Vol 78, No 9 - Abstracts

JSCS Vol 78, No. 9

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Whole issue - PDF 3,697 KB

J. Serb. Chem. Soc. 78 (9) 1269–1289 (2013)

UDC 547.466.3+641.3:641.1:613:616.1:61614–002; JSCS–4496; doi:10.2298/JSC130402040R Review

REVIEW

Polyunsaturated fatty acids in health and disease

DANIJELA RISTIĆ-MEDIĆ, VESNA VUČIĆ, MARIJA TAKIĆ, IVANA KARADŽIĆ AND MARIJA GLIBETIĆ

Centre of Research Excellence in Nutrition and Metabolism, Institute for Medical Research, University of Belgrade, Dr Subotića 4, 11000 Belgrade, Serbia

(Received 2 April, revised 15 April 2013)

Polyunsaturated fatty acids (PUFAs) are necessary for overall health. Two PUFAs fAMilies, n-6 and n-3 fatty acids, are physiologically and metabolically distinct. The proportion of PUFAs in serum and erythrocyte phospholipids, which depends on endogenous metabolism controlled by genetic polymorphisms and dietary intake, is an important determinant of both health and disease. Both n-3 and n-6 PUFAs are processed to powerful promoters of eicosanoids synthesis at the cyclooxygenase and lipoxygenase level. Evidence from observational and intervention studies suggest that n-3 PUFAs are cardioprotective, perhaps through their anti-inflAMmatory, anti-arrhythmic, lipid-lowering and antihypertensive effects. In contrast, dietary n-6 PUFAs have pro-inflAMmatory effects. Low n-3 and elevated n-6 PUFAs levels were found in patients with cancer on different sites. The present review focuses on current knowledge related to PUFAs intake and status in health and disease, with reference to the Serbian population.

Keywords: n-3; n-6; PUFA; inflAMmation; cardiovascular disease; chronic diseases.

Full Article - PDF 286 KB Available OnLine: 24. 04. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1291–1299 (2013)

UDC 547.815+542.9:547.7+542.913:546.185’226–32; JSCS–4497; doi: 10.2298/JSC121108008K Original scientific paper

Phosphosulfonic acid, an efficient solid acid catalyst for the one-pot preparation of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthenes under solvent-free conditions

ALI REZA KIASAT, ARASH MOURADZADEGUN and SEYYED JAFAR SAGHANEZHAD

Chemistry Department, College of Science, Shahid ChAMran University, P. O. Box 61357-4-3169, Ahvaz, Iran

(Received 8 October 2012, revised 16 January 2013)

An expeditious procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthenes through a one-pot pseudo three component condensation of β-naphthol or dimedone with various aromatic aldehydes is described. This green protocol is catalyzed by phosphosulfonic acid, and proceeds efficiently in the absence of any organic solvent under optimized, mild, green and environmentally benign reaction conditions in high yields within 20–55 min.4

Keywords: xanthenes; one-pot reaction; dimedone; β-naphthol; solvent-free; phosphosulfonic acid.

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J. Serb. Chem. Soc. 78 (9) 1301–1308 (2013)

UDC 547.532’815+542.913:57–188:615.277; JSCS–4498; doi: 10.2298/JSC120925060L Original scientific paper

Synthesis and biological evaluation of novel benzo[b]xanthone derivatives as potential antitumor agents

LIN LUO, JIANG-KE QIN, ZHI-KAI DAI*and SHI-HUA GAO

Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry &AMp; Chemical Engineering of Guangxi Normal University, Guilin 541004, China

*Department of Pharmacology, Pharmaceutical Institute of Guilin Medical University, Guilin 541004, China

(Received 25 September 2012, revised 2 May 2013)

Nine novel AMinoalkoxy substituted benzo[b]xanthones (3a–i) were synthesized. Their antitumor activities were evaluated in five human solid tumor cell lines, including Hep-G2, BEL-7402, HeLa, MGC-803 and CNE, by the MTT (2-(4,5-dimethyl-thiazol-2-yl)-3,5-diphenyl-2H-tetrazolium bromide) method. The results showed that most of the compounds displayed moderate to good inhibitory activities on the tested cancer cell lines in vitro, AMong them compounds 3a and 3h showed higher antitumor activity than the other tested compounds against most cell lines. The influences of two kinds of structural factors, i.e., the terminal AMino group and length of the carbon spacers, on the anticancer activities were explored to discuss preliminary structure–activity relationships.

