JSCS Vol 67, No. 11
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Impresum |
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J.Serb.Chem.Soc.
67(11)709–718(2002) |
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Monoazo disperse dyes based on
2-amino-1,3,4-thiadiazole derivatives
HARI R. MARADIYA
V. P. and R. P. T. P. Science
College, Vallabh Vidyanagar 388 120, Gujarat State, India
(Received
20 November 2001, revised 27 July 2002)
A
series of monoazo disperse dyes based on 2-amino-5-mercapto-1,3,4-thiadiazole
was prepared by coupling with various N-arylmaleimides. The dyeing performance
of these dyes was assessed on nylon fabric. The dyes were found to give yellow
to brown colour shades on dyeing with good depth and levelness on nylon fabric.
The dyebath exhaustion, fixation and fastness properties of the dyes were also
determined. The dyed fabric showed moderate to good light fastness and very
good to excellent fastness to washing, rubbing, perspiration and sublimation.
The IR and visible range spectral properties of the dyes were also determined.
Keywords:
2-amino-5-mercapto-1,3,4-thiadiazole,N-arylmaleimides, disperse dyes,
dyeing,fixation, fastness.
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J.Serb.Chem.Soc.
67(11)719–726(2002) |
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Disperse dyes based on
2-methyl-3-[3’-aminophthalimido]-4(3H)-quinazolinone
VIJAYH. PATEL, MANISH P. PATEL and RANJAN G. PATEL
Department of Chemistry, Sardar
Patel University, Vallabh Vidyanagar-388 120, Gujarat, India
(Received
10 January, revised 27 July 2002)
A
series of new heterocyclic disperse dyes has been prepared by subsequent
diazotization of 2-methyl-3-[3’-aminophthalimido]-4(3H)-quinazolinone
and coupling with various mono- and di-N-substituted derivatives of aniline.
All the disperse dyes were characterized by their percentage yield, melting
point,UV-visible spectrum, elemental analysis, infrared spectrum and dyeing
performance on nylon 66 and polyester fibres. The percentage dye bath
exhaustion on different fibres was found to be reasonably good and acceptable.
The dyed fibres showed fair to fairly good to good fastness to light and very good
to excellent fastness to washing, rubbing, perspiration and sublimation.
Keywords:
3’-aminophthalimido; quinazolinone; synthesis; nylon 66 fibres; polyester
fibres; dyeing properties.
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J.Serb.Chem.Soc.
67(11)727–734(2002) |
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Synthesis and application of novel
heterocyclic dyes based on 11-amino-13H-acenaphtho[1,2-e]pyridazino[3,2-b]quinazolin-13-one
VIJAYH. PATEL, MANISH P. PATEL and RANJAN G. PATEL
Department of Chemistry, Sardar
Patel University, Vallabh Vidyanagar-388 120, Gujarat, India
(Received
10 January, revised 26 July 2002)
A
new fused heterocyclic compound, 11-amino-13H-acenaphtho[1,2-e]pyridazino
[3,2-b]quinazolin-13-one was synthesized and used to prepare a novel
series of heterocyclic mono azo dyes by coupling with various naphthols. All
the mono azo dyes were characterized by their melting point, elemental
analysis,UV-visible spectrum, infrared spectrum and dyeing performance on nylon
and polyester fibres. The percentage dye bath exhaustion on different fibres
was found to be reasonably good and acceptable. The dyed fibres show fair to
good fastness to light and very good to excellent fastness to washing, rubbing,
perspiration and sublimation.
Keywords:
11-Amino-13H-acenaphtho[1,2-e]pyridazino[3,2-b]quinazolin-13-one, synthesis,
nylon fibres, polyester fibres, dyeing properties.
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J.Serb.Chem.Soc.
67(11)735–744(2002) |
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Computational study of the
chromatographic enantioseparation of tris(acetylacetonato)cobalt(III) complexes
on an arginine complex of cobalt(III) acting as a chiral selector
LJILJANA CUCKOVIC, ISMET M. HODZIC and SVETOZAR R. NIKETIC*
Chemistry Department, Faculty of
Science, University of Belgrade, Studentski trg 16. P. O. Box 158, YU-11001
Belgrade, Yugoslavia and
*Department of Chemistry, University of Fribourg, Pérolles,
CH-1700 Fribourg, Switzerland
(Received
28 June 2002)
Acomputational
procedure for the modelling of chromatographic separation of neutral
tris(acetylacetonato)cobalt(III) into enantiomers on a
dinitrobis(arginine)cobalt(III) complex as a chiral selector is described.
