M. Chamsaz

Ferdowsi University Of Mashhad, Mashad, Razavi Khorasan, Iran

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Publications (49)78.59 Total impact

  • S. Tarahomi · G. H. Rounaghi · M. Chamsaz
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    ABSTRACT: In this study, a competitive transport procedure was used for transport process of Cr(III), Cu(II), Co(II), Cd(II), Ag(I), Pb(II), and Zn(II) metal cations across bulk liquid membrane (BLM) using phenylaza- 15-crown-5 and cryptand 222 as carriers and dichloromethane (DCM), chloroform (CHCl3), nitrobenzene (NB), 1,2-dichloroethane (1,2-DCE) and CHCl3-NB, DCM-1,2-DCE binary solvent solutions as extracting solvents. Atomic absorption spectrometry was used for determination of the concentration of the studied metal cations in source and receiving phases. The experimental results show that maximum transport rate is for silver(I) cation in the presence of the other metal cations using phenylaza-15-crown-5 as carrier and no transport was observed for the seven metal cations by cryptand 222 in all membrane systems. The effect of various parameters on the transport process was investigated. The effect of solvent on the transport efficiency of silver(I) cation was found to be in the order: NB > DCM > 1,2- DCE > CHCl3. The results also showed that the transport process of silver(I) cation through CHCl3-NB and DCM-1,2-DCE bulk liquid membranes is sensitive to the solvent composition. A non-linear relationship was observed between the transport rate of silver(I) ion and the composition of these binary mixed solvents. The influence of some fatty acids as surfactant in the membrane phase on the transport of the metal cations was also investigated.
    No preview · Article · Jul 2015 · Russian Journal of Applied Chemistry
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    ABSTRACT: This paper proposes the possibility of applying first order calibration methods for unknown sample(s) with unmodeled component(s) using the differential spectra obtained from subtracting of the absorbance spectra of sample that are recorded in two different environments. The main interest is that the method can be performed to quantify systems if the spectra of their unmodeled component(s) are the same in two different phases using first order calibration methods. The procedure demonstrates simultaneous determination of new fuchsine, crystal violet and malachite green in the presence of sunset yellow, tartarazine and amaranth as unmodeled interferences, whose spectra differ in aqueous and nonionic micellar solution of Triton X-100. The obtained satisfactory results indicate the successful applicability of the proposed method in complex samples.
    Full-text · Article · Jan 2015 · Journal of Analytical Chemistry
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    Mahboobeh Vafi · Gholam Hossein Rounaghi · Mahmood Chamsaz
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    ABSTRACT: The complextion reaction between Y3+ cation with macrocyclic ligand, 4′-nitrobenzo-18-crown-6 (4′NB18C6), was studied in acetonitrile-methanol (AN-MeOH), acetonitrile-1,2-dichloroethane (AN-DCE), acetonitrile-dimethylformamide (AN-DMF) and acetonitrile- ethylacetate (AN-EtOAc) binary mixed solvent solutions at different temperatures using the conductometric method. The conductance data show that in most cases, the stoichiometry of complex formed between 4′NB18C6 and Y3+ cation is 1:1 [M:L], but in the case of AN-DCE binary solution (mol%DCE=50) at 15, 25 and 35°C, a 2:1 [M2:L] and also a 2:2 [M2:L2] complexes are formed in solution.The results show that the stoichiometry of the complex formed between 4′NB18C6 and Y3+ cation changes with the composition of the mixed solvents and even with temperature. The stability constant of the 1:1 complex was determined using a computer program, GENPLOT. The stability order of (4′NB18C6.Y)3+ complex in pure studied solvents at 25°C was found to be: EtOAc > AN > MeOH > DMF and in the case of the mixed solvent solutions with 25 mole percent of AN at 25°C was: AN-DCE > AN-EtOAc > AN-MeOH ∼ AN-DMF. The values of stability constant (logKf) of (4′NB18C6.Y)3+ complex which was obtained from conductometric data, show that the stability of the complex is not only affected by the nature and composition of the solvent system, but it is also influenced by the temperature. In all cases, a non-linear behavior is observed for changes of logKf of the (4′NB18C6.Y)3+ complex versus the composition of the binary mixed solvents. The values of standard thermodynamic quantities (ΔH°c and ΔS°c) for the complexation process which were obtaind from temperature dependence of the stability constant of (4′NB18C6.Y)3+ complex, show that depending on the solvent system, in most cases, the complex is enthalpy and also entropy stabilized, but in some cases, it is estabilized or destabilized from these view points.
