JSCS Vol 69, No. 3
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J. Serb. Chem.
Soc. 69(3)175–178(2004) |
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Stereoselective synthesis of (E)-vinyl alkyl sulfides via hydrozirconation of
terminal alkynes
PING ZHONG*.** and XIAN HUANG**
*Department of
Chemistry, Wenzhou Normal College, Wenzhou 325027, P. R. China and
*Department of Chemistry, Zhejiang University, Hangzhou 310028, P. R. China
(e-mail: zhongp0512@sina.com.cn)
(Received 15 July,
revised 3 November 2003)
Terminal alkynes react with Cp2Zr(H)Cl
(Cp = h5-C5H5) to give organozirconium complexes,
which are trapped with alkylsulfenyl chlorides to afford (E)-vinyl alkyl
sulfides in good yield.
Keywords: alkyne, sulfide, alkylsulfenyl chloride, hydrozirconation,
synthesis.
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J.Serb.Chem.Soc.
69(3)179–185(2004) |
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The structure directing role of 1,3-diAMinopropane in the
hydrothermal synthesis of iron(III) phosphate
NEVENKA RAJIC, DJORDJE STOJAKOVIC, DARKO HANZEL*
and VENČESLAV KAUČIČ**,***
Faculty of Technology and Metallurgy, University of Belgrade, 11000 Belgrade,
Serbia and Montenegro (e-mail address: nena@elab.tmf.bg.ac.yu),
*Institute Jo`ef [tefan, 1000 Ljubljana, Slovenia,
**National Institute of Chemistry, 1000 Ljubljana, Slovenia and
***University of Ljubljana, 1000 Ljubljana, Slovenia
(Received 6 October
2003)
1,3-DiAMinopropane (DAP) was used as a
structure-directing agent for the hydrothermal synthesis of an organically
templated iron phosphate. During crystallization at 180 ºC, iron phosphate
(FePO-DAP) with a layered structure was formed after one day. Longer
crystallization yielded a mixture of FePO-DAP and leucophosphite, raising the
question whether a transformation of FePO-DAP to leucophosphite occurs, or
wheter DAP decomposes under hydrothermal conditions resulting in leucophosphite
formation. Lattice energy and free energy calculations strongly support the
supposition that a decomposition of DAP occurs prior to the formation of
leucophosphite.
Keywords: FePO, iron phosphate, hydrothermal
synthesis, GULP, open-frAMework.
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J.Serb.Chem.Soc.
69(3)187–193(2004) |
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The preparation and characterization of Cu(II) complexes with N,N’,N”,N’”-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane
and 2,6-diacetylpyridine bis(semi/thiosemicarbazones)
SLADJANA B. TANASKOVIC and GORDANA VUCKOVIC*
Faculty of Pharmacy,
University of Belgrade, Vojvode Stepe 450, 11000 Belgrade and
*Faculty of Chemistry, University of Belgrade, P. O. Box 158, 11001 Belgrade,
Serbia and Montenegro (e-mail: gordanav@helix.chem.bg.ac.yu)
(Received 24 April,
revised 13 October 2003)
Two new Cu(II) mixed-ligand complexes with octadentate N,N’,N”,N’”-tetrakis(2-pyridylmethyl))-1,4,8,11-tetraazacyclotetradecane
(tpmc) and potentially pentadentate ligands 2,6-diacetylpyridine
bis(semicarbazone) (DAPsc2) or 2,6-diacetylpyridine
bis(thiosemicarbazone) (DAPtsc2) were prepared. The general
formulas: [Cu4 DAPsc2(tpmc)2]ClO4)8·5CH3COCH3·H2O
and [Cu2 DAPtsc2(tpmc)](ClO4)4·7C2H5OH
were proposed on the basis of elemental analyses and conductometric
measurements. The complexes were characterized by magnetic measurement,
electronic absorption and IR spectroscopy. For the dinuclear complex, an exo
coordination of Cu(II) with four nitrogens from tpmc and m-bonded DAPtsc2
through sulfurs and possibly terminal hydrazinic (azomethine) nitrogens is
assumed. For the tetranuclear complex, it is supposed that one DAPsc2
bridges two [Cu2 tpmc]4+ units using oxygens and terminal
hydrazinic nitrogens as ligators. Finally, some antibacterial activity of the
complexes was found.
