YU-ISSN 0352-5139
J.Serb.Chem.Soc. Vol 68, No 8–9(2003)
CONTENTS
Organic Chemistry and Biochemistry
A. Georgakopoulos: Aspects of solid state 13C CPMAS NMR spectroscopy in coals from the Balkan peninsula
599
R. G. Patel., J. V. Patel, M. P. Patel and R. G. Patel: Synthesis and characterization of ether linkage containing bis-fluoran compounds
607
D. Markovi}: Energy storage in the photosynthetic electron-transport chain. An analogy with Michaelis-Menten kinetics
615
Polymers
S. Koseva, S. Brezovska, V. Bo{evska and D. Burevski: Bentonite, stabilizer for suspension polymerization
629
Inorganic Chemistry
S. S. Konstantinovi}, B. C. Radovanovi}, @. Caki} and V. Vasi}: Synthesis and characterization of Co(II), Ni(II), Cu(II) and Zn(II) complexes with 3-salicylidenehydrazono-2-indolinone
641
Electrochemistry
M. G. Pavlovi}, N. D. Nikoli} and K. I. Popov: The current efficiency during the cathodic period of reversing current in copper powder deposition and the overall current efficiency
649
Materials
B. R. Simonovi}, S. V. Mentus and R. Dimitrijevi}: Kinetic and structural aspects of tantalum hydride formation
657
D. Manasijevi}, D. @ivkovi}, I. Katayama and @. @ivkovi}: Calculation of activities in some gallium-based systems with a miscibility gap
665
E. Garskaite, D. Jasaitis and A. Kareiva: Sol-gel preparation and electrical behaviour of Ln: YAG (Ln = Ce, Nd, Ho, Er)
677
Analytical Chemistry
D. K. Singh, B. Srivastava and A. Sahu: Spectrophotometric determination of ajmaline and brucine by Folin Ciocalteu’s reagent
685
M. Jeliki}-Stankov, P. Djurdjevi} and D. Stankov: Determination of uric acid in human serum by an enzymatic method using N-methyl-N-(4-aminophenyl)-3-methoxyaniline reagent
691
J.Serb.Chem.Soc. 68 (8–9)599–605(2003)
UDC 553.941.97:543.422.25(495)(497)
JSCS – 3068
Original scientific paper
Aspects of solid state 13C CPMAS NMR spectroscopy in coals from the Balkan peninsula
ANDREAS GEORGAKOPOULOS
School of Geology, Department of Mineralogy-Petrology-Economic Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece (E-mail: )
(Received 3 March 2003)
Abstract: The cross-polarized magic-angle-spinning NMR (CPMAS-NMR) technique was used in this work to assess the carbon distribution in coals of different rank (peat, lignite, xylite, sub-bituminous coal) from important deposits in Greece and Bulgaria. The technique is assumed to be only semiquantitative, due to a number of interferences, such as spinning side bands (SSB) in the spectra, paramagnetic species in the samples, and low or remote protonation of aromatic carbons. The Bulgarian sub-bituminous coal shows the greatest amounts of aromatic structures. The lignite sample from the Drama basin, Northern Greece, is relatively unaltered and largely unweathered, and shows the greatest amounts of aliphatic groups. The 13C-NMR spectra of Pliocene lignites from endemic areas in Serbia and Montenegro and Bosnia, taken from published papers, show significantly more intense resonances for methoxyl, phenolic, and polysaccharide moieties compared to the Drama lignite NMR spectrum. Xylite reveals high contents of carbohydrates.
Keywords: Balkan endemic nephropathy, 13C CPMAS-NMR, Greece, lignite, peat, sub-bituminous coal, xylite.
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J.Serb.Chem.Soc. 68(8–9)607–613(2003)
UDC 547.686:542.913:681.7.046
JSCS – 3069
Original scientific paper
Synthesis and characterization of ether linkage containing bis-fluoran compounds
RITESH G. PATEL, JIGNESH V. PATEL, MANISH P. PATEL and RANJAN G. PATEL
Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar-388 120, Gujarat, India
(Received 8 January, revised 28 March 2003)
Abstract: 2’-Chloro-6’-diethylaminofluoran and 2’-chloro-3’-methyl-6’-diethylaminofluoran were reacted with various diphenols in dimethyl formamide in the presence of potassium carbonate to give the related bis-fluoran compounds. All the synthesized derivatives were identified by conventional methods (IR, 1H-NMR), elemental analysis and UV-visible spectroscopy in organic solvent and 95 % acetic acid. All the fluoran compounds change their colour in acidic media.
Keywords: synthesis, bisfluoran compounds, colour change in acidic media.
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J.Serb.Chem.Soc. 68(8–9)615–628(2003)
UDC 531.61.094.4:541.144:531.3
JSCS – 3070
Original scientific paper
Energy storage in the photosynthetic electron-transport chain. An analogy with Michaelis-Menten kinetics
DEJAN MARKOVI]
Faculty of Technology, 16000 Leskovac, Serbia and Montenegro (E-mail: )
(Received 28 August 2002)
Abstract: Simultaneous measurements of fluorescence and thermal emission have been performed by applying combined fluorescence and photoacoustic techniques on isolated thylakoids pretreated by prolonged illumination with saturating light. The traces were used to create Lineweaver-Burk type plots, proving clearly at least a formal analogy between the kinetics of the mechanisms governing fluorescence and thermal emission from isolated thylakoids and Michaelis-Menten kinetics of enzymatic reactions. Two characteristic parameters were calculated from them (energy storage and half-saturation light intensity) in order to obtain a basic, initial response of the photosynthetic apparatus functioning under photoinhibition stress.
Keywods: photosynthetic electron-transport, reaction centers, energy storage, fluorescence, thermal emission.
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J.Serb.Chem.Soc. 68(8–9)629–639(2003)
UDC 666.32:66.095.26+66–948
JSCS – 3071
Original scientific paper
Bentonite, stabilizer for suspension polymerisation
S. KOSEVA, S. BREZOVSKA, V. BO[EVSKA and D. BUREVSKI
University “Sv. Kiril i Metodij”, Faculty of Technology and Metallurgy, Rudjer Bo{kovi} bb, 1000 Skopje, R. of Macedonia
(Received 11 October 2002, revised 7 February 2003)
Abstract: In suspension polymerizations, stabilizers play a crucial role in the particle formation. An effective stabilizer must be able to maintain complete coverage of the surface by both physical and/or anchoring adsorption. In this work the possibility of using original bentonite and bentonite with a high percentage of montmorillonite, their acid-activated and monocationic forms as mixed stabilizer has been investigated. Styrene was used as the monomer. Beads of polystyrene with spherical or elliptical shape were obtained, depending on form of the used bentonite. The results are discussed in terms of the acidity of the mineral surface, amphiphilic characteristic of the clay and the change of the contact angle between organic / water / mineral phase.
Keywords: bentonite, stabilization, polymerization, surface pressure, acidic surface.
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1. E. A. Grulke, “Suspension polymerization” in Encyclopedia of Polymer Science and Engineering, H. F. Mark, N. M. Bikales, C. G. Overberger, G. Menges, J. I. Kroschwitz, Eds., Wiley, N. Y., 1989, vol. 16, pp. 443–473