Predicted elution order calculated from the differences in total energy of
interaction for L and D selectands is in agreement with the experimental results.
Predictive power of the method and its possible practical applications in
designing efficient
chiral
stationary phases is demonstrated.
Keywords:
Co(III) complexes, chromatographic enantioseparation, molecular mechanics,
computational modelling, chirality.
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J.Serb.Chem.Soc.
67(11)745–751(2002) |
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Factorial design in isocratic
high-performance liquid chromatography of phenolic compounds
ANTONIJE ONJIA, TATJANA VASILJEVIC*, DJURO COKESA and MILA
LAUSEVIC*
The Vinca Institute of Nuclear
Sciences, P. O. Box 522, YU-11001 Belgrade and
*Faculty of Technology and Metallurgy, P. O. Box 494, YU-11001
Beograde, Yugoslavia
A
multifactor optimization strategy was utilized to predict the isocratic HPLC
separation of nine phenols. The retention behavior was studied as a function of
changing
eluent (methanol – acetic acid) composition. The predicted and measured
retentions are in rather good agreement. To locate the optimum in the factor
space, the normalized resolution product criterion was applied. In virtually
every case, the resolution is limited by the separation of the 2-chlorophenol
and 2,4-dinitrophenol pair.
Keywords:
factorial design, phenols, HPLC, resolution product, isocratic.
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J.Serb.Chem.Soc.67(11)753–760(2002) |
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The effects of the fine grinding on
the physicochemical properties and thermal behavior of bentonite clay
LEPOSAVA FILIPOVIC-PETROVIC, LJILJANA KOSTIC-GVOZDENOVIC* and
STANKA ERIC-ANTONI
Zorka-Research Center, Narodnih
heroja bb, YU-15000 Sabac and
*Faculty of Technology and Metallurgy, University of Belgrade,
Karnegijeva 4, YU-11000 Belgrade, Yugoslavia
(Received
20 February, revised 14 August 2002)
In
this study, the results obtained by the mechanical treatment of bentonite clay
Zavidinci, Serbia in a laboratory vibration mill with rings for different
periods of time are presented. The successive structural changes of the
minerals were studied by X-ray diffraction analysis, DTA analysis, IR
spectroscopy and particle size distribution. The reactivity changes were
controlled by CEC. The starting material and the material mechanically treated
for 30 min were sintered at several temperature and for different time periods
examined by X-ray diffraction. Mechanical treatment by fine grinding of
bentonite clay produces structural changes of the powdered material and
influences its behavior in further processing steps in particular after thermal
treatment.
Keywords:
bentonite clay, grinding, properties.
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J.Serb.Chem.Soc.
67(11)761–768(2002) |
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A TPD-MS study of glassy carbon
surfaces oxidized by CO2 and O2
ALEKSANDRA A. PERIC-GRUJIC, OLIVERA M. NESKOVIC*, MIOMIR V.
VELJKOVIC*, MILA D. LAUSEVIC and ZORAN V. LAUSEVIC*
Faculty of Technology and
Metallurgy, University of Belgrade, Karnegijeva 4, YU-11000 Belgrade and
*Vinca Institute of Nuclear Sciences, P. O. Box 522, YU-11001
Belgrade, Yugoslavia
(Received
16 May, revised 10 July 2002)
The
temperature-programmed desorption (TPD) method combined with mass spectrometric
(MS) analysis has been applied to investigate the surface properties of carbon
materials. The apparatus consisting of a temperature-programmed furnace and a
quadrupole mass spectrometer was constructed in order to characterize the
surface of differently treated glassy carbon samples. In this work, samples of
glassy carbon exposed to air, CO2 and O2 were
examined. The desorption of H2O, CO and
CO2, as major products, indicated the presence of different oxide
groups. The amount of these groups for all samples was calculated. It is
concluded that oxidation affects the nature and the amount of the surface oxide
groups and contributes to their increased stability,
Keywords:
glassy carbon, oxidation, mass spectra, temperature-programmed desorption.