Keywords: Cu(II) complexes,
N,N’,N”,N’”-tetrakis(2-pyridylmethyl))-1,4,8,11-tetraazacyclotetradecane (tpmc),
2,6-diacetylpyridine bis(semicarbazone), 2,6-diacetylpyridine
bis(thiosemicarbazone), antibacterial activity.
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J.Serb.Chem.Soc.
69(3)195–204(2004) |
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Spectroscopic, magnetic and thermal behaviour of
the 2,3,4-trimethoxybenzoates of heavy lanthanides(III) and
yttrium(III)
WIESŁAWA FERENC, BEATA BOCIAN and AGNIESZKA
WALKÓW-DZIEWULSKA
Department of General
Chemistry, Faculty of Chemistry, Maria Curie-Sk»odowska University, Pl 20-031,
Lublin, Poland
(e-mail: wetafer@hermes.umcs.lublin.pl)
(Received 28 July,
revised 10 October 2003)
The complexes of 2,3,4-trimethoxybenzoic acid
with Tb(III), Dy(III), Ho(III), Er(III), Tm(III), Yb(III), Lu(III) and Y(III)
are crystalline, anhydrous salts with colours typical of the M(III) ions. The
carboxylate group is probably a bidenate, chelating ligand. The thermal
stabilities of the complexes were exAMined under an air atmosphere in the
temperature range 293–1273 K. The solubility in water at 293 K for all the
heavy lanthanide(III) and yttrium(III) complexes are in the order of 10-3
mol dm-3. The magnetic moments of the complexes were determined in
the temperature range 77–300 K.
Keywords: heavy lanthanides(III), yttrium(III), thermal stability, IR
spectra, complexes of 2,3,4-trimethoxybenzoic acid, magnetic moments.
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J.Serb.Chem.Soc.
69(3)205–223(2004) |
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Geochemistry of the Cretaceous-Tertiary
transition boundary at Blake Nose (N.W. Atlantic): Cosmogenic Ni
PAVLE I. PREMOVIC, NIKOLA D. NIKOLIC, MIRJANA S. PAVLOVIC* and KATJA I. PANOV
Laboratory for Geochemistry, Cosmochemistry &AMp; Astrochemistry,
University of Nis, P. O. Box 91, 18000 Nis and
*Vinca Institute of Nuclear Sciences, P. O. Box 522, 11001 Belgrade, Serbia and
Montenegro (e-mail: asteroid_2000_2000@yahoo.com)
(Received 17 October
2003)
The Cretaceous-Tertiary
(KT) boundary transition at the Blake Nose Plateau recovered by ODP Leg 171B
(site 1049, hole A, core 17X, section 2) contains an ejecta bed (thickness ca.
17 cm) marking a late Cretaceous asteroid impact. The nature and geochemical
composition of this bed imply that it originated mainly from the target rocks
of the Chicxulub impact site (Yucatan Peninsula, Mexico), the site of the
presumed asteroid impact. The ejecta bed of hole 1049A contains relatively high
concentrations of Ni (up to 165 ppm) within the carbonate fraction. It is
reasoned that this enhancement represents a sudden and rapid airfall of high
cosmogenic Ni into he Blake Nose Basin. The source of the metal was the
Chicxulub impacting (carbonaceous) chondrite. It is suggested that many
calcareous planktons in the KT ocean surface water of the Blake Nose Plateau
were probably vulnerable to the high influx of superacid rainfall and
associated toxic metals (e.g., Ni) created by the impact.
