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PL ISSN 0137-5083

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Volume 71 Number 7 July 1997
Pages 849-1035

 
   


Polish Chemical Society 

   

CONTENTS


Page

REVIEW ARTICLE
849 Alkylation of Carbonyl Compounds through Conversion into Oxycyclopropane Intermediates
— Kulinkovich O.G.
INORGANIC CHEMISTRY
883 Influence of Bridging Function of Non-Linear Pseudohalides on Magnetism of Their Metal Complexes
— Mrozinski J., Kohout J. and Hvastijova M.
889 Syntheses and Properties of µ-2-Bromoterephthalato Manganese(II) Binuclear Complexes
— Shi J.M., Liao D.Z., Cui J.Z., Jiang Z.H. and Wang G.L.
893 The CuGaSe2-CdSe Section of the Quasiternary Cu2Se-CdSe- Ga2Se3 System
— Olekseyuk I.D., Kadykalo E.M. and Zmiy O.F.
898 Phase Equilibria in the V2O5-Fe2WO6 System
— Walczak J., Rychlowska-Himmel I. and Blonska-Tabero A.
ORGANIC CHEMISTRY
903 Peptide Synthesis with the Use of N,N'-Dicyclopentylcarbodiimide
— Izdebski J., Orlowska A., Pachulska M. and Witkowska E.
908 3,3-Diarylphthalides. Part I. Friedlaender Reaction of 3'-Alkylphenolphthaleins
— Ruminski J.K.
915 Design and Synthesis of New Bradykinin Antagonists with N-Terminal Acylation
— Prahl A., Wierzba T., Wszedybyl M., Juzwa W. and Lammek B.
923 Synthesis and Antibacterial Activity of Novel 1-Butyl-2-phenoxy/2-Phenylthio/2-Amino-
methyl-5- methoxyindole Derivatives

— Gadaginamath G.S. and Patil S.A.
929 Antagonists of Bradykinin Modified with Conformationally Restricted Dipeptide Fragment
— Prahl A., Wierzba T., Winklewski P., Musial P., Juzwa W. and Lammek B.
936 From Sugar Allyltins to Chiral Cyclopentadienes: Radical Cyclization of Highly Oxygenated Sugar-Derived Dienoaldehydes
— Mach M. and Jarosz S.
941 Zinc Chloride Catalyzed Ring Opening of 3-Mono- and 3,3-Disubstituted Glycidonitriles by Means of Acetyl Chloride
— Zdrojewski T., Fedorynski M. and Jonczyk A.
947 Pentad Distribution of Acrylic Copolymers by 13C NMR Spectroscopy
— Matlengiewicz M.
955 Polymerization of Propylene Oxide on Anatase Surface
— Chernyavskaya T.V., Brei V.V., Grebenyuk A.G., Dzyubenko L.S. and Chuiko A.A.
PHYSICAL CHEMISTRY
962 Influence of Na+ Ions on the Specific Surface Area of MgO Catalysts and Their Activity in Oxidative Coupling of Methane
— Ignaczak W., Jozwiak W.K., Gebauer D.T. and Paryjczak T.
968 Selected Problems Related to Polymeric Electrolytes from the PEO-H3PO4 System
— Przyluski J., Zalewska A., Maron J. and Wieczorek W.
977 Effect of Addition of LiCl on Reaction Rates in Dehydrocoupling of Hydrosilanes with
Hydroxyl Containing Nucleophiles, in DMF Catalyzed by ZnCl2

— Chrusciel J.
986 Osmium(VIII) Catalyzed Oxidation of Allyl Alcohol by N-Bromosuccinimide in Aqueous
Alkaline Medium

— Chougale R.B., Kamble D.L. and Nandibewoor S.T.
992 Transport Properties of Nonstoichiometric Manganous Sulphide
— Mrowec S., Danielewski M. and Wojtowicz A.
CRYSTAL AND MOLECULAR STRUCTURES
1005 The Structure of 3-[4-(4-Phenylpiperazine)butyl]-5,5-diisopropylhydantoin - New Ligand of Serotonin Receptors
— Wolska I., Byrtus H. and Zejc A.
1012 Bicyclic [b]-Heteroannelated Pyridazine Derivatives. 7. Structure of O-benzyl-8-phenyl-3- trifluoromethyl-triazolo[4,3-b]pyridazine-6(5H)-ones
— Karolak-Wojciechowska J., Lange J. and Trzezwinska H.B.
1020 Structure and Magnetism of Nickel(II) Dimer with Thiourea Bridges
— Melnik M., Sramko T., Dunaj-Jurco M., Jorik V., Kalinska B. and Mrozinski J.
COMMUNICATIONS
1029 An Expedient Differentiation between Substituted 1,3-Oxazolane and 1,3-Dioxane Moieties by Mass Spectrometry
— Achmatowicz O., Baranowska E. and Szechner B.
1032 IUPAC Recommendations on Nomenclature and Symbols.