Keywords: xanthone; benzo[b]xanthone; in vitro anticancer activity.

Full Article - PDF 252 KB Supplementary Material PDF 163 KB Available OnLine: 17. 06. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1309–1322 (2013)

UDC 663.222:663.251:547.973:543.544; JSCS–4499; doi: 10.2298/JSC130101026D Original scientific paper

Characterisation of Vranec, Cabernet Sauvignon and Merlot wines based on their chromatic and anthocyanin profiles

MAJA DIMITROVSKA, ELENA TOMOVSKA* and MIRJANA BOCEVSKA*

Institute of Public Health, 50 Divizija, 6, 1000 Skopje, FYR Macedonia

*Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University, Rudjer Boskovic, 16, 1000 Skopje, FYR Macedonia

(Received 1 January, revised 21 February 2013)

Wines of three different grape varieties, Vranec, Cabernet Sauvignon and Merlot, were characterised in terms of their anthocyanin and chromatic profiles, total polyphenols and antioxidant potential. The total, monomeric, polymeric and co-pigmented anthocyanins were determined by spectrophotometry and the individual anthocyanin compounds were quantified using HPLC–DAD. The chromatic profile was evaluated according to colour density, hue, % red, % blue, % yellow and brilliance (dA). The established data were submitted to analysis of variance and principle component analysis in order to evaluate their potential for differentiation of wines according to variety and vintage. The Vranec wines showed distinctive characteristics, with the highest content of anthocyanins and values of colour intensity, % red and dA, compared to the other two studied varieties. The content of petunidin-3-glucoside, peonindin-3-glucoside and anthocyanin acetates were established as possible markers for the differentiation of Vranec wines from Cabernet Sauvignon and Merlot wines. However, none of the assayed parAMeters could be used for the differentiation of Cabernet Sauvignon from Merlot wines. It was observed that wine age limits the successful classification of the wines by variety according to anthocyanins. The chromatic parAMeters allowed young (aged up to 1 year) to be distinguished from old Vranec wines.

Keywords: wine; anthocyanins; Vranec; colour; differentiation.

Full Article - PDF 279 KB Available OnLine: 27. 02. 2013. Cited by

J. Serb. Chem. Soc. 78 (10) 1595–1607 (2013)

UDC 546.814+547.563+543.422.25:615.28; JSCS–4500; doi: 10.2298/JSC120917030M; Original scientific paper

Reactions of tin and triorganotin(IV) isopropoxides with thymol derivative: synthesis, characterization and in vitro antimicrobial screening

GARIMA MATELA, ROBINA AMAN, CHETAN SHARMA* and SMITA CHAUDHARY**

Department of Chemistry, Kumaun University, S. S. J. CAMpus Almora-263 601, India

*Department of Microbiology, Kurukshetra University, Kurukshetra, Haryana-136 119, India

**Institute of Environmental Studies, Kurukshetra University, Kurukshetra, Haryana-136 119 India

(Received 17 September 2012, revised 6 March 2013)