    Full-text · Article · Aug 2014 · Arabian Journal of Chemistry
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    ABSTRACT: A dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFOD) was developed for preconcentration and determination of indium in real samples. In this method, an appropriate mixture of acetone (as disperser solvent) and 1-undecanol (as extracting solvent) containing dithizone (as chelating agent) was rapidly injected into the aqueous samples of indium. In this step, the cloudy solution was formed and the complexes of In-dithizone was extracted into 1-undecanol. After the phase separation, the absorbance of the extracted indium was measured at 510 nm. Under the optimum condition, the calibration graph was linear in the range of 30-230 mu g L-1 with detection limit of 9 mu g L-1. The relative standard deviation (RSD, n = 6) was 1.04 %. The developed method was successfully applied to extract and determine indium in real samples.
    No preview · Article · Jun 2014 · Russian Journal of Applied Chemistry
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    ABSTRACT: A new, simple and highly sensitive dispersive liquid-liquid microextraction method using an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]), for silver determination at trace levels was developed by flame atomic absorption spectrometry in water samples. Diethyl dithiocarbamate (DDTC) was employed as a chelating agent to form Ag-DDTC complex for extracting silver ions from aqueous solution into the fine droplets of [C4MIM][PF6]. Some effective factors influencing the microextraction efficiency include the pH, the diethyl dithiocarbamate concentration, type and volume of disperser solvent, the amount of ionic liquid, the ionic strength and the centrifugation time were investigated and optimized. At the optimum experimental conditions, the limit of detection based on 3Sbwas 3.0 μg L-1. The relative standard deviation for five replicate determinations of 200 μg L-1 Ag was 2.9 %. The calibration graph was linear in the range of 15-300 μg L-1 with a correlation coefficient of 0.9961. The applicability of the proposed method was evaluated by determination of trace amounts of silver in water samples.
    No preview · Article · Jul 2013 · Asian Journal of Chemistry
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    ABSTRACT: A new flow injection method coupled to an electrochemical hydride generator with atomic absorption spectrometry was proposed for determination of cadmium. The influence of the experimental parameters such as cathode material, catholyte type, sample volume, catholyte flow rate, temperature of the atomizer, catholyte concentration, carrier gas flow rate, electrolytic current and cathode surface area on the analytical response was studied. Under the optimized conditions, the calibration curve was linear in the range of 2–50 ng mL− 1 of Cd. A concentration detection limit (3σb, n = 9) of 0.61 ng mL− 1 Cd and a relative standard deviation of 5.1% (RSD, n = 9) for 20 ng mL− 1 Cd were obtained. The potential interferences from various ions were also evaluated. The accuracy of the method was verified by the determination of cadmium in a certified reference material. The calculated concentration of Cd in CRM was found to be in good agreement with the certified value.
    No preview · Article · May 2013 · Microchemical Journal
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    ABSTRACT: Headspace single-drop microextraction (HS-SDME) coupled with gas chromatography with electron capture detection (GC-ECD) was used for quantification of total iodine in milk based samples of infant formula. In this procedure 3 μL of a mixture containing 1-octanol and 3-pentanone was exposed to the headspace of a 5 mL acidic (H2SO4, 2 mol L−1) aqueous solution containing 1.5 mol L−1 ZnSO4 for 30 minutes followed by addition of 1 mL of 1 mol L−1 H2O2 for in situ generation of iodine. Optimization of the microextraction system was carried out using the Taguchi experimental design method. The limit of detection was determined to be 250 ng L−1 with an enrichment factor of 150. The repeatability, expressed as a relative standard deviation, was 1.9% (n = 6). The linear calibration working range was between 0.75 and 2000 μg L−1 (r2 = 0.998). The method was successfully applied for determination of iodine in milk based samples of infant formula.