ABSTRACTS


849-
882

Alkylation of Carbonyl Compounds through
Conversion into Oxycyclopropane Intermediates

by O.G. Kulinkovich
Department of Chemistry, Belarusian State University, Fr. Skariny Av. 4, Minsk, 220050, Belarus

(Received December 31st, 1996; revised manuscript February 24th, 1997)

Alkylation of carbonyl compounds through their conversion into the corresponding oxycyclopropane intermediates followed by a three-carbon atom ring cleavage is reviewed.

883
-888

Influence of Bridging Function of Non-Linear
Pseudohalides on Magnetism of Their Metal Complexes

by J. Mrozinski1, J. Kohout2 and M. Hvastijova2
1Faculty of Chemistry, University of Wroclaw, 50-383 Wroclaw, Poland
2Department of Inorganic Chemistry, Slovak Technical University, 812-37 Bratislava, Slovakia

(Received February 20th, 1997)

Temperature-dependent magnetic properties (4.2-300 K) of a series of pseudohalide metal complexes with organic nitrogen ligands of the type ML2X2, where M = Cu, Ni, Co; L = pyrazole, imidazole or pyridine type ligand; X = [C(CN)3]-, [N(CN)2]- , [C(CN)2,NO]- are reviewed. Three types of µeff vs. T functions were ascertained and discussed in terms of both ferro- and antiferromagnetic interactions, which operate between the Cu(II) atoms through orbitals of the bridging pseudohalides. The theory of Kahn et. al. is applied to understand the complex magnetic behaviour of these compounds.

889-
892

Syntheses and Properties of µ-2-Bromoterephthalato Manganese(II) Binuclear Complexes

by J.M. Shi, D.Z. Liao, J.Z. Cui, Z.H. Jiang and G.L. Wang
Department of Chemistry, Nankai University, Tianjin 300071, P.R. China

(Received February 7th, 1997; revised manuscript March 13th, 1997)

Three new manganese(II) binuclear complexes: [Mn2(BTPHA)(Phen)4](ClO4)2 (1), [Mn2(BTPHA)(Nphen)4](ClO4)2 ·H2O (2), [Mn2(BTPHA(Bpy)4](ClO4)2·H2O (3), (BTPHA = 2-bromoterephthalate, Phen = 1,10-phenanthroline, Nphen = 5-nitro-1,10-phenanthroline, Bpy = 2,2-bipirydyl), have been synthesized with 2-bromoterephthalato as the bridged ligand, and were characterized by elemental analysis, IR, molar conductance and electronic reflection spectra. They are proposed to have an extended 2-bromoterephthalato-bridged structure and to consist of two manganese(II) atoms. The variable-temperature magnetic susceptibility of complex 1 was measured over 4.2-300 K. The magnetic coupling parameter is consistent with an antiferromagnetic exchange between the two manganese(II) centers and fits the data with binuclear magnetic exchange model based on the Hamiltonian operator (H=- 2JS1S2, S1 = S2 = 5/2), giving the antiferromagnetic coupling parameter of 2J = -2.3 cm-1.

893-
897

The CuGaSe2-CdSe Section of the Quasiternary
Cu2Se-CdSe- Ga2Se3 System

by I.D. Olekseyuk, E.M. Kadykalo and O.F. Zmiy
Department of Inorganic and Physical Chemistry,
Volyn' State University, Voli av. I3, Lutsk 263009, Ukraine

(Received January 21st, 1997; revised manuscript March 18th, 1997)

The interaction of copper selenogalate with cadmium selenide was investigated using differential thermal, microstructural and X-ray analyses. Polythermal CuGaSe2-CdSe section of the quasiternary Cu2Se-CdSe-Ga2Se3 system has been constructed. The existence of an intermediate delta-phase and solid solutions has been established.