New series of diisopropoxytin and triorganotin(IV) complexes of H2hbgl (1) of the general formula Sn(OPri)2(hbgl) (2), Sn(OPri)2(Hhbgl)2 (3), Ph3Sn(Hhbgl) (4), Bu3Sn(Hhbgl) (5) and Me3Sn(Hhbgl) (6), where H2hbgl is a ligand of a thymol derivative, nAMely, N-(2-hydroxy-3-isopropyl-6-methylbenzyl)glycine, were synthesized by reacting tin and triorganotin(IV) chloride with the ligand, with the aid of sodium isopropoxide in appropriate stiochiometric ratios (1:1 and 1:2). These complexes were characterized by elemental analysis, IR and 1H-NMR. The spectral data suggest that the carboxylate group, in complexes 2–5, was bonded in a bidentate manner, while a unidentate bonding was observed in complex 6. All five complexes were tested in vitro for their antibacterial activity against GrAM-positive bacteria, nAMely, Staphylococcus aureus MTCC 96, Bacillus subtilis MTCC 121, and two GrAM-negative bacteria, nAMely, Escherichia coli MTCC 1652 and Pseudomonas aeruginosa MTCC 741. All five complexes were also tested against three pathogenic fungal strains, nAMely, Aspergillus niger, Aspergillus flavus and Penicillium sp.

Keywords: tri-organotin(IV) complexes; IR, NMR spectral studies; antifungal activity; antibacterial activity.

Full Article - PDF 230 KB Supplementary Material PDF 151 KB Available OnLine: 07.03. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1335–1349 (2013)

UDC 546.650.3+546.13+547.586.2–384:542.913:536.5.004.12; JSCS–4501; doi: 10.2298/JSC121203043F; Original scientific paper

Magnetic, thermal and spectroscopic properties of lanthanide(III) 2-(4-chlorophenoxy)acetates, Ln(C₈H₆ClO₃)₃·nH₂O

WIESŁAWA FERENC, BEATA CRISTÓVÃO and JAN SARZYŃSKI*

Faculty of Chemistry, Maria Curie-Skłodowska University, 20–031 Lublin, Poland

*Institute of Physics, Maria Curie-Skłodowska University, 20–031, Lublin, Poland

(Received 3 December 2012, revised 6 April 2013)

2-(4-Chlorophenoxy)acetates of lanthanides(III) were synthesized as polycrystalline hydrated solids with the general formulae: Ln(C8H6ClO3)3·2H2O (Ln = La(III), Pr(III), Sm(III), Eu(III) or Tb(III)); Ln(C8H6ClO3)3·H2O (Ln = Dy(III)) and Ln(C8H6ClO3)3·3H2O (Ln = Er(III), Tm(III), Yb(III) and Lu(III). The complexes were characterized by elemental analysis, FTIR spectroscopy, magnetic and thermogravimetric studies and X-ray diffraction (XRD) analysis. The complexes have colours typical for the lanthanide(III) ions. The carboxylate groups bind as bidentate chelating agents. On heating to 1273 K in air, the complexes decompose in three steps. First they dehydrate in one stage to form anhydrous salts that then decompose to the oxides of the respective metals with the intermediate formation of their oxychlorides. The gaseous products of the thermal decomposition of the compounds under nitrogen were also determined. The magnetic susceptibilities of the complexes were measured over the ranges 76-303 K and 1.8-303 K, and their magnetic moments were calculated. The results showed that the 2-(4-chlorophenoxy)acetates of lanthanides(III) are high-spin complexes with weak ligand fields.

Keywords: 2-(4-chlorophenoxy)acetates; thermal stability; magnetic properties; lanthanides.

Full Article - PDF 243 KB Available OnLine: 23. 04. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1351–1357 (2013)

UDC 547.53+547.535:544.112:548.1.023:548.115; JSCS–4502; doi: 10.2298/JSC130218033C; Original scientific paper

On benzenoid systems with a minimal number of inlets

ROBERTO CRUZ, IVAN GUTMAN* and JUAN RADA

Instituto de Matemáticas, Universidad de Antioquia, Medellín, Colombia

*Faculty of Science, University of Kragujevac, P. O. Box 60, 34000 Kragujevac, Serbia and Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

(Received 18 February, revised 21 March 2013)

Inlets are features on the perimeter of a benzenoid system that determine numerous of its electronic and topological properties. A class of large benzenoid systems is constructed, having a small number of inlets. It is shown that the minimal number of inlets in a benzenoid system with h hexagons is less than or equal to .

