J. Serb. chem.
Soc. 63(5) 319-347 (1998)
UDC 546.718:622.23
JSCS-2537
Review paper
REVIEW
Technetium-99m
production: Available options and future prospects
JURIJ
L. VUCINA
Laboratory for
Radioisotopes, Vinca Institute of
Nuclear Sciences, P.O.Box 522, 11001 Belgrade, Yugoslavia
(Received 23 December 1997)
1. Introduction
2. Discovery of technetium
3. Production of molybdenum-99
3.1.
Neutron activation of stable molybdenum
3.2. Molybdenum-99 by uranium fission
3.3. Alternative technologies for the production
of molybdenum-99
4. Separation
methods applied in
Mo-99/Tc-99m generators
4.1.
General requirements
4.2. Chromatography
4.3. Sublimation
4.4. Solvent extraction
4.5. Gel elution
5. Discussion
6. Conclusion
Key words:
technetium-99m, molybdenum-99, fission, neutron activation, molybdenum-99/technetium-99m generators.
J. Serb. Chem.
Soc. 63(5)349-358(1998)
UDC 536.71/.722:541.122.2
JSCS-2538
Original scientific
paper
The applicability
of the Ohta
approach to vapour-liquid equilibria and liquid excess enthalpy
calculations using the PRSV EOS with the Wong-Sandler mixing rules
ZORAN
P. VISAK, BOJAN D. DJORDJEVIC, ZORAN M. DJURISIC, JELENA M. JELIC,
ALEKSANDAR Z. TASIC and SLOBODAN P. SERBANOVIC
Faculty of
Technology and Metallurgy, Karnegijeva 4, P.O.Box
3503, YU-11120 Belgrade, Yugoslavia
(Received 1 December 1997)
The Peng-Robinson-Stryjek-Vera equation of state (PRSV EOS), coupled with the
Wong-Sandler mixing rules (WS), was employed to correlate the vapour-liquid equilibria (VLE) and liquid molar excess
enthalpy (HE) data of ten binary systems exhibiting various complexities (asymmetric systems, systems with polar and
associated components, etc.). In the WS mixing rule the
NRTL qeuation was incorporated, vhereby the nonrandomness parameter a12 and the second virial
coefficient binary interaction parameter k12 were
treated as constants. The Ohta approach
was used for the generation
of the parameters
t12 and
t21 in the
VLE and HE calculations.
The obtained VLE results can, in most cases, be considered very good, whereas
the HE results may be generally regarded as acceptable.
Key words:
vapour-liquid equilibria,
liquid excess enthalpy, cubic equations of state,
mixing rules, binary mixtures
J. Serb. Chem.
Soc. 63(5)359-365(1998)
UDC 547.391.1:547.631.2/547.556.7/
JSCS-2539
Original scientific
paper
Reactivity of
b-aroylacrylic acids with diazodiphenylmethane
LJ.
S. STEVOVIC, B. J. DRAKULIC*, I. O. JURANIC**, S. Z. DRMANIC*** and B. Z. JOVANOVIC***
INOTEH-Belgrade,
*Center for Chemistry
ICTM, Belgrade,
**Faculty of Chemistry,
University of Belgrade and
***Faculty of Technology
and Metallurgy, University of Belgrade,
Yugoslavia
(Received 11 December 1997, revised 15 January 1998)
The rate constants for 10 trans-substituted b-aroylacrylic acids in their reaction with diazodiphenylmethane
(DDM) were determined in ethanol at 30 °C. The intention was to study the transmission
of electronic effects of substituents
on the phenyl nuclei to the carboxylic
group reaction center, through the -C(=O)-CH=CH-group. The obtained rate constants were analyzed with the
classical Hammett equation and the
extended Hammett and Taft equation.
It was possible,
using Taft's relationship, to effect the separation of the overall
polar effect into inductive and resonance components.
The pattern of transmission through the observed
conjugated system has been discussed.
Conformational variations caused by variable
substituents in an aromatic ring were calculated using the MNDO-AM1 semiempirical method. The inclusion
of a calculated conformational effect considerably improves the regression.
Key words:
b-aroylacrylic acids, diazodiphenylmethane, Hammett equation.