    No preview · Article · Jan 2013 · Analytical methods
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    ABSTRACT: A novel electrochemical hydride generation (ECHG) system working in flow-injection (FI) mode was developed for determination of cadmium coupled to an electrically heated quartz tube atomizer (QTA) by atomic absorption spectrometry (AAS). A Plackett-Burman experimental design for screening has been used to evaluate the influence of several variables on the analytical response. Then, the significant parameters such as the concentration of NaCl in catholyte, applied electrolytic current and flow rate of carrier gas have been simultaneously optimized using a central composite design (CCD). Under the optimized conditions, the detection limit (3σ(b), n=9) was found to be 0.51 ng mL(-1) Cd and the relative standard deviation (RSD) for nine replicate analyses of 20 ng mL(-1) Cd was 6.5%. The calibration curve was linear in the range of 2-50 ng mL(-1) of Cd. The potential interferences from various ions were also evaluated. The analysis of a reference material showed good agreement with the certified value. The proposed method was successfully applied to the determination of Cd in tap water sample.
    No preview · Article · Aug 2012 · Talanta
  • S. Asadpour · M. Chamsaz · M.H. Entezari · M.J. Haron · N. Ghows
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    ABSTRACT: Titanium dioxide (TiO2) nanoparticles were prepared by Sonochemical synthesis method at low intensity and characterized using X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The preconcentration capability of TiO2 nanoparticles for As(V) was assessed in this work using column method from aqueous solution prior to their determination by graphite furnace atomic absorption spectrometry(GFAAS). The optimum experimental parameters for preconcentration of As(v), such as pH, volume and flow rate of sample solution, eluent and interfering ions, have been investigated. The adsorption capacity of TiO2 nanoparticles for As(v) was found to be 32.25 mg g-1. Also the method detection limit, precision (R.S.D., n=8) and enrichment factor for As(v)were 72 ng L-1, 5.3 % and 83, respectively. The method has been applied for the determination of trace element in some environmental water samples with satisfactory results.
    No preview · Article · Jul 2012 · Research Journal of Pharmaceutical, Biological and Chemical Sciences
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    ABSTRACT: A new method has been developed for the determination of Tl(I) based on simultaneous sorption and preconcentration with a microcolumn packed with TiO2 nanoparticle with a high specific surface area prepared by Sonochemical synthesis prior to its determination by graphite furnace atomic absorption spectrometry (GFAAS). The optimum experimental parameters for preconcentration of thallium, such as elution condition, pH, and sample volume and flow rate have been investigated. Tl(I) can be quantitatively retained by TiO2 nanoparticles at pH 9.0, then eluted completely with 1.0 mol L−1 HCl. The adsorption capacity of TiO2 nanoparticles for Tl(I) was found to be 25 mg g−1. Also detection limit, precision (RSD, n = 8) and enrichment factor for Tl(I) were 87 ng L−1, 6.4% and 100, respectively. The method has been applied for the determination of trace amounts of Tl(I) in some environmental water samples with satisfactory results.
