JSCS Vol 64, No. 5-6
Adobe Acrobat version
These articles were created using Adobe
Acrobat and were compressed using WinZip |
To
download the latest
|
|
To download the text of the whole issue
click here (4.50
MB - WinZip file) |
To
download the latest
|
Impresum (89 KB - WinZip file); Content of Vol 64, No. 5-6 (72 KB - WinZip file); Instruction
for authors (37 KB - pdf file)
J.
Serb. Chem. Soc. 64 (5– 6) 317-340 (1999)
UDC 66.022.03:543.251:621. 793
JSCS-2673
Review paper
R E V I E W
Mass
transfer during electrodeposition of metals at a periodically changing rate
MIODRAG D. MAKSIMOVIC and KONSTANTIN I. POPOV
Faculty of Technology and
Metallurgy, University of Belgrade, P.O.Box 3503, YU–11120 Belgrade, Yugoslavia
(Received
2 February 1999)
1.
Introduction
2.
Mass transfer in the steady state periodic condition
2.1.
Reversing current
2.2.
Pulsating current
2.3.
Alternating current superimposed on direct current
3.
The influence of the charge and discharge of the electrical double layer
4.
The validity of the mathematical model
4.1.
Reversing current in the millisecond range
4.2.
Reversing current in the second range
4.3.
Pulsating current
4.4.
Pulsating overpotential
5.
Conclusion
Key
words: mass-transfer, electrodeposition, reversing current, pulsating
current, alternating current superimposed on direct current, pulsating
overpotential.
To download this article click here (1.095 KB WinZip file)
J.
Serb. Chem. Soc. 64 (5- 6) 341-347 (1999)
UDC 621.352:537.313/.314:543.251
JSCS-2674
Original scientific paper
The current distribution in an
electrochemical cell. Part IV. The relation to the Haring-Blum method
KONSTANTIN I. POPOV, SLAVISA M. PESIC* and TANJA M. KOSTIC
Faculty of Technology and
Metallurgy, University of Belgrade, Karnegijeva 4, P. O. Box 3503, YU-11120
Belgrade, Yugoslavia,
*Ei-Stampana kola d.d., Printed Circuit Board Factory, Bul. Cara
Konstantina 80-84, YU-18000 Nis, Yugoslavia
(Received
26 January, revised 25 February 1999)
It
was shown that the current density-cell voltage curves recorded in a cell with
parallel plate electrodes for different distances between the edges of the
electrodes and side walls of the cell can be used to determine the current
distribution in cells of the Haring-Blum type.
Key
words: metal electrodeposition, electrochemical cell, current distribution.
To download this article click here (335 KB WinZip file)
J. Serb. Chem. Soc. 64 (5- 6) 349-358 (1999)
UDC 547.979.732:546.56/.562
JSCS-2675
Original scientific paper
Cretaceous-Tertiary boundary layer
at Stevns Klint (Denmark): copper and copper(II) porphyrins
PAVLE I. PREMOVIC, NIKOLA D. NIKOLIC, IVANA R. TONSA, DEJAN T.
DULANOVIC and MIRJANA S. PAVLOVIC*
Laboratory for Geochemistry and
Cosmochemistry, Department of Chemistry, Faculty of Science, University of Ni{,
P.O.Box 91, YU-18000 Nis, Yugoslavia and
*Vin~a Institute of Nuclear Sciences, P.O. Box 522, YU-11001
Belgrade, Yugoslavia
(Received
2 September 1998, revised 11 February 1999)
High
concentrations (up to 4000 ppm) of copper(II) porphyrins have been detected in
the kerogen of the Cretaceous/Tertiary (KT) boundary informal type sediment,
the Fish Clay, at Stevns Klint, Denmark. These pigments have also been found in
the Danish KT sediment at Nye Klov, which is about 300 km away from Stevns
Klint. However, copper(II) porphyrins cannot be detected in the Danich boundary
rock of the Dania site, which is separated from Stevns Klint by about 200 km.
It is proposed that the kerogen copper(II) porphyrins are derived from humic
materials of terrestrial (peat/soil) sources already enriched with these
compounds, which were redeposited in the Danish KT boundary Basin. In addition,
our results show that the kerogen copper(II) porphyrins are present, for
comparison, in the Permian Kupferschiefer shale from Poland. The amounts are
comparable to those in the Fish Clay kerogen. To our opinion, the same
processes responsible for the kerogen copper(II) porphyrin enrichment have
occurred in the Stevns Klint KT boundary sediment and in the Kupferschiefer.
