Vol 77, No 4 - Abstracts

JSCS Vol 77, No. 4

Whole issue - PDF 6.099 KB

J. Serb. Chem. Soc. 77 (4) 407–413 (2012)

UDC 546.963’131+547.587.4+547–316:544.4; JSCS–4278; doi: 10.2298/JSC110427189T; Original scientific paper

Synthesis of biscoumarin derivatives by the reaction of aldehydes and 4-hydroxycoumarin using ruthenium(III) chloride hydrate as a versatile homogeneous catalyst

KHALIL TABATABAEIAN, HANNANEH HEIDARI, ALIREZA KHORSHIDI, MANOUCHEHR MAMAGHANI and NOSRAT O. MAHMOODI

Department of Chemistry, Faculty of Sciences, University of Guilan, P. O. Box 41335-1914, Iran

(Received 27 April, revised 6 October 2011)

The one-pot domino Knoevenagel-type condensation/Michael reaction of aromatic, heteroaromatic and aliphatic aldehydes with 4-hydroxycoumarin in aqueous media in the presence of ruthenium salt as homogeneous catalyst was investigated. It was found that 5 mol % of RuCl3·nH2O catalyzes biscoumarin synthesis in high yields (70–95 %) under optimized, mild, green and environmentally benign reaction conditions in short times (25–35min).

Keywords: ruthenium; biscoumarin; aldehyde; 4-hydroxycoumarin; homogeneous catalyst; condensation reaction.

Full Article - PDF 647 KB Supplementary Material PDF 910 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 415–421 (2012)

UDC 547.2–327+547.533+547.368+542.913:66.084.8; JSCS–4279; doi: 10.2298/JSC110511168N; Short communication

SHORT COMMUNICATION

Ultrasound-assisted catalytic synthesis of acyclic imides in the presence of p-toluenesulfonic acid under solvent-free conditions

Masoud Nasr-Esfahani, Morteza Montazerozohori and Najmeh Filvan

Department of Chemistry, Yasouj University, Yasouj, Iran

(Received 11 May, revised 29 June 2011)

A rapid and convenient preparation of acyclic imides by the reaction of aliphatic and aromatic nitriles with acyclic carboxylic anhydride in the presence of catalytic AMounts of p-toluenesulfonic acid under thermal or ultrasonic conditions is reported. The advantages of this procedure are moderate reaction times, good to excellent yields, and use of an inexpensive and eco-friendly catalyst. The reaction of nitriles with aliphatic anhydrides proceeds under thermal conditions, while they are accelerated by the use of ultrasound irradiation.

Keywords: linear carboxylic anhydride; unsymmetrical acyclic imide; nitrile; p-toluenesulfonic acid; ultrasound.

Full Article - PDF 826 KB Available OnLine: 17. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 423–435 (2012)

UDC *Dodonaea viscosa:577.1+66.094.3–92:541.459:615.27/.28:541.515; JSCS–4280; doi: 10.2298/JSC110621183R; Original scientific paper

Phytochemical screening, free radical scavenging, antioxidant activity and phenolic content of Dodonaea viscosa Jacq.

TAUHEEDA RIAZ, MUHAMMAD ATHAR ABBASI, AZIZ-UR-REHMAN, TAYYABA SHAHZADI, MUHAMMAD AJAIB* and KHALID MOHAMMED KHAN**

Department of Chemistry, Government College University, Lahore-54000, Pakistan

*Department of Botany, Government College University, Lahore-54000, Pakistan

**HEJ Research Institute of Chemistry, International Centre for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan

(Received 21 June, revised 9 September 2011)

The purpose of this study was to evaluate the antioxidant potential of Dodonaea viscosa Jacq. A methanolic extract of the plant was dissolved in distilled water and sequentially partitioned with n-hexane, chloroform, ethyl acetate and n-butanol. Phytochemical screening showed the presence of phenolics, flavonoids and cardiac glycosides in large AMounts in the chloroform, ethyl acetate and n-butanol fraction. The antioxidant potential of all these fractions and remaining aqueous fraction was evaluated by four methods: 1,1--diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity, total antioxidant activity, the Ferric reducing antioxidant power (FRAP) assay and ferric thiocyanate assay along with the determination of their total phenolics. The results revealed that the ethyl acetate soluble fraction exhibited the highest percent inhibition of the DPPH radical as compared to the other fractions. It showed 81.14±1.38 % inhibition of the DPPH radical at a concentration of 60 µg ml-1. The concentration of this fraction leading to 50 % inhibition of the DPPH radical (IC50) was found to be 33.95±0.58 µg ml-1, relative to butylated hydroxytoluene (BHT), having an IC50 of 12.54±0.89 µg mL-1. It also showed the highest FRAP value (380.53±0.74 µM of trolox equivalents) as well as the highest total phenolic contents (208.58±1.83 gallic acid equivalent (GAE) mg g-1) and highest value of inhibition of lipid peroxidation (58.11±1.49 % at a concentration of 500 µg ml-1) as compared to the other studied fractions. The chloroform fraction showed the highest total antioxidant activity, i.e., 1.078±0.59 (eq. to BHT).