898-
902

Phase Equilibria in the V2O5-Fe2WO6System

by J. Walczak, I. Rychlowska-Himmel and A. Blonska-Tabero
Department of Inorganic Chemistry, Technical University of Szczecin,
Al. Piastow 42, 70-065 Szczecin, Poland

(Received December 23rd, 1996; revised manuscript April 14th, 1997)

Using DTA and X-ray phase diffraction methods, a diagram of phase equilibria in V2O5-Fe2WO6 system has been constructed. This system is not a real binary system, even below the solidus line.

903-
907

Peptide Synthesis with the Use of
N,N'-Dicyclopentylcarbodiimide

by J. Izdebski, A. Orlowska, M. Pachulska and E. Witkowska
Laboratory of Peptides, Department of Chemistry, University of Warsaw,
PL-02093 Warsaw, Pasteura 1, Poland, E-mail: izdebski@chem.uw.edu.pl

(Received February 14th, 1997)

The usefulness of N,N'-dicyclopentylcarbodiimide as a coupling reagent for solid phase peptide synthesis was demonstrated by the synthesis of sequences comprising the 65-74 residues of acyl carrier protein. The result was compared with that obtained using N,N'-dicyclohexylcarbodiimide and N-cyclohexyl-N'- isopropylcarbodiimide. The title compound was also used for synthesis of [Nle27]GH-RH(1- 29)NH2. All coupling steps were monitored with quantitative ninhydrin test. It is concluded that this new reagent can be successfully used for solid phase peptide synthesis.

908-
914

3,3-Diarylphthalides. Part I.
Friedlaender Reaction of 3'-Alkylphenolphthaleins

by J.K. Ruminski
Faculty of Chemistry, Nicolas Copernicus University,
ul. Gagarina 7, 87-100 Torun, Poland

(Received January 2nd, 1997; revised manuscript February 27th, 1997)

Friedlaender reaction was investigated, starting from 3'-alkyl-derivatives of phenolphthalein 1- 3 (alkyl = Me, Et and i-Pr) and hydroxylamine in strongly alkaline medium. The process was found to give, after acidic hydrolysis of primarily formed anil-type semi-products, a mixture of two 2-aroylbenzoic acids (2-ABAs) in each case. Identification and quantification of 2-ABAs were carried out within RP-HPLC on ODS column. Based on quantitative results, migratory aptitude (MA) parameter values of ionized 4-hydroxy-3- alkylphenyl nuclei were calculated, taking an unsubstituted ionized 4-hydroxyphenyl ring as a standard.

915-
923

Design and Synthesis of New Bradykinin
Antagonists with N-Terminal Acylation

by A. Prahl1, T. Wierzba2, M. Wszedybyl2, W. Juzwa2 and B. Lammek1
1Department of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdansk, Poland
2Institute of Physiology, Medical Academy, Debinki 1, 80-211 Gdansk, Poland

(Received November 15th, 1996; revised manuscript March 3rd, 1997)

Synthesis and some pharmacological properties of eight new analogues of bradykinin are described. Five peptides were designed to gain more information about features of N-terminal bulky acyl groups suitable for improvement of B2-antagonistic properties. Two other compounds were synthesized in order to learn how removal of N-terminal D-Arg residue or replacement of D-Arg-Arg with a Lys-Lys fragment would influence B2-antagonism. The last peptide was obtained in order to check whether inversion of configuration of C-terminal Arg residue in the molecule of potent B2-blocker will decrease its antagonistic activity. The B2-antagonistic potency of analogues was evaluated by their ability to inhibit vasodepressor response to exogenous bradykinin in conscious rats. Thus it appears that not only the size of an acyl group attached to the N-terminus of peptide, but also chemical features of the substituent are important for B2-antagonism.

923-
928

Synthesis and Antibacterial Activity of Novel
1-Butyl-2-phenoxy/2-Phenylthio/2-Aminomethyl-5-
- methoxyindole Derivatives

by G.S. Gadaginamath and S.A. Patil
P.G. Department of Studies in Chemistry, Karnatak University, Dharwad-580 003, India

(Received June 4th, 1996; revised manuscript March 3rd, 1997)

6-Bromo-2-bromomethyl-1-butyl-3-ethoxycarbonyl-5-methoxy-indole (2) was prepared from 2- methylindole derivative 1 using NBS as regioselective brominating agent. Compound 2 was then reacted with different nucleophiles: phenols, thiophenols and amines to yield the corresponding phenoxy, phenylthio and aminomethylindole derivatives. All new compounds were screened for antibacterial activity.