Key
words: copper, porphyrins, kerogen, electron spin resonance.
To download this article click here (521 KB WinZip file)
J. Serb. Chem. Soc. 64 (5- 6) 359-364 (1999)
UDC 547.867:546.215:547.295.72/546.226
JSCS-2676
Original scientific paper
Influence of sodium dodecyl sulfate
on the reaction between Nile Blue A and hydrogen peroxide
IVANA A. JANKOVIC, MIRA M. CAKAR* and JOVAN M. NEDELJKOVIC
Vinca Institute of Nuclear
Sciences, P.O.Box 522, YU-11001 Belgrade, and
*Faculty of Pharmacy, University of Belgrade, YU-11000 Belgrade,
Yugoslavia
(Received
25 November 1998, revised 5 February 1999)
The
influence of the anionic surfactant sodium dodecyl sulfate on the rate of the
reaction between the cationic form of Nile Blue A and hydrogen peroxide was
investigated in the pH range from 5 to 8.5. A retardation of the oxidation of
Nile Blue A with hydrogen peroxide of three orders of magnitude was observed at
pH 8.5 in the presence of anionic micelles compared to the kinetic data in
water. The retardation effect was less pronounced at lower pH values. These
effects were explained by the electrostatic interaction of the species involved
in the reaction with the negatively charged micellar surface and their
effective separation in the vicinity of the micellar surface.
Key
words: Nile Blue A, hydrogen peroxide, sodium dodecyl sulfate, micelles.
To download this article click here (384 KB WinZip file)
J. Serb. Chem. Soc. 64 (5- 6) 365-374 (1999)
UDC 546.41/.221:66.094.4:536.71
JSCS-2677
Original scientific paper
Thermodynamic analysis of copper(I)
sulfide chlorination by calcium chloride in the presence of oxygen
RAJKO Z. VRACAR and KATARINA P. CEROVIC
Faculty of Technology and
Metallurgy, University of Belgrade, Karnegijeva 4, P.O.Box 494, YU-11000
Belgrade, Yugoslavia
(Received
21 December 1998, revised 8 February 1999)
This
paper presents a thermodynamic analysis of possible, but insufficiently
studied, chemical reactions occurring during the chlorination of copper(I)
sulfide by calcium chloride in the presence of oxygen. It formed the basis for
assessing the probability and priority of their occurrence. Phase stability
diagrams have been plotted for the Cu-S-O-Cl system in the coordinates log p(S2)-log p(O2)-log p(Cl2) in the
temperature range from 473 to 773 K.
Key
words: thermodynamic analysis, Cu-S-O-Cl system, chlorination, calcium
chloride.
To download this article click here (458 KB WinZip file)
J.
Serb. Chem. Soc. 64 (5- 6) 375-380 (1999)
UDC 539.16:546.718'811'':661.635.66
JSCS-2678
Original scientific
paper
Influence of the radioactive
concentration of the in vitro stability of Tc-99m(Sn)-pyrophosphate
JURIJ L. VUCINA
Laboratory for Radioisotopes, Vinca
Institute of Nuclear Sciences, P.O.Box 522, YU-11001 Belgrade, Yugoslavia
(Received
18 December 1998)
The
in vitro stability of 99mTc(Sn)-pyrophosphate solution was
examined in dependence on the preparation conditions of the samples, the radioactive
concentration of 99mTc in the kit and the time elapsed after labeling. The samples
without any protection are highly unstable. The formation of 99mTc-pertechnetate
does not depend on the radioactive concentration. Nitrogen purging provides
protection in the case of low radioactive concentrations (37 MBq 99mTc/ml) but
exhibits no effect at higher concentrations. The best stabilization was
achieved by using ascorbic acid. A concentration of 60 µg/ml keeps the content
of 99mTc-pertechnetate below 1% during six hours after labeling, even in
solutions of high readioactive concentrations (740-814 MBq/ml). Gentisic acid
is less effective. Concentrations about ten times higher than required using
ascorbic acid are needed to keep the content of 99mTc-pertechnetate
below 5% during six hours.
Key
words: pyrophosphate, technetium-99m, ascorbic acid, gentisic acid, chemical
stabilization.