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J.Serb.Chem.Soc.
67(11)769–775(2002) |
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The estimation of solid copper
surface tension in copper sulfate solutions
K. I. POPOV, N. D. NIKOLIC* and Z. RAKOCEVIC**
Faculty of Technology and
Metallurgy, Karnegijeva 4, Belgrade,
*ICTM-Institute of Electrochemistry, Njegoseva 12, Belgrade and
**Vinca Institute of Nuclear Sciences, Belgrade, Yugoslavia
(Received
1 July 2002)
In
metal electrodeposition in the limiting diffusion current density range, the
deposition current density remains constant regardless of the deposition
overpotential used. At the same time, the larger the deposition overpotential
is the more disperse is the formed deposit, which is characterised by an
increased specific surface. The difference in the specific surface of disperse
deposits obtained at two different overpotentials in the limiting diffusion
current density range is correlated with the difference between the deposition
overpotentials.Amethod for the estimation of the surface tension of solid copper
in copper sulfate solutions is also proposed.
Keywords:
interfacial energy copper-copper sulfate solution, specific surface of
copper powder.
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J.Serb.Chem.Soc.
67(11)777–782(2002) |
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PRELIMINARY COMMUNICATION
Dissolution
of chromium in sulfuric acid
D. M. DRAZIC and J. P. POPIC
Institute of Chemistry, Technology
and Metallurgy - Center for Electrochemistry, Njegoseva 12, P. O. Box 815,
YU-11001 Belgrade, Yugoslavia
(Received
8 August 2002)
By
combining electrochemical corrosion rate measurements and spectrophotometric
analysis of the electrolyte it was shown that at room temperature chromium
dissolves in deaerated 0.1 M Na2SO4 + H2SO4 (pH 1)
solution as Cr(II) and Cr(III) ions in he ratio Cr(II) : Cr(III) @ 7 : 1.
This process was stable over 4 h without any detectable change. The total
corrosion rate of chromium calculated from the analytical data is about 12
times higher, than that determined electrochemically by cathodic Tafel line
extrapolation to the corrosion potential. This finding was confirmed by
applying the weight-loss method for the determination of the corrosion rate.
This enormous difference between these experimentally determined corrosion
rates can be explained by the rather fast, “anomalous” dissolution process
proposed by Kolotyrkin and coworkers (chemical reaction of Cr with H2O
molecules) occurring simultaneously with the electrochemical corrosion process.
Keywords:
chromium, corrosion, acid solutions, corrosion products, anomalous
dissolution.
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J.Serb.Chem.Soc.
67(11)783–792(2002) |
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A kinetic determination of lysine
in pharmaceutical sample
S. S. MITIC, G. Z. MILETIC, A. N. PETROVIC and S. B. TOSIC
Faculty of Sciences and
Mathematics, Department of Chemistry, University of Nis, Visegradska 33, P. O.
Box 224, YU-18000 Nis, Yugoslavia
(Received
17 May, revised 16 June 2002)
Akinetic
method for the determination of micro quantities of the amino acid lysine (Lys)
is described in this paper. The catalytic activity of cobalt in the reaction of
the oxidation of purpurin (1,2,4-trihydroxyanthraquinone, PP) by hydrogen
peroxide in alkaline buffer solution decreases in the presence of micro quantities
of lysine, because of the formation of a complex. The experimental conditions
for the successful determination of lysine were optimized. The relative error
ranges from 7.7 to 1.9% in the concentration range from 0.118 to 23.520 mg cm-3. The
detection limit is 0.023 mg cm-3. Kinetic equations are proposed for the investigated process. The
effects of certain foreign ions and amino acids on the reaction rate were
determined in order to assess the selectivity of the method. The method was
applied to the determination of lysine in a pharmaceutical sample Riborn-P
(Medecon–Belgrade).
Keywords:
kinetic method, lysine, purpurin oxidation, pharmaceutical sample.
Copyright & copy; SHD 2002.
Last
Updated November 29, 2002.
For
more information contact: SHD@elab.tmf.bg.ac.yu