Vol 79, No 7 - Abstracts

JSCS Vol 79, No 7

$Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: D:\HTTPD\1_SHD-WEB\JSCS\Vol72\edition_ani.gif$

Whole issue - PDF 3,428 KB

J. Serb. Chem. Soc. 79 (7) 759–765 (2014)

UDC 537–962:547.391.1+547.551.43+547.828:57–188; JSCS–4624; doi: 10.2298/JSC130718145M; Original scientific paper

A microwave approach to the synthesis of certain 4-(substituted phenyl)-6-phenyl-3-cyano-2-pyridones

ALEKSANDAR MARINKOVIĆ, DUŠAN MIJIN, JELENA MIRKOVIĆ, VESELIN MASLAK* and C. OLIVER KAPPE**

Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia

*Faculty of Chemistry, University of Belgrade, Studentski trg 12–16, 11000 Belgrade, Serbia

**Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstraße 28,A-8010 Graz, Austria

(Received 18 July, accepted 27 November 2013)

A study of the synthesis of 4-(substituted phenyl)-6-phenyl-3-cyano-2-pyridones from ethyl 2-cyano-3-(substituted phenyl) acrylates and acetophenone is presented. The 2-pyridones were obtained using conventional as well as microwave synthesis under solvent and solvent-free conditions in domestic and laboratory microwave ovens. The structure of the obtained pyridones was confirmed by m.p., FT-IR, NMR and UV data.

Keywords: pyridone; acrylate; cyclocondensation reaction; microwave chemistry.

Full Article - PDF 183 KB Supplementary Material PDF 102 KB Available OnLine: 18. 11. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 767–778 (2014)

UDC 537–962+542.913:547.814.5+547.556.9:615.28–188; JSCS–4625; doi: 10.2298/JSC131015002J; Original scientific paper

Substituted proline derivatives as organocatalysts in the Michael reaction

PREDRAG JOVANOVIĆ, JELENA RANĐELOVIĆ, BRANKA IVKOVIĆ*, CRISTINA SUTEU**, ZORANA TOKIĆ VUJOŠEVIĆ and VLADIMIR SAVIĆ

Department of Organic Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11000 Belgrade, Serbia

*Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11000 Belgrade, Serbia

**Chiral Technologies Europe, Illkirch, Bd Gonthier d'Andernach, 67400, Illkirch, France

(Received 15 October, accepted 30 December 2013)

Chiral, polysubstituted proline esters, obtained via cycloaddition reactions of azomethine ylides, were studied as organocatalysts in the Michael reaction of aldehydes/ketones and vinylsulphones. Under optimised reaction conditions employing 10 mol % of the catalyst in wet CH2Cl2, the yields of the products were generally good while the enantioselectivity varied, reaching up to 52 %.

Keywords: Michael reaction; organocatalysis; proline derivatives.

Full Article - PDF 220 KB KB Supplementary Material PDF 147 KB Available OnLine: 10. 12. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 779–791 (2014)

UDC Sclerochloa dura+547.814.5+547.296.96:541.515:615.276-188; JSCS–4626; doi: 10.2298/JSC131202003B; Original scientific paper

Anti-inflAMmatory and antioxidant activities of Sclerochloa dura (Poaceae)

SYED MAJID BUKHARI, ASTRID JULLUMSTRØ FEUERHERM*, FAYSSAL BOULFRAD**, BOJAN ZLATKOVIĆ***, BERIT JOHANSEN* and NEBOJŠA SIMIĆ

Department of Chemistry, Norwegian University of Science and Technology, 7491 Trondheim, Norway

*Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway

**UFR de Pharmacie, Grenoble, France

***Faculty of Sciences, University of Niš, 18000 Niš, Serbia

(Received 2 December 2013, accepted 14 January 2014)