J. Serb. Chem.
Soc. 63(5)367-370(1998)
UDC 547,587.51
JSCS-2540
Original scientific
paper
Chemical behaviour of 3-(2-formyl-1-chlorovinyl)coumarin
towards some different bases
IBRAHIM
M. EL-DEEN
Faculty of
Education, Suez Canal University, Port-Said, Egypt
(Received 4 December 1997)
Rections of
3-(2-formyl-1-chlorovinyl)coumarin with sodium hydroxide,
methoxide, triethyl amine and piperidine are described.
Key words:
3-(2-formyl-1-chlorovinyl)coumarin, reacting with bases.
J. Serb. Chem.
Soc. 63(5)371-377(1998)
UDC 547.736
JSCS-2541
Original scientific
paper
A comparative study of the
reactions of
thiophene-2-carboxanilides and related
compounds
RAGAB
A. EL-SAYED
Chemistry Department, Faculty of Science,
Al Azhar University, Nasr City, Cairo,
Egypt
(Received 8 December 1997)
The p-chloro, p-bromo derivatives of
thiophene-2-carboxanilide react with
chlo-rosulfonic acid to give the corresponding
sulfonyl chlorides
1,16,31, which react with some nucleophilic reagents to give the amino acid
derivatives 2-6, 17-21, and
32-36. Some of the corresponding methyl esters 7-9, 22-24 and 37-39
were prepared. Hydrazinolysis of these methyl esters
yielded the hydrazides 10-12, 25-27 and
40-42. Coupling reactions
of some amino acid derivatives with amino acid
methyl ester hydrochloride in THF-Et3N medium, using the dicyclohexylcarbodiimide
DCC-method, gave the desired dipeptide
methyl esters 13-15,
28-30 and 43-45. The
spectral data of the compounds are briefly discussed.
Key words:
thiophene-2-carboxanilides, p-chloro, p-bromo derivatives, amino acids.
J. Serb. Chem
.Soc. 63(5)379-385(1998)
JSCS-2542
UDC 547.756/547.85
541.428.49/546 47' 562'' 742'''/
Original scientific
paper
Study of
N1-[5-nitro-2-furfurylidene]-N2-[b-isatin]azine and its
Zn(II), Cu(II) and Ni(II) complexes
B.
C. STOJCEVA RADOVANOVIC and S. S. ANDJELKOVIC*
Department of Chemistry, Faculty of Science, Cirila
i Metodija 2, YU-18000 Nis and
*Faculty of Technology,
Bulevar oslobodjenja 124, YU-16000 Leskovac, Yugoslavia
(Received 19 March 1997, revised 19 January 1998)
Coordination compounds
of Zn(II), Cu(II) and Ni(II) with N1-[5-nitro-furfurylidene]-N2-[b-isatin]azine were prepared.
Their structure were established to be [ZnLCl2]·H2O, [CuLCl2]·H2O and
[NiL2Cl2]·2H2O using
elemental analysis, as well as, AA, molar conductance, magnetic susceptibility, FTIR, UV/VIS and 1H-NMR spectroscopic methods. The central ions,
zinc and copper are in a tetrahedral, while nickel is in a octahedral environment. The spectral studies
indicated complexation through the nitrogen and oxygen atom of the isatin
part of the
ligand. The coordination compounds were tested for
antibacterial activity against Staphylococcus aureus, Enterococcus
D, Proteus vulgaris and
Escherichia coli.
Key words:
azine, Zn(II), Cu(II) and Ni(II) complexes, spectral characterization, antibacterial activity.
J. Serb. Chem.
Soc. 63(5)387-393(1998)
UDC 661.635.41+661.843:541.133.1
JSCS-2543
Original scientific paper
On the mechanism of strontium
incorporation into calcium phosphates
ZIVORAD
VUKOVIC, SLAVICA LAZIC, IVANA TUTUNOVIC and SLAVICA
RAICEVIC
Vinca Insttitute of Nuclear Sciences,
P. O. Box 522, YU-11001 Belgrade,
Yugoslavia
(Received 30 July 1997, revised 27 January 1998)
The results
of coprecipitation and sorption of
strontium by amorphous and crystalline
hydroxyapatite are presented.
Coprecipitation experiments,
performed over a wide range of
experimental conditions, have confirmed that strontium is incorporated into hydroxyapatite by the isomorphous substitution of calcium. Adsorption on the surface of
well crystallized hydroxyapatite follows a Langmuir adsorption isotherm with a monolayer capacity of 1.5×10-4 mol g-1.
Key words:
hydroxyapatite, strontium,
coprecipitation, sorption.
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