To download this article click here (304 KB WinZip file)
J. Serb. Chem. Soc. 64(5- 6)381-388(1999)
UDC 546.47'562''732''':541428.49:547.785,5
JSCS-2679
Original scientific paper
Complexes cobalt(II), zinc(II) and
copper(II) with some newly synthesized benzimidazole derivatives and their
antibacterial activity
S. O. PODUNAVAC-KUZMANOVIC, V. M. LEOVAC*, N. U. PERISIC-JANJIC*,
J. ROGAN** and J. BALAZ***
Faculty of Technology, Bul. Cara
Lazara 1, YU-21000 Novi Sad,
*Institute of Chemistry, Faculty of Science, Trg D. Obradovica 3,
YU-21000 Novi Sad,
**Department of General and Inorganic Chemistry, Faculty of
Technology and Metallurgy, Karnegijeva 4, P.O.Box 494, YU-11001 Belgrade and
***Faculty of Agriculture, Trg D. Obradovica 1, YU-21000 Novi Sad,
Yugoslavia
(Received
21 October 1998, revised 15 January 1999)
The
preparation and properties of some complexes of cobalt(II), zinc(II) and
copper(II) with several newly synthesized benzimidazole derivatives (L) are
reported. The complexes, of the general formula [MCl2L2]
(M=Co(II), Zn(II)) and [CuCl2L(H2O]), have a
tetrahedral structure. The complexes were characterized by elemental analysis,
molar conductivity, magnetic susceptibility measurements, IR and absorption
electronic spectra. The antibacterial activitiy of the benzimidazoles and their
complexes was evaluated against Erwinia carotovora subsp. carotovora
and Erwinia amylovora. The complexes were found to be more toxic than
the ligands.
Key
words: complexes, cobalt(II), zinc(II), copper(II), benzimidiazole
derivatives, physico-chemical characterization, biological activity.
To download this article click here (499 KB WinZip file)
J.
Serb. Chem. Soc. 64(5- 6)389-392(1999)
UDC 665.12:661.71:547.21
JSCS-2680
Note
N O T E
The
fatty acids and alkanes of Satureja adamovicii Silic and Satureja
fukarekii Silic
DUSANKA KITIC, RADOSAV PALIC*, NOVICA RISTIC** and GORDANA
STOJANOVIC*
Faculty of Occupational Safety,
Carnojevica 10a, YU-18000 Nis,
*Department of Chemistry, Faculty of Science, Cirila i Metodija 2,
YU-18000 Nis and
**Department of Chemistry, Faculty of Science, Vidovdanska b.b.
YU-38000 Pristina, Yugoslavia
(Received
30 October 1998, revised 4 February 1999)
The
content and composition of fatty acids and alkanes of Satureja adamovicii
Silic and Satureja fukarekii Silic were analized by GC. It was found
that unsaturated acids prevailed and that the major components were palmitic,
oleic, linoleic and linolenic acids. The hydrocarbon fractions of pentane
extracts were shown to consist of the alkane homologues (C17 to C34) with
nonacosane and hentriacontane being prevailing compounds.
Key
words: Satureja adamovicii Silic, Satureja fukarekii Silic, fatty acids,
hydrocarbons.
To download this article click here (289 KB WinZip file)
J.
Serb. Chem. Soc. 64(5- 6)393-396(1999)
UDC 547.92/.94:542.9
JSCS-2681
Note
N O T E
A
novel route to 3-hydroxy-16,17-seco-estrone derivatives
SUZANA S. JOVANOVIC-SANTA, VJERA M. PEJANOVIC* and JULIJANA A.
PETROVIC
Faculty of Science, University of
Novi Sad, Trg Dositeja Obradovica 3, YU-21000 Novi Sad, and
*ICN Yugoslavia, Institute, 29. Novembra 111, YU-11000 Belgrade,
Yugoslavia
(Received
14 May 1998, revised 16 February 1999)
Starting
from 3-benzyloxy-17-hydroxy-16,17-secoestra-1,3,5(10)-triene-16-nitrile (1b),
17-tosylate 2b and also 17-chloro-, 17-bromo- and 17-iodo-derivatives 4b,
5b, and 6b, were obtained. The fluoro-derivative 3b was
obtained from 2b in the reaction with tetrabutyl ammonium fluoride. The
deprotection of the 3-hydroxyl group was achieved by action of hydrogen in
presence of Pd/C as a catalyst, yielding six new 3-hydroxy-16,17-seco-estrone
derivatives.
Key
words: 3-hydroxy-16,17-seco-estrone derivatives, halogeno steroids,
hydrogenolysis.
To download this article click here (292 KB WinZip file)
Society Home Page
Contents of this Vol. Journal Home Page
Copyright & copy; SHD 1999.
Last
Updated June 2, 1999
For
more information contact: SHD@elab.tmf.bg.ac.yu