Keywords: benzenoid molecule; benzenoid hydrocarbon; perimeter (of benzenoid system); hexagonal system; inlet; number of inlets.

Full Article - PDF 431 KB Available OnLine: 24. 03. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1359–1372 (2013)

UDC 547.426.1+66.094.3+544.478+546.92:547.474.3:66.061; JSCS–4503; doi: 10.2298/JSC121203037S; Original scientific paper

Selective liquid phase oxidation of glycerol to glyceric acid over novel supported Pt catalysts

ELINA SPROGE, SVETLANA CHORNAJA, KONSTANTINS DUBENCOVS, SVETLANA ZHIZHKUN1, VALDIS KAMPARS, VERA SERGA*, LIDIJA KULIKOVA* AND ERIKS PALCEVSKIS*

Faculty of Material Science and Applied Chemistry, Riga Technical University Azenes Str. 14/24, Riga, LV-1048, Latvia

*Institute of Inorganic Chemistry, Riga Technical University, Miera str. 34, Salaspils, LV-2169, Latvia

(Received 3 December 2012, revised 26 February 2013)

Several supported platinum catalysts were prepared by the extractive–pyrolytic method for the selective production of glyceric acid from glycerol. Al2O3, Y2O3, Lu2O3, ZrO2–Y2O3 TiO2, SG, Fe2O3, γ-AlO(OH) and C were used as the catalyst supports. Glycerol oxidation was performed in alkaline solutions and oxygen was used as the oxidant. The optimal catalyst preparation parAMeters and glycerol oxidation conditions to obtain glyceric acid were determined. The best result (57 % selectivity to glyceric acid with 92 % glycerol conversion) was achieved on a 4.8 % Pt/Al2O3 catalyst.

Keywords: glycerol oxidation; supported platinum catalysts; glyceric acid; extractive–pyrolytic method.

Full Article - PDF 326 KB Available OnLine: 07. 04. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1373–1385 (2013)

UDC 612.46:547.476:544.6.076.32–039.59; JSCS–4504; doi:10.2298/JSC121228032N; Original scientific paper

The use of a gold electrode for the determination of AMphetAMine derivatives and application to their analysis in human urine

MARINA M. NEVEŠĆANIN, MILKA L. AVRAMOV IVIĆ*, SLOBODAN D. PETROVIĆ**, DUŠAN Ž. MIJIN**, SONJA N. BANOVIĆ STEVIĆ AND VLADISLAVA M. JOVANOVIĆ*

BIA, Institute of security, Kraljice Ane bb, 11000 Belgrade, Serbia

*ICTM, Institute of Electrochemistry, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia

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

(Received 28 December 2012, revised 7 March 2013)

The catalytic abilities of a gold electrode were tested for the quantitative determination of AMphetAMine (A) and 3,4-methylenedioxy-N-methylAMphetAMine (MDMA) standards by their oxidation using cyclic voltAMmetry (CV). The values of the oxidative currents of A and MDMA standards at 0.80 V vs. SCE in 0.05 M NaHCO3 at a scan rate of 50 mV s-1 were linear functions of the concentration in range of 110.9–258.9 mM and 38.7–229.2 mM, respectively. Square wave voltAMmetry (SWV) revealed a linear increase of current with the concentration of MDMA (range 30.9–91.6 mM), which enabled the quantitative determination of AMphetAMine derivates. SWV analysis was also successfully performed in spiked urine sAMples. A and MDMA in the presence of sucrose and as a content in illegally produced tablets were also determined. The voltAMmetric determinations of A and MDMA derivatives using CV and SWV at gold a electrode are rapid, selective and simple procedures and their accuracy was confirmed with a reference method, high performance liquid chromatography (HPLC). The analysis of spiked urine sAMples offers an additional possibility for the rapid detection of A and MDMA in human urine.

Keywords: AMphetAMine derivatives; cyclic voltAMmetry; square wave voltAMmetry; spiked urine sAMples.