The plant Sclerochloa dura is traditionally used in South-East Serbia to treat menstrual disorders characterized by pain and excessive bleeding. According to statements of subjects, a reduction in bleeding and pain is experienced shortly after oral intake. The focus of this investigation was to determine the inhibitory effects of the plant on the arachidonic acid (AA) cascade along with the spectrophotometric determination of its antioxidant capacity. The AA release assay was performed using the human fibroblast-like synoviocyte cell line SW982 to determine the AA release and hence phospholipase A2 (PLA2) activity. The crude extract and subsequent fractions of S. dura inhibit IL-1 induced release of AA in a time- and dose-dependent manner in SW982 cells. The IC50 for the crude extract is 1.5 mg mL-1 at 4 and 24 h of stimulation. Treating the cells with 0.22, 0.11 and 0.06 mg mL-1 of a methanolic fraction resulted in 97, 91 and 63 % inhibition of AA-release, respectively. One milligrAM of the crude extract contained 34.78 μg pyrocatechol equivalent phenolic content, 22.80 μg quercetin equivalent flavonoid content and an antioxidant activity of 70.11 μg α-tocopherol equivalents. The strong inhibitory effects of the S. dura extracts on the AA cascade may explain the reported pain- and discomfort-relieving effects.

Keywords: arachidonic acid release assay; cytosolic phospholipase A2 enzyme; flavonoid content; free radical scavenging activity; phenolic content; SW 982 fibroblast-like synoviocytes.

Full Article - PDF 340 KB Available OnLine: 21. 10. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 793–804 (2014)

UDC 542.913+546.48+542.9+547.571+547.551+543.552:615.281/.282; JSCS–4627; doi: 10.2298/JSC130520110M; Original scientific paper

Synthesis, characterization, electrochemical behavior and antibacterial/antifungal activities of [Cd(L)X2] complexes with a new Schiff base ligand

MORTEZA MONTAZEROZOHORI, SAHAR YADEGARI and ASGHAR NAGHIHA*

Department of Chemistry, Yasouj University, Yasouj 75918–74831, Iran

*Department of Animal Sciences, Faculty of Agriculture, Yasouj University, Yasouj, Iran

(Received 20 May, revised 8 October 2013)

Abstract: A new symmetrical bidentate Schiff base ligand (L) was applied for the synthesis of some new cadmium coordination compounds having the general formula [Cd(L)X2], in which X is a halide or a pseudo-halide. The ligand and all the cadmium complexes were characterized by elemental analysis, FT-IR, 1H-NMR, 13C-NMR and UV–Vis spectroscopy and by molar conductance measurements. Electrochemical behavior of ligand and Cd(II) complexes were investigated by the cyclic voltAMmetry method. The morphology and shape of the [Cd(L)Cl2] particles were depicted by SEM. Antimicrobial properties, such as antibacterial and antifungal activities, of the complexes as compared with ligand were checked against three GrAM-negative bacteria: Escherichia coli (ATCC 25922), Pseudomunase aeroginosa (ATCC 9027) and Salmonella Spp. two GrAM-positive bacteria: Staphylococcus aureus (ATCC 6538) and Corynebacterium renale and three fungal strains, including Aspergillus niger, Penicillium chrysogenum and Candida albicans. The results revealed appropriate antibacterial and antifungal activities for all compounds, and it was found that coordination of the ligand to Cd(II) lead to an increase in the antimicrobial activities in most of cases.

Keywords: Schiff base; complex; bidentate; voltAMmetry; antibacterial; antifungal.

Full Article - PDF 422 KB Supplementary Material PDF 113 KB Available OnLine: 10. 12. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 805–813 (2014)

UDC 519.17–124+541.621:537.872’12; JSCS–4628; doi: 10.2298/JSC140120010F; Original scientific paper

A graph theoretical approach to cis/trans isomerism

BORIS FURTULA, GIORGI LEKISHVILI* and IVAN GUTMAN

Faculty of Science, University of Kragujevac, P. O. Box 60, 34000 Kragujevac, Serbia

*Department of Medicinal Chemistry, Tbilisi State Medical University, GE-0177, 31 Vazha-Pshavela Avenue, Tbilisi, Georgia, E-mail: lekishvili@tsmu.edu

(Received 20 January, revised 24 January, accepted 24 January 2014)

A simple graph-theory-based model is presented, by means of which it is possible to express the energy difference between geometrically non-equivalent forms of a conjugated polyene. This is achieved by modifying the adjacency matrix of the molecular graph, and including into it information on cis/trans constellations. The total π-electron energy thus calculated is in excellent agreement with the enthalpies of the underlying isomers and conformers.