929-
935

Antagonists of Bradykinin Modified with
Conformationally Restricted Dipeptide Fragment

by A. Prahl1, T. Wierzba2, P. Winklewski2, P. Musial2,
W. Juzwa2 and B. Lammek1
1Department of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdansk, Poland
2Institute of Physiology, Medical Academy, Debinki 1, 80-211 Gdansk, Poland

(Received February 10th, 1997; revised manuscript March 10th, 1997)

Four new analogues of bradykinin (BK) were designed, synthesized and bioassayed. The analogues were designed by introduction of the conformationally restricted dipeptide fragment D-Phe-D-Phe into positions 6, 7 or 7, 8 of an previously synthesized antago-nist. The antagonistic potency of peptides was assessed by their ability to inhibit vasodepressor response to exogenous bradykinin in conscious rats. We proved the importance of appropriate localization of the modification used in the molecule for the value of antagonistic activity. We also demonstrated that acylation of the N-terminus of the new analogues with 1-adamantaneacetic acid did not increase, as previously considered, antagonistic potencies of the resulting peptides. Our study, besides providing new information about the structure-activity relationship of bradykinin antagonists, resulted in compounds, which may be useful for clarifying the role of BK in various physiological effects.

936-
940

From Sugar Allyltins to Chiral Cyclopentadienes:
Radical Cyclization of Highly Oxygenated
Sugar- Derived Dienoaldehydes

by M. Mach and S. Jarosz
Institute of Organic Chemistry, Polish Academy of Sciences,
Kasprzaka 44, 01-224 Warszawa, Poland (e-mail: sljar@ichf.edu.pl)

(Received March 12th, 1997)

Radical cyclization of unsaturated aldehyde: 2,3,4-tri-O-benzyl-5,6,7,8-tetradeoxy- -5(E),6-dieno-oct-D- xylose (2) afforded 1(R)-hydroxy-2(S),3(S),4(R)-tri-O-benzyloxy-5(R)-[prop-1(E)-enyl]-cyclopentane (5); similar reaction of xanthate 7 derived from 2 led to 2(S),3(R),4(R)-tri-O- benzyloxy-5(R)-methyl-cyclopentane (8). The cyclization of other sugar-derived unsaturated aldehydes and xanthates was also studied.

941-
946

Zinc Chloride Catalyzed Ring Opening of 3-Mono-
and 3,3-Disubstituted Glycidonitriles
by Means of Acetyl Chloride

by T. Zdrojewski, M. Fedorynski and A. Jonczyk
Warsaw University of Technology, Faculty of Chemistry,
Koszykowa 75, 00-662 Warsaw, Poland

(Received February 27th, 1997; revised manuscript March 25th, 1997)

Glycidonitriles 1a-e, when treated with acetyl chloride in the presence of catalytic amounts of zinc chloride, afforded mixtures of chloroacetoxynitriles 2 and acetoxycyanoalkenes 4. Isolated nitriles 2 treated with triethylamine transform into substituted acetoxyacrylonitriles 3.

947-
954

Pentad Distribution of Acrylic Copolymers
by 13C NMR Spectroscopy

by M. Matlengiewicz
Institute of Coal Chemistry, Polish Academy of Sciences,
ul. Sowinskiego 5, 44-102 Gliwice, Poland

(Received February 10th, 1997; revised manuscript March 26th, 1997)

The carbonyl signal of the 100 MHz 13C NMR spectrum of methacrylate/acrylate copolymers provides sufficient resolution for detailed analysis of sequence distribution up to configurational-compositional pentads. It has been shown for the investigated methyl methacrylate/ethyl acrylate copolymer, MMA/EA, that the spectrum of carbonyl region can be positively simulated by applying Bernoulli/1st order Markov statistics to calculate the sequence intensities and a method of incremental calculation of chemical shift to determine the line positions. The method may be readily adopted for other acrylate/methacrylate copolymer systems.

955-
961

Polymerization of Propylene Oxide
on Anatase Surface

by T.V. Chernyavskaya, V.V. Brei, A.G. Grebenyuk,
L.S. Dzyubenko and A.A. Chuiko
Institute of Surface Chemistry, National Academy of Sciences of Ukraine,
Prospekt Nauky 31, 252022 Kiev, Ukraine

(Received July 12th, 1996; revised manuscript April 4th, 1997)

The polymerization of propylene oxide on the surface of thermoactivated anatase has been studied by infrared spectroscopy, thermal gravimetry, field ionization mass spectrometry, and quantum-chemical simulation. Data are given upon the dependence of the grafted oligomer mass on the temperature of the preliminary treatment of anatase surface. The coordination mechanism of the propylene oxide polymerization with the participation of Ti4+ ions of the TiO2 matrix is discussed.