Full Article - PDF 303 KB Available OnLine: 14. 03. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1387–1395 (2013)

UDC 541.135:548.004.12+669–492.4; JSCS–4505; doi: 10.2298/JSC130211034N; Original scientific paper

Influence of the type of electrolyte on the morphological and crystallographic characteristics of lead powder particles

NEBOJŠA D. NIKOLIĆ, VESNA M. MAKSIMOVIĆ*, GORAN BRANKOVIĆ**, PREDRAG M. ŽIVKOVIĆ*** and MIOMIR G. PAVLOVIĆ

ICTM – Center of Electrochemistry, University of Belgrade, Njegoševa 12, P. O. Box 473, 11001 Belgrade, Serbia

*Vinča Institute of Nuclear Sciences, University of Belgrade, P. O. Box 522, 11001 Belgrade, Serbia

**Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1a, Belgrade, Serbia

***Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, P. O. Box 3503, 11001 Belgrade, Serbia

(Received 11 February, revised 13 March 2013)

Lead electrodeposition processes from basic (nitrate) and complex (acetate) electrolytes were mutually compared by scanning electron microscopy and X-ray diffraction investigation of the produced powder particles. The shape of dendritic particles strongly depended on the type of electrolyte. Dendrites composed of a stalk and weakly developed primary branches (the primary type) were predominantly formed from the basic electrolyte. RAMified dendrites composed of a stalk and of both primary and secondary branches (the secondary type) were mainly formed from the complex electrolyte. In both types of powder particles, Pb crystallites were predominantly oriented in the (111) plane. The formation of powder particles of different shapes with strong (111) preferred orientation is discussed and explained by consideration of the general characteristics of the growth of crystals in electrocrystallization processes.

Keywords: electrodeposition; lead; powder; dendrite; scanning electron microscopy (SEM); X-ray diffraction (XRD) analysis.

Full Article - PDF 289 KB Available OnLine: 28. 03. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1397–1411 (2013)

UDC 547.233–304.2:544.4+544.6:547.313’733–31+547.538+546.226; JSCS–4506; doi: 10.2298/JSC120927036Y; Original scientific paper

Application of commercial poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) for electrochemical sensing of dopAMine

YUANYUAN YAO, YANGPING WEN*, JINGKUN XU, LONG ZHANG** and XUEMIN DUAN**

Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China

*Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China

**School of Pharmacy, Jiangxi Science and Technology Normal University, Nanchang 330013, China

(Received 24 September 2012, revised 26 March 2013)

In this paper, a simple and stable composite electrode based on the intrinsically conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and Nafion®, an ion-exchange polymer, was successfully fabricated by drop-coating the blended commercially available PEDOT:PSS aqueous dispersion and Nafion® solution on the surface of a glassy carbon electrode (GCE). PEDOT:PSS was used as the matrix, while Nafion® was employed to improve the immobilization stability of the composite films and adhesion to the electrode surface in comparison with PEDOT:PSS films. Cyclic voltAMmetry, differential pulse voltAMmetry, electrochemical impedance spectroscopy and scanning electron microscopy were utilized to characterize the properties of this composite electrode. The as-proposed composite electrode displayed good water-stability. Meanwhile, the composite electrode was applied to electrochemical sensing of dopAMine, and the performance of PEDOT:PSS–Nafion® composite film was evaluated. The obtained results demonstrated that PEDOT:PSS–Nafion® composites are promising candidates for modification of electrode material used in electrochemical sensing and other electrocatalytic applications.

Keywords: PEDOT:PSS; Nafion®; electrocatalysis; dopAMine; electrochemical sensor.