Keywords: nickel, Cretaceous-Tertiary boundary, ODP, Blake Nose Plateau.
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J.Serb.Chem.Soc.
69(3)225–231(2004) |
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The effects of b-cyclodextrin and pH on
bifonazole hydrosolubility
GORDANA POPOVIC and MIRA CAKAR
Faculty of Pharmacy,
University of Belgrade, P.O. Box 146, Vojvode Stepe 450, 11000 Belgrade, Serbia
and Montenegro
(e-mail: gpopovic@pharmacy.bg.ac.yu)
(Received 1 August,
revised 4 November 2003)
The equlibria of bifonazole in saturated water
solution within the pH range 4 to 10 [I = 0.1 mol/dm3 (NaCl); 25 ºC]
were studied spectrophotometrically. Based on the equlibrium constants
determined in a heterogeneous system, the acidity constant (pKa = 5.72) and
solubility in water (S = 10-5.79 + 10-(pH + 0.07) were
calculated. The influence of b-cyclodextrin on
bifonazole solubility was exAMined in the presence of 10-3 and 10-4
mol/dm3 b-cyclodextrin. At pH
values over 8, bifonazole solubility was two- and 13-fold increased in the
presence of 10-4 and 10-3 mol/dm3 b-cyclodextrin, respectively, compared to its solubility in water.
The ratio of bifonazole solubility in the presence of b-cyclodextrin and that in water decreased in parallel to the
increase of acidity.
Keywords: bifonazole, acidity constant, solubility, b-cyclodextrin.
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J.Serb.Chem.Soc.
69(3)233–237(2004) |
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N O T E
Saturated-liquid heat
capacity of organic compounds: new empirical correlation model
JOVAN D. JOVANOVIC and DUSAN K. GROZDANIC
Faculty of Technology
and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia
and Montenegro
(Received 6 August,
revised 3 November 2003)
A new saturated-liquid heat capacity model is
recommended. This model is tested and compared with the known polynomial and
quasi-polynomial models on 39 sets with 1453 experimental heat capacity data.
The obtained results indicate that the new model is better then the existing
models, especially near the critical point.
Keywords: heat capacity, saturated liquid, correlation.
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J.Serb.Chem.Soc.
69(3)239–249(2004) |
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The influence of the deposition parAMeters on
the porosity of thin alumina films on steel
MARIJA S. LAZIC, KORNELIJA SIMOVIC*, VESNA B.
MISKOVIC-STANKOVIC**, PREDRAG JOVANIC and DUSAN KICEVIC*
Institute of Nuclear and
Other Mineral Raw Materials, Franchet d’ Esperey 86, 11000 Belgrade,
*Vinca Institute of Nuclear Sciences, Materials Science Laboratory, P. O. Box
522, 11001 Belgrade and
**Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4,
P. O. Box 3503, 11120 Belgrade,
Serbia and Montenegro (e-mail: vesna@elab.tmf.bg.ac.yu)
(Received 29 July,
revised 11 November 2003)
The influence of the deposition parAMeters on
the porosity of thin alumina films electrophoretically deposited on steel from
aqueous suspensions was investigated. The effects of the applied voltage,
deposition time, suspension temperature and the solid content of the aqueous
suspension on the porosity of the obtained alumina films have been determined
using optical microscopy coupled with image analysis. It was shown that the
lowest film porosity was obtained from a suspension containing 20 wt.% alumina
powder at the lowest applied voltage (30 V), for a longer deposition time (10
min) using a suspension temperature of 30 ºC. This behavior can be explained by
the smaller AMount of hydrogen evolved on the cathode during the
electrophoretic deposition process.
Keywords: alumina, cataphoretic deposition, deposition parAMeters, image
analysis, porosity.
Copyright &AMp; copy; SHD 2004.
March 23, 2004.
For
more information contact: SHD@tmf.bg.ac.yu