    Preview · Article · May 2012 · Arabian Journal of Chemistry
  • S. Asadpour · M. Chamsaz · M.J. Haron
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    ABSTRACT: Quantitative structure-retention relationship (QSRR) models correlating the retention times of diverse chlorinated pesticides, herbicides, and organohalides in gas chromatography/electron capture detector (GC/ECD) system and their structures were developed based on different multivariate regression techniques by using molecular structural descriptors.Modeling of retention times of these compounds as a function of the theoretically derived descriptors was established by multiple linear regression (MLR), partial least squares (PLS) regression and Artificial Neural Networkwith batch back propagation algorithm (BBP-ANN).The stepwise regression using SPSS was used for the selection of the variables that resulted in the best-fitted models. The aim of this paper was to compare the performances of different linear and nonlinear multivariate calibration techniques. The predictive quality of the QSRR models were tested for an external prediction set of 12 compounds randomly chosen from 38 compounds. The best model obtained from the training set based onhighest external predictive R2 value and lowest RMSEP value also showed good internal predictive power. The ANN method with Batch Back Propagation (BBP) algorithm was used to model the structure-retention relationships, more accurately. The squared regression coefficients of prediction for the MLR, PLS and ANN models were 0.951, 0.948 and 0.968, respectively.
    No preview · Article · Apr 2012 · Research Journal of Pharmaceutical, Biological and Chemical Sciences
  • M. Chamsaz · M.M. Riazi
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    ABSTRACT: In this investigation a novel and extremely sensitive method for separation and determination of silver in aqueous samples by ionexchange resin combined with electrothermal atomic absorption spectrometry is described. In this method 100 mL of Ag + in pH 4.5 at room temperature is separated with Chelex-100 ion-exchange resin. After separation, the resin is washed by a solution inclusive of 0.5 M HNO 3 concurrent with 0.4 % (w/v) thiourea and 20 μL of washing solution is directly transferred into a graphite tube together with coinjection of 20 μL Cu 2+ 0.2 % (w/v) as matrix modifier. In this investigation the type of washing solution, concentration of washing solution, pH of sample solution, concentration of thiourea, rate of sample solution and ionic strength were optimized. Using 100 mL sample solution, an enrichment factor of 10 was obtained. The detection limit was calculated to be 0.2 ng mL -1 based on 3Sb and relative standard deviation for five replicate analysis of 1.00 ng mL -1Ag + was 5.1 %. The calibration curve was linear in the range of 0.2 ng mL -1 to 3.0 ng mL -1 with a sensitivity of 20.0 pg mL -1. This method was used for determination of silver in tap water, waste water, sea water and soil sample.
    No preview · Article · Mar 2012 · Asian Journal of Chemistry
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    ABSTRACT: A pre-concentration and determination methodology for mercury at trace levels in water samples was developed. Cloud point extraction was successfully employed for pre-concentration of mercury prior to electrothermal atomic absorption spectrometry (ETAAS) using Triton-X-100 as surfactant. In this study the effect of different modifiers on mercury determination were also investigated. Under the optimum conditions,the limit of detection (LOD) was 1.2 μg L -1. RSD for 10 replicate determinations of 10 μg L -1 Hg was 4.7 %. The calibration graph was linear in the range of 10-100 μg L -1with a correlation coefficient of 0.997. The method was successfully applied to determine mercury in sea water samples.
    No preview · Article · Jan 2012
  • J. Fadaee · M. Chamsaz · A. Safavi · H.A. Zamani
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    ABSTRACT: In present work, rank annihilation factor analysis was used to determine the formation constants of complexes between 3,6-bis[(2- arsonophenyl)azo]-4,5- dihydroxy-2,7-naphthalenedisulphonic acid disodium salt Arsenazo(III) and 13 lanthanides. The applicability of rank annihilation factor analysis for resolving the three competitive complex formation equilibria with large spectral overlapping of the three complex species was shown by comparison of the results with those obtained with the hard- and soft-modeling methods, which show satisfactory agreement between the results. The results showed that all the 13 lanthanides (M) studied form similar type of complexes and spectral profiles with Arsenazo (III) (L). For each of them, the three formation constants correspond, respectively, to M to L ratios of 1:1, 1:2 and 2:2.