Full Article - PDF 946 KB Available OnLine: 07. 04. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1413–1423 (2013)

UDC 577.182.24:537.363:543.544; JSCS–4507; doi: 10.2298/JSC121117028H; Original scientific paper

Development of a capillary electrophoresis method for the simultaneous determination of cephalosporins

GABRIEL HANCU, HAJNAL KELEMEN, AURA RUSU and ÁRPÁD GYÉRESI

Faculty of Pharmacy, University of Medicine and Pharmacy Târgu Mureş, Gh. Marinescu street 32, 540131 Târgu Mureş, Romania

(Received 17 November 2012, revised 22 February 2013)

A rapid and simple capillary electrophoresis method has been developed for the simultaneous determination of six extensively used cephalosporin antibiotics (cefaclor, cefadroxil, cefalexin, cefuroxim, ceftazidim and ceftriaxon). The determination of cephalosporins was performed at pH 6.8, using a 25 mM phosphate–25 mM borate mixed buffer, and a voltage of 25 kV at a temperature of 25 °C. A baseline separation was achieved in approximately 10 min. The separation resolution was increased by the addition of an anionic surfactant, 50 mM sodium dodecyl sulfate, to the buffer solution. The proposed separation was evaluated based on the detection and quantification limits, effective electrophoretic mobility and relative standard deviation for the migration times and peak areas.

Keywords: cephalosporins; capillary zone electrophoresis; micellar electrokinetic chromatography.

Full Article - PDF 322 KB Available OnLine: 01. 03. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1425–1441 (2013)

UDC 678.746–13+664.2:542.92.000.57:547.391.3:628.113(282); JSCS–4508; doi: 10.2298/JSC121216051N; Original scientific paper

Biodegradation of starch–graft–polystyrene and starch–graft–poly(methacrylic acid) copolymers in model river water

VLADIMIR NIKOLIĆ, SAVA VELIČKOVIĆ*, DUŠAN ANTONOVIĆ* and ALEKSANDAR POPOVIĆ**

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

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

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

(Received 16 December 2012, revised 8 May 2013)

In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different AMine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch–graft–poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch–graft–polystyrene had partially degraded (45.8–93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the sAMples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the sAMples were established.

Keywords: graft copolymers; model river water; degradation study; statistical analysis.

Full Article - PDF 779 KB Available OnLine: 19. 05. 2013. Cited by

J. Serb. Chem. Soc. 78 (9) 1443–1460 (2013)

UDC 547.534:536.5.004.12:547.372:541.25:532.13; JSCS–4509; doi: 10.2298/JSC121210031S; Original scientific paper

Thermophysical properties of binary mixtures of N,N-dimethylformAMide with three cyclic ethers

BISWAJIT SINHA, RAJENDRA PRADHAN*, SANJOY SAHA**, DHIRAJ BRAHMAN and ABHIJIT SARKAR

Department of Chemistry, University of North Bengal, Darjeeling-734013, India,

*St. Joseph’s College, Darjeeling-734101, India

**Department of Chemistry, Kalimpong College, Kalimpong-734301, India

(Received 10 December 2012, revised 7 March 2013)

Densities and viscosities of binary mixtures consisting of tetrahydrofuran (THF), 1,3-dioxolane (1,3-DO) and 1,4-dioxane (1,4-DO) with N,N-dimethylformAMide (DMF) over the entire range of composition were measured at the temperatures 298.15, 308.15 and 318.15 K and at atmospheric pressure. The ultrasonic speeds of sound of these binary mixtures were measured at AMbient temperature and atmospheric pressure (T = 298.15 K and p == 1.01×105 Pa). The various experimental data were utilized to derive the excess molar volumes , excess viscosities (ηE) and excess isentropic compressibilities Using the excess molar volumes , the excess partial molar volumes ( and ) and excess partial molar volumes at infinite dilution (and ) of each liquid component in the mixtures were derived and are discussed. The excess molar volumes as a function of composition at AMbient temperature and atmospheric pressure were used to test further the applicability of the Prigogine–Flory–Patterson (PFP) theory to the experimental binaries. The excess properties were found to be either negative or positive depending on the nature of molecular interactions and structural effects of the liquid mixtures.

Keywords: N,N-dimethylformAMide; cyclic ethers; excess molar volumes; excess viscosities; excess isentropic compressibilities; Prigogine–Flory–Patterson theory.

Full Article - PDF 298 KB Supplementary Material PDF 183 KB Available OnLine: 08. 03. 2013. Cited by

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