Keywords: Dodonaea viscosa Jacq.; phytochemical screening; DPPH assay; total antioxidant activity; FRAP value; total phenolics; inhibition of lipid peroxidation.

Full Article - PDF 966 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 437–451 (2012)

UDC *Cephalotaxus oliveri:581.144.9:547.56:547.261:543.544.5.068.7:615.27/.28; JSCS–4281; doi: 10.2298/JSC110801204Z; Original scientific paper

Antioxidant activities and phenolic constituents of Cephalotaxus oliveri Mast. aerial parts

LINGBIN ZENG and L. L. P. VRIJMOED

Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China

(Received 1 August, revised 28 October 2011)

The antioxidant activity and the responsible chemical constituents in Cephalotaxus oliveri Mast. aerial parts were analyzed in the present study. The DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,2’-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid)), reducing power and total phenolic content assays indicated that the methanol extract of the aerial parts was the most potent radical-scavenger and reducing agent and had the highest content of phenolics AMong the tested extracts. The high positive linear correlations implied that the four assays had a similar capacity to predict the antioxidant potential of the aerial parts and that the present phenolic compounds contribute significantly to the DPPH and ABTS radical scavenging activities and to the reducing power of the extracts. The plant also displayed considerable superoxide anion radical scavenging activity. LC–MS/MS and GC–MS analyses resulted in the identification of 22 compounds in the methanol extract, of which 15 were phenolic compounds. The total AMount of the phenolic compounds in the methanol extract determined by the HPLC method was more than 5.62 mg g–1 dry weight. The considerable antioxidant potential and a high content of phenolic antioxidants suggest that C. oliveri aerial parts are a potential source of natural antioxidants.

Keywords: radical scavenging activity; reducing power; total phenolic content; LC–MS/MS; HPLC; GC–MS.

Full Article - PDF 2,514 KB Available OnLine: 1. 12. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 453–463 (2012)

UDC 546.532’742562+547.466.64+547.461.4+54–145.2; JSCS–4282; doi: 10.2298/JSC110201177B; Original scientific paper

Mixed ligand complexes of essential metal ions with L-glutAMine and succinic acid in sodium dodecyl sulfate–water mixtures

GANDHAM HIMA BINDU and GOLLAPALLI NAGESWARA RAO*

Department of Engineering Chemistry, Andhra University, India

*Department of Inorganic and Analytical Chemistry, Andhra University, VisakhapatnAM-530 003, India

(Received 1 February, revised 25 July 2011)

Speciation of mixed ligand complexes of Co(II), Ni(II) and Cu(II) with L-glutAMine and succinic acid was studied in varying AMounts (0.0–2.5 %, w/v) of sodium dodecyl sulfate (SDS) in aqueous solutions while maintaining an ionic strength of 0.16 mol L-1 (NaCl) at 303.0 K. Titrations were performed in the presence of different relative concentrations (M:L:X = 1:2:2, 1:4:2 and 1:2:4) of metal (M) to L-glutAMine (L) to succinic acid (X) using sodium hydroxide. The stability constants of the ternary complexes were refined with Miniquad 75. The best-fit chemical models were selected based on statistical parAMeters and residual analysis. The species detected were ML2X, MLX, MLXH and MLXH2 for Co(II), Ni(II) and Cu(II). The increased stability of the ternary complexes compared to their binary complexes was believed to be due to electrostatic interactions of the side chains of the ligands, charge neutralization, chelate effect, stacking interactions and hydrogen bonding. The species distribution with pH at different compositions of SDS and plausible equilibria for the formation of the species are also presented.

Keywords: speciation; mixed ligand complexes; L-glutAMine; succinic acid; SDS.