Keywords: cis/trans isomerism; graph theory; molecular graph; total π-electron energy.

Full Article - PDF 314 KB Available OnLine: 28. 01. 2014. Cited by

J. Serb. Chem. Soc. 79 (7) 815–828 (2014)

UDC 546.19+549.623.83+66.081:546.723–31; JSCS–4629; doi: 10.2298/JSC130912017I; Original scientific paper

The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide

NIKOLA I. ILIĆ, SLAVICA S. LAZAREVIĆ, VLADANA N. RAJAKOVIĆ-OGNJANOVIĆ*, LJUBINKA V. RAJAKOVIĆ, ĐORĐE T. JANAĆKOVIĆ AND RADA D. PETROVIĆ

1Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia and 2Faculty of Civil Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, Belgrade, Serbia

(Received 12 September 2013, revised 13 January, accepted 5 March 2014)

The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 °C through batch studies. The influence of the initial pH value, the initial As concentration, the contact time and the type of water on the sorption capacity was investigated. Two types of water were used, deionised and groundwater. The maximal sorption capacity for As(III) dissolved in deionised water was observed at an initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, while a significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g-1 for As(III) and 4.2 mg g-1 for As(V) in deionised water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results showed that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has the potential for application in water purification processes.

Keywords: arsenic(III); arsenic(V); Fe(III)–sepiolite; sorption; pH influence.

Full Article - PDF 414 KB Available OnLine: 10. 03. 2014. Cited by

J. Serb. Chem. Soc. 79 (7) 829–842 (2014)

UDC 546–38+544.278–128:541.132.3+544.35.08; JSCS–4630; doi: 10.2298/JSC130817109G; Original scientific paper

Aqueous nicotine solutions: pH-measurements and salting-out effects – Analysis of the effective Gibbs energies of hydration and ionic strengths of the solutions

NIKOLA D. GROZDANIĆ, MARTA S. CALADO*, MIRJANA LJ. KIJEVČANIN, SLOBODAN P. ŠERBANOVIĆ and ZORAN P. VIŠAK*

Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia

*Centro de Química Estrutural, Instituto Superior Tecnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal

(Received 17 August, revised 2 October, accepted 19 October 2013)

This work is a continuation of previous studies on phase demixing – salting-out effects – in aqueous nicotine solutions. Thus, pH measurements were performed, allowing a brief analysis of the existing hydrogen bond interactions. Salting-out effects – the related experimental cloud point shifts – provoked by the addition of two inorganic salts, potassium nitrate and sodium sulfate, which have not hitherto been studied, were determined. Analysis of the current and previously reported salting-out/or salting-in phenomena in nicotine aqueous solutions was performed. In this respect, five studied salts were included: four inorganic salts (sodium chloride, potassium nitrate, sodium sulfate and trisodium phosphate (Na3PO4)), and ionic the liquid 1-ethyl-3-methylimidazolium ethyl sulfate ([C2mim][EtSO4], commercial nAMe ECOENG212Ò). Based on pH measurements, the effective Gibbs energies of hydration and the ionic strengths of the respective ternary solutions were calculated and plotted against the related cloud-point shifts caused by the addition of the salts. For the studied salts, the results and diagrAM obtained within this work may be used to predict the cloud-points shifts, based on the related quantities of the salts added and/or the molar Gibbs energies of hydration and/or ionic strengths requested in each case.

Keywords: inorganic salts; ionic liquids; pH measurements of solutions.

