POLISH JOURNAL OF CHEMISTRY
Volume 73 Number 3 March 1999
Pages 417-578


CONTENTS

Page

INORGANIC CHEMISTRY
417 Synthesis and Antiferromagnetic Interaction in Tetrabromoterephthalato-Bridged Binuclear Iron(II) Complexes
— Li Y.T. and Yan C.W.
425 Distribution of Trace Amounts of Impurities During Nickel(II) Nitrate Crystallization
— Smolik M.
431 Phase Equilibria in the Ag2Se-InSe3-GeSe2(SnSe2) System
— Olekseyuk I.D., Krykhovets O.V. and Sysa L.V.
437 Spectroscopic Properties of Dithallium Phthalocyanine
— Janczak J.
447 The Role of the Side Group in Reactions Involving 1-Propyl-2-methylimidazole and
1-Propyl-2-imidazolecarboxaldehyde and Co(II), Ni(II), Cu(II) and Zn(II) Ions

— Barszcz B., Kulig J., Jezierska J. and Lisowski J.
457 Spectral and Thermal Properties of Copper(II) Complexes with Methyl-3-pyridyl Carbamate
— Mojumdar S.C., Melnik M. and Valko M.
465 Cobalt(II), Nickel(II) and Copper(II) Complexes with Adenosine 5'-Monophosphate and
Cytidine 5'-Monophosphate in Aqueous Solutions and in Solids

— Gąsowska A. and Łomozik L.
ORGANIC CHEMISTRY
475 A Novel Type of Ring Closure of Amino-Substituted Thiocarbonyl Ylides
— Romański J., Mlostoń G., Linden A. and Heimgartner H.
487 Synthesis and Crystal Strycture of 2,3,4-Tri-O-acetyl-ß-D-xylose 1-Phosphorothioselenoate
— Kudelska W., Olczak A., Główka M.L. and Jankowski S.
PHYSICAL CHEMISTRY
493 Hydrogen Evolution on Cobalt Cathode in Molten Organic Salt
— Więcek B.
501 The Inclusion Complex of Vitamin K3 Bisulfite with ß-Cyclodextrin Studied by Means of OSWV and UV-Visible Spectroscopy
— Gong X. and Li H.L.
509 Broensted and Lewis Solid Superacids of Carrier/Metal Halide Type
— Marczewski M., Marczewska H. and Juszczyk W.
519 Experimental Investigations of Chaotic and Periodic Oscillations During Anodic Dissolution of Copper on Rotating Disc Electrode
— Dolata M. and Kawczyński A.L.
527 Adsorption of L-histidine from Aqueous Solutions on the Mercury Electrode and
Air/Solution Interface

— Słojkowska R. and Jurkiewicz-Herbich M.
CRYSTAL AND MOLECULAR STRUCTURE
541 Crystal Structure, Thermal Expansion, Dielectric Permittivity and Phase Transitions of Bi2S3
— Łukaszewicz K., Stępień-Damm J., Pietraszko A., Kajokas A. and Grigas J.
547 Crystal and Molecular Structure of 3ß-Acetoxy-21-(2-hydroxy-2-methylpropoxy)-cholest-5-en-25-ol, the First "Double Side Chain" Cholesterol Analogue Investigated by X-ray Diffraction
— Gałdecka E., Gałdecki Z., Górkiewicz Z., Kurek-Tyrlik A., Makaev F.Z., Wicha J. and Calverley M.J.
DISCUSSION
573 A Remark on the Escape Time in a Model of Bistable Chemical System
— Górecki J.
COMMUNICATIONS
557 Synthesis and Magnetism of Binuclear Ni(II)-Ni(II) Complex with N,N-Bis(N-butyl-ethyleneamine)
oxamido as Bridging Ligand

— Zhao M.G., Li M.X., Shu C.Y., Lu J.J., Liu F.L. and Shi J.M.
561 Catalytic Hydrogen Transfer Over Magnesia. XI. Reduction of Conjugated and Non
conjugated Aliphatic Enones by 2-Propanol

— Gliński M. and Radomski P.
565 The Electrochemical Reduction of Dinuclear [FeIII,IV(H2Pr)2O]BF4.H2O Compound
— Szymaszek A., Yablokov Yu.V. and Mroziński J.
569 Sesquiterpenoids and Phenolics from Roots of Crepis foetida
— Kisiel W. and Barszcz B.
BOOK REVIEWS
577 E. de Hoffman, J. Charette and V. Stroobant: "Mass Spectrometry". Polish edition "Spektrometria Mas", Wydawnictwa Naukowo-Techniczne, Warszawa 1998, 324 pp.
— Wincel H.
578 P.W. Atkins: Chemia - Przewodnik po chemii fizycznej, PWN, Warszawa, pp. 378, translated by K. Pigoń from "Concepts in Physical Chemistry", Oxford Chemistry Guides, Oxford University Press, 1995
— Baranowski B.