Full Article - PDF 1,030 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 465–481 (2012)

UDC 677.027.233+677.027.562.6+667.281+546.215:54–76; JSCS–4283; doi: 10.2298/JSC110216187M; Original scientific paper

Decolorization of the textile azo dye Reactive Orange 16 by the UV/H₂O₂ process

JELENA MITROVIĆ, MILJANA RADOVIĆ, DANIJELA BOJIĆ, TATJANA ANĐELKOVIĆ, MILOVAN PURENOVIĆ and ALEKSANDAR BOJIĆ

Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18 000 Niš, Serbia

(Received 16 February, revised 3 August 2011)

The photochemical decolorization of C.I. Reactive Orange 16 (RO16), a reactive textile azo dye, by the UV/H2O2 process was studied using a batch photoreactor with UV lAMps emitting at 253.7 nm. Complete decolorization of 50.0 mg dm-3 initial dye concentration was achieved in less than 6 min under optimal conditions (25 mM initial peroxide concentration, at pH 7.0 and with a UV light intensity of 1950 μW cm-2). The effects of experimental variables, such as initial pH, initial concentration of H2O2, initial dye concentration, and the intensity of UV light were studied. The highest decolorization rates were realized at a peroxide concentration in range from 20 to 40 mM, above which decolorization was inhibited by the scavenging effect of the peroxide. The decolorization was more efficient in neutral pH values. The efficiency of the process was improved with lower initial dye concentrations and at higher intensities of UV light.

Keywords: Reactive Orange 16; UV/H2O2 process; decolorization.

Full Article - PDF 1,257 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 483–496 (2012)

UDC 547.495.1+541.135.5–039.6:543.632.514:543.544.5.068.7:544.6; JSCS–4284; doi: 10.2298/JSC110420188L Original scientific paper

Electrochemical behavior and electrochemical determination of carbAMazepine at an ionic liquid modified carbon paste electrode in the presence of sodium dodecyl sulfate

LI-HONG LIU*,**, CHENG-QIAN DUAN*,***and ZUO-NING GAO*

*key Lab of Energy Sources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China

**Department of Chemistry, Heihe College, Heihe 164300, China

***Higher Vocational College, Ningxia Medical University, Yinchuan 750004, China

(Received 20 April, revised 9 October 2011)

The electrochemical behavior and electrochemical determination of carbAMazepine (CBZ) at a hydrophobic ionic liquid 1-benzyl-3-methylimidazole hexafluorophosphate ([BnMIM]PF6) modified carbon paste electrode ([BnMIM]PF6/CPE) in the presence of sodium dodecyl sulfate (SDS) were investigated. A well-defined and sensitive oxidation peak was observed at the [BnMIM]PF6/CPE in the presence of SDS and a 0.10 M phosphate buffer solution (pH 6.80). The oxidation peak current of CBZ increased significantly at the [BnMIM]PF6/CPE in the presence of SDS compared with that in the absence of SDS at the carbon paste electrode. It suggested that both SDS and [BnMIM]PF6/CPE show an obvious enhancing effect on the electrochemical oxidation of CBZ. The electrochemical kinetic parAMeters for CBZ at the [BnMIM]PF6/CPE in aqueous SDS solutions were also determined by chronocoulometry and chronoAMperometry. Finally, the experimental conditions were optimized, and a new electrochemical method for the determination for CBZ was established. The oxidation peak current was linearly dependent on the CBZ concentration in the range 7.0 μM to 0.7 mM, with a detection limit of 0.98 μM (signal to noise ratio, S/N = 3). The relative standard deviation for six determinations of 0.10 mM CBZ was between 1.40 and 2.13 %. The proposed method was applied in the determination of CBZ in commercial tablet sAMples.

Keywords: carbAMazepine; sodium dodecyl sulfate; ionic liquid modified carbon paste electrode; electrochemistry.

Full Article - PDF 1,449 KB Available OnLine: 22. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 497–505 (2012)

UDC 669.112.28+669.24’5+542.913:66.081.2–914:66.017; JSCS–4285; doi: 10.2298/JSC110302186J Original scientific paper

Mechano–chemical synthesis of stoichiometric nickel and nickel–zinc ferrite powders with Nicolson–Ross analysis
of the absorption coefficients

ČEDOMIR JOVALEKIĆ, ALEKSANDAR S. NIKOLIĆ*, MAJA GRUDEN-PAVLOVIĆ* and MIODRAG B. PAVLOVIĆ**

Institute for Multidisciplinary Research, Kneza Višeslava 1a, 11001 Belgrade, Serbia

*Faculty of Chemistry, Studentski trg 12–16, 11001 Belgrade, Serbia and

**Faculty of Electrical Engineering, B. Kralja Aleksandra 73, 11001 Belgrade, Serbia

(Received 2 March, revised 6 May 2000011)