962-
967

Influence of Na+ Ions on the Specific Surface Area
of MgO Catalysts and Their Activity
in Oxidative Coupling of Methane

by W. Ignaczak, W. K. Jozwiak, D.T. Gebauer and T. Paryjczak
Institute of General and Ecological Chemistry, Technical University of Lodz,
90-924 Lodz, ul. Zwirki 36, Poland

(Received January 30th, 1997)

Results concerning the influence of calcination conditions and Na+ ions addition on the specific surface area of MgO using BET and XRD techniques are presented. Na+ ions cause the sintering process of MgO - a considerable loss of surface area and structural changes in MgO lattice. Na+/MgO doped catalysts were active and selective for C2 hydrocarbons formation, especially above 950 K.

968-
976

Selected Problems Related to Polymeric Electrolytes
from the PEO-H3PO4 System

by J. Przyluski, A. Zalewska , J. Maron and W. Wieczorek
Department of Chemistry, Warsaw University of Technology,
ul. Noakowskiego 3, 00-664 Warsaw, Poland

(Received November 29th, 1996; revised manuscript January 30th, 1997)

Protonic electrolytes from the PEO-H3PO4 system are studied by impedance and Fourier transform infrared spectroscopies and differential scanning calorimetry. Different conduction mechanisms are found depending on the concentration of H3PO4 and are discussed on the basis of the experimental data.

977-
985

Effect of Addition of LiCl on Reaction Rates
in Dehydrocoupling of Hydrosilanes with Hydroxyl
Containing Nucleophiles, in DMF Catalyzed by ZnCl2

by J. Chrusciel
Institute of Polymers, Faculty of Chemistry, Technical University, 90-924 Lodz 40, Poland

(Received October 16th, 1996; revised manuscript February 3rd, 1997)

The addition of LiCl causes a decrease in reaction rate and even inhibition of dehydrocoupling of organic hydrosilanes (Et3SiH and Me2PhSiH) with Ph3SiOH, Ph2Si(OH)2, MeOH, and PhCOOH, when carried out in DMF in the presence of ZnCl2. The rate constants are proportional to the difference in the catalyst and LiCl concentrations, due to the effect of addition of a common anion on the dissociation equilibria. The driving force for the reaction is an electrophilic assistance of the active form(s) of the catalyst (most likely Zn2+) to the cleavage of the Si—H bond in the rate determining step, while the interaction of chloride anion Cl- with silicon in H-silanes does not play any role in the reaction mechanism. This is a new example of the mechanism of the nucleophilic substitution of hydrosilanes with reagents containing a hydroxyl group, because of zero order of the reaction with respect to OH group.

986-
991

Osmium(VIII) Catalyzed Oxidation of Allyl Alcohol by N-Bromosuccinimide in Aqueous Alkaline Medium

by R.B. Chougale, D.L. Kamble and S.T. Nandibewoor
Department of Chemistry, Karnatak University, Dharwad-580 003, India

(Received October 9th, 1996; revised manuscript February 7th, 1997)

The osmium(VIII) catalyzed oxidation af allyl alcohol by N-bromosuccinimide in alkaline medium is first order each in [N-bromosuccinimide] and [osmium(VIII)], whereas fractional order each in [allyl alcohol] and [alkali]. Increase in [alkali] increases the rate, while added succinimide retards the reaction. Negligible effect of dielectric constant and ionic strength on the reaction medium has been observed. A mechanism involving hypobromite ion, as the reactive species of the oxidant has been proposed. The reaction constants of individual steps of the reaction mechanism have been evaluated.