Full Article - PDF 232 KB Supplementary Material PDF 78 KB Available OnLine: 21. 10. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 843–866 (2014)

UDC 678.073’664:543.422.25:536.5.004.12; JSCS–4631; doi: 10.2298/JSC130819149P; Original scientific paper

Structural, thermal and surface characterization of thermoplastic polyurethanes based on poly(dimethylsiloxane)

MARIJA V. PERGAL, IVAN S. STEFANOVIĆ, DEJAN GOĐEVAC, VESNA V. ANTIĆ*, VESNA MILAČIĆ**, SANJA OSTOJIĆ***, JELENA ROGAN****, and JASNA DJONLAGIĆ****

Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade 11000, Serbia

*Faculty of Agriculture, University of Belgrade, Nemanjina 6, Belgrade 11000, Serbia

**North CAMpus Research Complex, B20, University of Michigan, Ann Arbor, MI 48109, USA

***Institute of General and Physical Chemistry, University of Belgrade, Studentski trg 12–16, Belgrade 11000, Serbia

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

(Received 19 August, revised 19 October, accepted 22 October 2013)

In this study, the synthesis, structure and physical properties of two series of thermoplastic polyurethanes based on hydroxypropyl-terminated poly(dimethylsiloxane) (HP-PDMS) or hydroxyethoxypropyl-terminated poly(dimethylsiloxane) (EO-PDMS) as soft segments, and 4,4′-methylenediphenyl diisocyanate and 1,4-butanediol as hard segments were investigated. The polyurethanes were synthesized by two-step polyaddition in solution. The effects of the type and content of PDMS segments on the structure, thermal and surface properties of copolymers were studied by 1H-, 13C-nuclear magnetic resonance (NMR) spectroscopy and two-dimensional NMR spectroscopies (heteronuclear multiple bond correlation (HMBC) and rotating-frAMe nuclear Overhauser effect (ROESY)), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide-angle X-ray scattering (WAXS), scanning electron microscopy (SEM) and water contact angle and water absorption measurements. Thermal properties investigated by DSC indicated that the presence of soft PDMS segments lowers the glass transition and melting temperatures of the hard phase as well as the degree of crystallinity. SEM analysis of the copolymers with a lower soft segment content confirmed the presence of spherulite superstructures, which arise from the crystallization of the hard segments. When compared with polyurethanes prepared from HP-PDMS, the copolymers synthesized from EO-PDMS with the sAMe content of the soft segments had a higher degree of crystallinity, better thermal stability and a less hydrophobic surface. The obtained results showed that the synthesized polyurethanes had good thermal and surface properties, which could be further modified by changing the type or content of the soft segments.

Keywords: thermoplastic polyurethanes; poly(dimethylsiloxane); 2D NMR spectroscopy; thermal properties, surface properties.

Full Article - PDF 532 KB Available OnLine: 11. 12. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 867–880 (2014)

UDC 677.022.3/.5+544.531:667.28+678.744:535.371; JSCS–4632; doi: 10.2298/JSC131014011D; Original scientific paper

Electrospinning of the laser dye rhodAMine B-doped poly(methyl methacrylate) nanofibers

RAMDAN M. DUKALI, IVANA M. RADOVIĆ, DUŠICA B. STOJANOVIĆ, DRAGUTIN M. ŠEVIĆ*, VESNA J. RADOJEVIĆ, DRAGAN M. JOCIĆ and RADOSLAV R. ALEKSIĆ

University of Belgrade, Faculty of Technology and Metallurgy, Belgrade

*University of Belgrade, Institute of Physics, Belgrade, Serbia

(Received 24 October 2013, revised 27 January, accepted 30 January 2014)

The electrospinning of rhodAMine B (RhB)-doped poly(methyl methacrylate) (PMMA) is presented as a promising technique for processing photoluminescent nanofibers. Nanofibers with concentrations of RhB in PMMA between 0.05 and 2.0 wt. % were studied. The FTIR spectrum, fiber morphology, thermal properties and optical properties of the nanofibers were investigated. Smooth, bead-free and nonporous nanofibers were obtained. Differential scanning calorimetry (DSC) results revealed that the glass transition temperature of the PMMA (Tg) increased with the increasing of RhB content up to 0.5 wt. % and thereafter decreased. The laser induced fluorescence (LIF) technique was used to study the fluorescence properties of the nanofibers. The maximum fluorescence emission was observed at a concentration of RhB of 0.2 wt. %.

Keywords: electrospinning; nanofibers; dye-doped PMMA; fluorescence.