The interest in finding new methods for the preparation of nickel ferrite (NiFe2O4) and nickel–zinc ferrite (NixZn1-xFe2O4) powders has recently increased, because the physical and chemical properties of these soft magnetic materials depend strongly on the preparation conditions. In this study, powder sAMples of ferrites were obtained by: 1) a classic sintering procedure (NixZn1-xFe2O4, x = 0.9) and 2) planetary mill synthesis (both NiFe2O4 and the NixZn1-xFe2O4). The mechano-chemical reaction leading to the formation of the spinel phase of NixZn1-xFe2O4 (x = 1 or 0.9) was monitored by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) analysis. The values of the real and imaginary parts of the permittivity and permeability were measured for the obtained nickel and nickel–zinc ferrite sAMples in the 7–12 GHz frequency range. Based on the obtained results, the EMR absorption coefficients were calculated for all three types of sAMple. It was concluded that the method of preparation and the final particle size influence the EMR absorption coefficient of nickel and nickel–zinc ferrites.

Keywords: ferrites; nanocrystalline materials; mechano-chemistry; radar absorbers

Full Article - PDF 1,827 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 507–521 (2012)

UDC 547.461.3:532.14:547–316:539.196; JSCS–4286; doi: 10.2298/JSC110712198R Original scientific paper

Volumetric, viscometric and optical study of molecular interactions in binary mixtures of diethyl malonate with ketones at 303.15, 308.15 and 313.15 K

MANAPRAGADA V. RATHNAM, SUDHIR MOHITE and MANAPRAGADA S. KUMAR*

Physical Chemistry Research Laboratory, B. N. Bandodkar College of Science, Thane – 400 601, India

*Department of Chemistry, Zulal Bhilajirao Patil College, Deopur, Dhule – 424 002, India

(Received 12 July, revised 22 September 2011)

Density, r, viscosity, h, and refractive index, nD, were measured for binary mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone, cyclohexanone and 3-pentanone) at temperatures of 303.15, 308.15 and 313.15 K over the entire composition range. The excess volume, VE, deviation in viscosity, Δh, excess Gibb’s free energy of activation for viscous flow, ΔGE, and deviation in molar refraction, ΔR, were determined from the experimental data and the computed results were fitted to the Redlich–Kister polynomial equation. The values of VE, Δh, ΔGE, and ΔR were plotted against the mole fraction of diethyl malonate. The observed positive and negative values of the excess parAMeters for all the studied binary mixtures were explained based on the intermolecular interactions present in these mixtures. Furthermore, different empirical relations were used to correlate the binary mixture viscosities and refractive indices.

Keywords: density; diethyl malonate; ketones; molecular interactions; excess properties.

Full Article - PDF 1,349 KB Supplementary Material PDF 922 KB Available OnLine: 25. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 523–533 (2012)

UDC 66.047+532.72:519.87+519.68; JSCS–4287; doi: 10.2298/JSC110717191V; Original scientific paper

Calculation of the effective diffusion coefficient during the drying of clay sAMples

MILOŠ VASIĆ, ZAGORKA RADOJEVIĆ and ŽELJKO GRBAVČIĆ*

Institute for the Testing of Materials, Bulevar Vojvode Mišića 43, 11000 Belgrade, Serbia

*Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia

(Received 17 July, revised 10 October 2011)

The aim of this study was to calculate the effective diffusion coefficient based on experimentally recorded drying curves for two masonry clays obtained from different localities. The calculation method and two computer progrAMs based on the mathematical calculation of the Second Fick Law and the Cranck Diffusion Equation were developed. Masonry product shrinkage during drying was taken into consideration for the first time and the appropriate correction was entered into the calculation. The results presented in this paper show that the values of the effective diffusion coefficient determined by the designed computer progrAMs (with and without the correction for shrinkage) have similar values to those available in the literature for the sAMe coefficient for different clays. Based on the mathematically determined prognostic value of the effective diffusion coefficient, it was concluded that, whatever the initial mineralogical composition of the clay, there is 90 % agreement of the calculated prognostic drying curves with the experimentally recorded ones. When a shrinkage correction of the masonry products is introduced into the calculation step, this agreement is even better.

Keywords: diffusion; drying; mathematical modeling; computer progrAM.

