching of L by Co(2+) ions. At a pH 5.0, the proposed sensor displays a calibration curve over a wide concentration range of 5.0 x 10(-7) to 2.0 x 10(-2)M with a relatively fast response time of less than 5 min. In addition to high stability and reproducibility, the sensor shows a unique selectivity towards Co(2+) ion with respect to common coexisting cations. The proposed fluorescence optode was successfully applied to the determination of cobalt content of vitamin B12 ampoule, cobalt cake, cobalt alloy and tap water samples.Analytica chimica acta 01/2009; 630(1):57-66. · 4.31 Impact Factor -
Article: Silica-Supported LiHSO4 as a Highly Efficient, Mild, Heterogeneous, and Reusable Catalytic System for the Solvent-Free Synthesis of Bis(indolyl)methanes
Phosphorus Sulfur and Silicon and the Related Elements 01/2009; 184:2508-2515. · 0.72 Impact Factor -
Article: Bis(2-hydroxy-benzaldehyde oxime) O,O'-butane-1,4-diyldicarbonyl ether.
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ABSTRACT: The mol-ecule of the title compound, C(20)H(20)N(2)O(6), lies across a crystallographic inversion centre, the asymmetric unit comprising one half-mol-ecule. An intra-molecular O-H⋯N hydrogen bond generates a six-membered ring, producing an S(6) ring motif. Pairs of inter-molecular C-H⋯O hydrogen bonds link neighbouring mol-ecules into a layer with R(2) (2)(38) ring motif. The crystal structure is further stabilized by the inter-molecular C-H⋯π inter-actions.Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 6):o1309. · 0.35 Impact Factor -
Article: Highly correlating distance/connectivity-based topological indices 5. Accurate prediction of liquid density of organic molecules using PCR and PC-ANN.
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ABSTRACT: The primary goal of a quantitative structure-property relationship (QSPR) is to identify a set of structurally based numerical descriptors that can be mathematically linked to a property of interest. Recently, we proposed some new topological indices (Sh indices) based on the distance sum and connectivity of a molecular graph that derived directly from two-dimensional molecular topology for use in QSAR/QSPR studies. In this study, the ability of these indices to predict the liquid densities (rho) of a large and diverse set of organic liquid compounds (521 compounds) has been examined. Ten different Sh indices were calculated for each molecule. Both linear and non-linear modeling methods were implemented using principal component regression (PCR) and principal component-artificial neural network (PC-ANN) with back-propagation learning algorithm, respectively. Correlation ranking procedure was used to rank the principal components and entered them into the models. PCR analysis of the data showed that the proposed Sh indices could explain about 91.82% of variations in the density data, while the variations explained by the ANN modeling were more than 97.93%. The predictive ability of the models was evaluated using external test set molecules and root mean square errors of prediction of 0.0308 g ml(-1) and 0.0248 g ml(-1) were obtained for liquid densities of external compounds by linear and non-linear models, respectively.Journal of molecular graphics & modelling 10/2008; 27(4):506-11. · 2.17 Impact Factor
Top co-authors
Top Journals
- Electroanalysis (8)
- Talanta (6)
- Analytical Sciences (4)
- The Journal of Organic Chemistry (3)
- Helvetica Chimica Acta (3)
Institutions
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1991–2012
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Shiraz University
- Department of Chemistry
Shīrāz, Fars, Iran
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2000–2010
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Razi University
- Department of Chemistry
Kermānshāh, Ostan-e Kermanshah, Iran
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2009
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Sari Agricultural Sciences and Natural Resources University
Tehrān, Ostan-e Tehran, Iran
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2008
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Shiraz University of Medical Sciences
- Medicinal and Natural Products Chemistry Research Center
Shīrāz, Fars, Iran
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2004
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Urmia University
- Department of Chemistry
Tabrīz, East Azarbaijan, Iran
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2003
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University of Tehran
- School of Chemistry
Tehrān, Ostan-e Tehran, Iran
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