Full Article - PDF 623 KB Available OnLine: 01. 02. 2014. Cited by

J. Serb. Chem. Soc. 79 (7) 881–895 (2014)

UDC 662.613.13:66.011+681.5.017:628.53; JSCS–4633; doi: 10.2298/JSC130614125B; Original scientific paper

An experimental and computational investigation of the effects of temperature on soot formation mechanisms

XIAOJIE BI*,**; MAOYU XIAO*, XINQI QIAO*, CHIA-FON F. LEE**,*** AND YU LIU****

*Key Laboratory for Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China

**Department of Mechanical Science and Engineering, University of Illinois at Urbana-ChAMpaign, IL, 61801, USA

***Center for Combustion Energy and State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

****Key Laboratory of Automobile DynAMic Simulation, Jilin University, Changchun, Jilin, 130012, China

(Received 14 June, revised 2 November, accepted 4 November 2013)

Effects of the initial AMbient temperature on combustion and soot emission characteristics of diesel fuel were investigated through experiments conducted in an optical constant volume chAMber and simulation using a phenomenological soot model. Four different initial AMbient temperatures were adopted in this research: 1000, 900, 800 and 700 K. In order to obtain a better prediction of soot behavior, the phenomenological soot model was revised to take into account the feedback of soot oxidation on the soot number density and good agreement was observed in the comparison of soot measurement and prediction. The results indicated that the ignition delay was prolonged with decreasing initial AMbient temperature. The heat release rate demonstrated the transition from mixing controlled combustion at high AMbient temperatures to the premixed combustion mode at low AMbient temperatures. At lower AMbient temperatures, soot formation and the oxidation mechanism were both suppressed. However, the soot mass concentration was finally reduced with decreasing initial AMbient temperature. Although the drop in AMbient temperature did not cool the mean in-cylinder temperature during the combustion, it did shrink the total area of local high equivalence ratios, in which soot usually is rapidly generated. At an initial AMbient temperature of 700 K, soot emissions were almost negligible, which indicates that sootless combustion might be achieved under super low initial temperature operation conditions.

Keywords: soot emission; constant volume chAMber; phenomenological soot model; multi-dimensional simulation.

Full Article - PDF 527 KB Supplementary Material PDF 253 KB Available OnLine: 07. 11. 2013. Cited by

J. Serb. Chem. Soc. 79 (7) 897–909 (2014)

UDC 633.61.002.68+577.11:628.3; JSCS–4634; doi: 10.2298/JSC130619153T; Original scientific paper

Bagasse wastewater treatment using biopolymer – A novel approach

KARICHAPPAN THIRUGNANASAMBANDHAM, VENKATACHALAM SIVAKUMAR and JEGANATHAN PRAKASH MARAN

Department of Food Technology, Kongu Engineering College, Perundurai, Erode-638052, TN, India

(Received 19 June, revised 9 December, accepted 13 December 2013)

In this study, the removal of turbidity, biological oxygen demand (BOD) and chemical oxygen demand (COD) in the treatment of bagasse-based wastewater from the paper and pulp industry were investigated via response surface methodology (RSM) under different operating conditions, such as agitation time (X1: 15–25 min), initial pH (X2: 4–8), chitosan dose (X3: 1.2–2.0 g L-1) and settling time (X4: 40–80 min). The obtained experimental data were fitted to a second-order polynomial equation using multiple regression analysis and ANOVA (analysis of variance) was used to exAMine the significance of the developed mathematical models. The 3-D response surface plots were derived from the mathematical models in order to study the interactive effects of the process variables on the treatment efficiency. The Derringer desired function methodology was applied to determine the optimal conditions, which were found to be: an agitation time of 20 min, an initial pH of 6, a chitosan dose of 1.8 g L-1 and settling time of 60 min. Under these conditions, the removal of turbidity, BOD and COD were found to be 84, 90 and 93 %, respectively.

Keywords: chitosan; coagulation; Bagasse wastewater; BBD design; model development.

Full Article - PDF 282 KB Available OnLine: 27. 12. 2013. Cited by

Journal Home Page

July 30. 2014.

For more information contact: JSCS-info@shd.org.rs