Full Article - PDF 1,069 KB Available OnLine: 22. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 535–548 (2012)

UDC 677.027.233+667.287+546–38:537.226.3; JSCS–4288; doi: 10.2298/JSC110629179D; Original scientific paper

Decolorization of Reactive Black 5 using a dielectric barrier discharge in the presence of inorganic salts

BILJANA P. DOJČINOVIĆ, GORAN M. ROGLIĆ*, BRATISLAV M. OBRADOVIĆ**, MILORAD M. KURAICA**, TOMISLAV B. TOSTI*, MARIJANA D. MARKOVIĆ* and DRAGAN D. MANOJLOVIĆ*

Institute of Chemistry, Technology and Metallurgy, Center of Chemistry, Studentski trg 12–16, 11000 Belgrade, Serbia

*Faculty of Chemistry, University of Belgrade, P. O. Box 51, 11058 Belgrade, Serbia

**Faculty of Physics, University of Belgrade, P. O. Box 368, 11000 Belgrade, Serbia

(Received 29 June, revised 1 August 2011)

Inorganic salts improve the coloration of textiles, which increases the pollution load of dye-house effluent in general. Decolorization of the reactive textile dye C.I. Reactive Black 5 was studied using Advanced Oxidation Processes (AOPs) in a non-thermal plasma reactor, based on the coaxial water falling film Dielectric Barrier Discharge (DBD). The initial dye concentration in the solution was 40.0 mg L-1. The effects of the addition of different high concentrations of inorganic salt (NaCl, Na2SO4 and Na2CO3) on the degree of decolorization were studied. The dye solution was recirculated through the DBD reactor with an applied energy density of 45.0–315 kJ L-1. The influence of residence time was investigated after 5 min and 24 h of plasma treatment. Decolorization of the dye was monitored spectrophotometrically. The pH value and the conductivity of the dye solution were measured after each recirculation. The most effective decolorization of over 90 % was obtained with the addition of NaCl (50 g L-1) with an applied energy density of 135 kJ L-1 and after a residence time of 24 h of plasma treatment. Decolorization of the solutions containing inorganic salts Na2SO4 and Na2CO3 were lower than for the solution without salt.

Keywords: decolorization; Reactive Black 5; inorganic salt; plasma treatment; dielectric barrier discharge; DBD reactor.

Full Article - PDF 1,515 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 549–561 (2012)

UDC 546.48+66.081.000.57:664.642+54–145.2; JSCS–4289; doi: 10.2298/JSC110520181T; Original scientific paper

Cadmium biosorption by baker’s yeast in aqueous suspensions

KATALIN TÁLOS, TÍMEA PERNYESZI, CORNELIA MAJDIK*, ALZBETA HEGEDŰSOVA** and CSILLA PÁGER

University of Pécs, Faculty of Science, Department of Analytical and Environmental Chemistry, 6 Ifjúság, H-7624 Pécs, Hungary

*University Babeş-Bolyai, Faculty of Chemistry and Chemical Engineering, 11 Arany J., RO-400293 Cluj-Napoca, Romania

**Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University, Tr. A. Hlinku 1, SK-949 01, Nitra, Slovakia

(Received 20 May, revised 30 August 2011)

Abstract: The biosorption of cadmium from artificial aqueous solutions using native baker’s yeast was investigated. The highest metal uptake value was 110 mg g-1 yeast in a suspension of 0.30 g L-1. The effect of pH, initial cadmium concentration, adsorption time and biosorbent dosage on biosorption by baker’s yeast was studied. The maximum biosorption capacity of yeast for cadmium was observed at pH 6.0. The adsorption equilibrium was reached within sixty minutes and the sorption process followed pseudo second-order kinetics. Cadmium biosorption isotherms were determined in the cadmium concentration range of 10–500 mg L-1 at pH 6 in a suspension of 0.30 g L-1. For evaluation of biosorption equilibrium, Langmuir and Freundlich equations were applied to the experimental data.

Keywords: cadmium; baker’s yeast; biosorption; pH; kinetics; isotherm; biosorbent dosage.

Full Article - PDF 984 KB Available OnLine: 21. 11. 2011. Cited by

J. Serb. Chem. Soc. 77 (4) 563–567 (2012)

UDC 543+061.3(4); EuCheMS news

EUCHEMS NEWS

European Analytical Column No. 40
Analytical chemistry in Europe – education, research, publications and conferences

JIRI BAREK, REINER SALZER*, PAUL WORSFOLD** and JENS E. T. ANDERSEN***

Charles University in Prague, Faculty of Science, Department of Analytical Chemistry, Albertov 6, CZ 128 43 Prague 2, Czech Republic

*Dresden University of Technology, Department of Chemistry and Food Chemistry, D 01062 Dresden, Germany

**School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK

Department of Chemistry, Technical University of Denmark, Building 207, 2800 Lyngby, Denmark

Full Article - PDF 625 KB

Society Home Page

Journal Home Page