    No preview · Article · Jan 2012
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    ABSTRACT: The objective of this study was to compare the performance of an artificial neural network (ANN) model and a 3-phase segmented linear regression model to describe the relationship between flock age and hatchability in broiler breeder flocks. The predictive quality of these models was tested for an external validation set of 14 wk, randomly chosen from 39 wk. The accuracy of the models was determined by the r2 value, mean square error, bias, and Theil’s U-statistic parameters. The r2 values of the 3-phase segmented linear regression and ANN models were 0.4003 and 0.9984, respectively. Therefore, the ANN produced more accurate predictions of hatchability than the 3-phase segmented linear regression model. We conclude, based on the results of this study in commercial broiler breeder flocks, that hatchability is a function of flock age and that the relationship can be described by an ANN model.
    No preview · Article · Aug 2011 · The Journal of Applied Poultry Research
  • Gholam Hossein Rounaghi · Arezoo Ghaemi · Mahmood Chamsaz
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    ABSTRACT: A series of competitive metal ion transport experiments have been performed. Each involved transport from an aqueous source phase across an organic membrane phase into an aqueous receiving phase. The source phase consisted of a buffer solution (CH3COOH/CH3COONa) at pH = 5 and containing an equimolar mixture of Co2+, Fe3+, Cd2+, Cu2+, Zn2+, Ag+ and Pb 2+ metal cations. The organic phase contained the macrocyclic ligand, 1,10-dodecyl-1,10-diaza-18-crown-6 (Kryptofix 22DD) as an ionophore and the receiving phase consisted of a buffer solution (HCOOH/HCOONa) at pH = 3. The results show that the ionophore is selective for silver cation. The effects of various organic solvents on cation transport rates have been demonstrated. Among the organic solvents involving nitrobenzene (NB), chloroform (CHCl 3), dichloromethane (DCM), 1,2-dichloroethane (1,2-DCE), chloroform-nitrobenzene (CHCl3-NB) and chloroform-dichloromethane (CHCl3- DCM) binary systems which were used as liquid membrane, a good transport efficiency and selectivity was obtained for Ag+ cation. The sequence of transport rate for Ag+ cation in the pure organic solvents was found to be: DCM > CHCl3 > NB > 1,2-DCE. The non-linear behaviour was observed for variations of the transport rate of silver cation versus the composition of chloroform-nitrobenzene and chloroform-dichloromethane binary mixtures was discussed in terms of changing the chemical and physical properties of the constituents solvents when they mix with one another. The influence of fatty acids as surfactant in the membrane phase on the transport of metal cations was also investigated.
    No preview · Article · Jul 2011 · Asian Journal of Chemistry
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    ABSTRACT: A novel and extremely sensitive method for extn. and detn. of bismuth in aq. samples by liq. phase micro extn. (LPME) combined with electrothermal at. absorption spectrometry using a new ligand is described. In this method Bi3+ in pH 6 during 20 min extn. time at 20° is reacted with S-methyl-3-salicylidene dithiocarbazate dissolved in 4 μL of chloroform microdrop. After extn., the microdrop was retracted and directly transferred into a graphite tube coated by palladium and tungsten with co-injection of tartaric acid as chem. modifier. The type of org. solvent, vol. of org. solvent, pH, temp., and extn. time were optimized. Using 10 mL sample soln. an enrichment factor of 100 was obtained. The detection limit was calcd. to be 19 pg mL-1 based on 3Sb and RSD for 5 replicate anal. of 0.5 ng mL-1 Bi3+ was 4.8 %. The calibration curve was linear in the range of 19 pg mL-1 to 2.4 ng mL-1 with a sensitivity of 4.0 pg mL-1. This method was used for detn. of bismuth in tap water, wastewater, seawater, soil and reliability of the method was evaluated using two ref. materials. [on SciFinder(R)]
    No preview · Article · Jun 2011 · Asian Journal of Chemistry