992-
1004

Transport Properties of Nonstoichiometric
Manganous Sulphide

by S. Mrowec, M. Danielewski and A. Wojtowicz
Department of Solid State Chemistry, University of Mining and Metallurgy,
al. Mickiewicza 30, Krakow, Poland

(Received February 21st, 1997; revised manuscript March 24th, 1997)

The chemical diffusion coefficient in non-stoichiometric manganous sulphide, Mn1-yS, has been measured as a function of temperature (1073-1373 K) and sulphur activity (10-2- 103 Pa) using electrical conductivity reequilibration method. It has been shown that the mobility of doubly ionized cation vacancies, constituting the predominant point defects in Mn1-yS, is independent of their concentration and characterized by the following empirical relationship: Dv = 1.3· 10-2exp((76.4+/-0.5 kJ mol-1)/(RT)).
Using these data and those of non-stoichiometry the self-diffusion coefficient of cations in metal deficient manganous sulphide has been calculated: DMn = 6.5. 10-4pS21/6 exp((119.0+/-0.7 kJ mol-1)/(RT)). This relationship is in agreement with that calculated from manganese sulphidation kinetics. It may be then concluded, that the growth process of alfa-MnS scale on manganese at high temperatures (> 1000 K) is governed by the volume diffusion of cations.

1005-
1011

The Structure of 3-[4-(4-Phenylpiperazine)butyl]-
-5,5-diisopropylhydantoin - New Ligand
of Serotonin Receptors

by I. Wolska1, H. Byrtus2 and A. Zejc2
1Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland
2Department of Pharmaceutical Chemistry, Collegium Medicum, Jagiellonian University,
Medyczna 9, 30-688 Krakow, Poland

(Received January 31st, 1997)

The crystal structure of 3-[4-(4-phenylpiperazine)butyl]-5,5-diisopropylhydantoin has been determined by X- ray diffraction methods. Compound crystallizes in a monoclinic system, space group P21/n with a = 12.943(2), b = 8.514(2), c = 21.746(2) Å, ß = 103.96(1)o, V = 2325.6(7) Å3. The piperazine ring adopts a chair conformation. The phenyl ring and the mean piperazine plane are close to coplanarity. The molecules form centrosymmetric dimers by means of the intermolecular hydrogen bonds N-H···O.

1012-
1019

Bicyclic [b]-Heteroannelated Pyridazine Derivatives. 7.
Structure of O-benzyl-8-phenyl-3- trifluoromethyl-
triazolo[4,3-b]pyridazine-6(5H)-ones

by J. Karolak-Wojciechowska1, J. Lange2 and H.B. Trzezwinska1
1Institute of General Chemistry, Technical University, 90-924 Lodz, Poland
2Chemistry Department, University of Technology, 00-664 Warsaw, Poland

(Recived February 6th, 1997; revised manuscript March 10th, 1997)

The structure of O-benzyl-7,8-dihydro-8-phenyl-3-trifluoromethyl-
-triazolo[4,3-b]pyridazine- 6(5H)-one has been solved. Two independent molecules found in the unit cell differ in the rotational position of the benzoyl substituent on the C6-O10 and O10-C10 bonds by 6o and 15o respectively. The differences result from the unit cell packing requirements.

1020-
1028

Structure and Magnetism of Nickel(II) Dimer
with Thiourea Bridges

by M. Melnik1, T. Sramko1, M. Dunaj-Jurco1, V. Jorik1,
B. Kalinska2 and J. Mrozinski2
1Department of Inorganic Chemistry, Technical University,
Radlinskeho 9, 812-37 Bratislava, Slovakia
2Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie str., 50-383 Wroclaw, Poland

(Received March 21st, 1997)

The crystal lattice of the title red-brown compound contains dimeric [Ni2(tu)8Br2]2+ cations and NO3- anions. The cations consist of symmetrically bridged S atoms of thiourea with Ni-S bridging distance of 2.47 Å, the Ni-Ni distance of 4.04 Å, and the bridging angle of 104o. Each nickel(II) atom has a distorted octahedral S5Br coordination sphere. The susceptibility data for powder, determined betwen 4.2 and 295 K, show the existence of antiferromagnetic intradimer interaction between the nickel(II) centers.

1029-
1031

An Expedient Differentiation between Substituted
1,3-Oxazolane and 1,3-Dioxane Moieties
by Mass Spectrometry

by O. Achmatowicz, E. Baranowska and B. Szechner
Pharmaceutical Research Institute, 8 Rydygiera Str., 01-793 Warszawa, Poland

(Received March 18th, 1997)

1032-
1035

IUPAC Recommendations on Nomenclature and Symbols

• Nomenclature, symbol, units and their usage in spectrochemical analysis - XVI
Laser-based Molecular Spectrometry for Chemical Analysis - Luminescence

• Revised section F: natural products and related compounds

• Glossary of terms used in medicinal chemistry
(IUPAC Recommendations 1996)

• Nomenclature, symbol, units and their usage in spectrochemical analysis - XIV
Laser-based molecular spectroscopy: proposal for a new notation


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