  • Gholam Hossein Rounaghi · Arezoo Ghaemi · Mahmood Chamsaz
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    ABSTRACT: Competitive permeation of seven metal cations from an aqueous source phase containing equimolar concentrations of Co2+, Fe3+, Cd2+, Cu2+, Zn2+, Ag+ and Pb2+ metal ions at pH 5 into an aqueous receiving phase at pH 3 through an organic phase facilitated by 1,13-bis(8-quinolyl)-1,4,7,10,13-pentaoxatridecane (Kryptofix5) as a carrier was studied as bulk liquid membrane transport. The obtained results show that the carrier is highly selective for Ag+ cation and under the employed experimental conditions, it transports only this metal cation among the seven studied metal cations. The effects of various organic solvents on cation transport rates have been demonstrated. Among the organic solvents involving nitrobenzene (NB), chloroform (CHCl3), dichloromethane (DCM) and 1,2-dichloroethane (1,2-DCE) which were used as liquid membrane, the most transport rate was obtained for silver (I) cation in DCM. The sequence of transport rate for this cation in organic solvents was: DCM > CHCl3 > 1,2-DCE > NB. The competitive transport of these seven metal cations was also studied in CHCl3–NB and CHCl3–DCM binary solvents as membrane phase. The results show that the transport rate of Ag+ cation is sensitive to the solvent composition and a non-linear relationship was observed between the transport rate of Ag+ and the composition of these binary mixed non-aqueous solvents. The influence of the stearic acid, palmitic acid and oleic acid as surfactant in the membrane phase on the transport of the metal cations was also investigated.
    No preview · Article · Jun 2011 · Arabian Journal of Chemistry
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    ABSTRACT: A novel and extremely sensitive method for extn. and detn. of cadmium in aq. samples by liq. phase micro extn. combined with electrothermal at. absorption spectrometry using a new ligand is described. In this method Cd2+ in pH 4 during 20 min extn. time at 20° is reacted with S-methyl-3-salicylidene dithiocarbazate dissolved in 4 μL of chloroform micro drop. After extn., the micro drop was retracted and directly transferred into a graphite tube coated by palladium as chem. modifier. The type of org. solvent, vol. of org. solvent, pH, temp. and extn. time were optimized. Using 10 mL sample soln. an enrichment factor of 100 was obtained. The detection limit is 6 pg mL-1 based on 3Sb and relative std. deviation for five replicate anal. of 0.2 ng mL-1 Cd2+ was 4.9%. The calibration curve was linear in the range of 6 pg mL-1 to 1.0 ng mL-1 with a sensitivity of 1.0 pg mL-1. This method was used for detn. of cadmium in tap water, waste water, sea water, soil and reliability of the method was evaluated using two ref. materials. [on SciFinder(R)]
    No preview · Article · Feb 2011 · Asian Journal of Chemistry
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    ABSTRACT: A novel and extremely sensitive method for extn. and detn. of cadmium in aq. samples by liq. phase micro extn. combined with electrothermal at. absorption spectrometry using a new ligand is described. In this method Cd2+ in pH 4 during 20 min extn. time at 20° is reacted with S-methyl-3-salicylidene dithiocarbazate dissolved in 4 μL of chloroform micro drop. After extn., the micro drop was retracted and directly transferred into a graphite tube coated by palladium as chem. modifier. The type of org. solvent, vol. of org. solvent, pH, temp. and extn. time were optimized. Using 10 mL sample soln. an enrichment factor of 100 was obtained. The detection limit is 6 pg mL-1 based on 3Sb and relative std. deviation for five replicate anal. of 0.2 ng mL-1 Cd2+ was 4.9%. The calibration curve was linear in the range of 6 pg mL-1 to 1.0 ng mL-1 with a sensitivity of 1.0 pg mL-1. This method was used for detn. of cadmium in tap water, waste water, sea water, soil and reliability of the method was evaluated using two ref. materials. [on SciFinder(R)]
    No preview · Article · Jan 2011 · Asian Journal of Chemistry