ABSTRACTS


417-424

Synthesis and Antiferromagnetic Interaction
in Tetrabromoterephthalato-Bridged
Binuclear Iron(II) Complexes

by Y.T. Li1 and C.W. Yan2
1Department of Chemistry, Qufu Normal University, Qufu Shandong, 273165, P. R. China
2Department of Biology, Qufu Normal University, Qufu Shandong, 273165, P. R. China

(Received October 13th, 1998)

Five new binuclear iron(II) complexes have been synthesized and characterized, namely: [Fe2(BTPHA)L4](ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2-bpy); 2,9-dimethyl-1,10-phenanthroline (Me2-phen); 5-bromo-1,10-phenanthroline (Br-phen); 5-chloro-1,10-phenanthroline (Cl-phen) and 5-methyl-1,10-phenanthroline (Me-phen), respectively, and BTPHA represents the tetrabromoterephthalate dianion. Based on the elemental analyses, molar conductance measurements, and spectroscopic studies, extended BTPHA-bridged structures consisting of two iron(II) ions, each in an octahedral environment are proposed for these complexes. The variable temperature magnetic susceptibilities (4~300 K) for [Fe2(BTPHA)(Me2-bpy)4](ClO4)2 (1) and [Fe2(BTPHA)(Me2-phen)4](ClO4)2 (2) complexes were measured and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H = -2J S1.S 2 giving the exchange integrals J = -1.09 cm-1 for (1) and J = -2.13 cm-1 for (2). These results indicate the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule. The influence of the bromo substituents in the bridge ligand on the magnetic interactions between the metal ions in this kind of complexes is also discussed.

425-430

Distribution of Trace Amounts of Impurities
During Nickel(II) Nitrate Crystallization

by M. Smolik
Institute of Chemistry, Inorganic Technology and Electrochemistry,
Silesian Technical University, ul. B. Krzywoustego 6, 44-100 Gliwice, Poland

(Received May 15th, 1998; revised manuscript October 26th, 1998)

Distribution coefficients, D, of trace amounts of impurities (Mg2+, Co2+, Zn2+, Cd2+, Cu2+, Mn2+, Ca2+, Sr2+, Ba2+ and Pb2+) have been determined during crystallization of Ni(NO3)2.6H2O. Their dependencies on the ionic radii of M2+ ions, solubilities and structures of the corresponding nitrates as well as their abilities to form solid solutions with Ni(NO3)2.6H2O have been analyzed. The D values are comprised in the range 0.011(DSr)-0.40(DCo) and depend neither on solubilities in water of corresponding nitrates nor similarity of their crystal structure.These coefficients generally decrease when the difference between ionic radii of macrocomponent and microcomponent becomes larger, but this dependence is disturbed by relatively high values of DCo and DZn, resulting from the ability to form solid solutions Ni(Co)(NO3)2.6H2O and Ni(Zn)(NO3)2.6H2O. The solubility of macroamounts of cobalt(II) and zinc(II) nitrate hexahydrates in the solid phase (Ni(NO3)2.6H2O) is the main factor influencing their distribution coefficients.

431-436

Phase Equilibria in th>e Ag2Se-In2Se3-GeSe2(SnSe2) System

by I.D. Olekseyuk, O.V. Krykhovets and L.V. Sysa
Department of Inorganic and Physical Chemistry, Volyn State University, Voli av. 13, Lutsk 263009, Ukraine

(Received September 8th, 1998; revised manuscript October 30th, 1998)

Phase equilibria in Ag2Se-In2Se3-GeSe2 and Ag2Se-In2Se3-SnSe2 systems have been established using X-ray and microstructural analysis. Homogeneity region of the AgInSe2 compound and lattice parameters of solid solutions in both systems have been determined. Four new compounds have been found. X-ray single crystal study has been performed for Ag2In2GeSe6: space group Cc, a = 1.2692(3), b = 0.7492(1), c = 1.2644(3) nm, ß = 109.50(3)°.

437-446

Spectroscopic Properties of Dithallium Phthalocyanine

by J. Janczak
W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2 str. P.O.Box 937, 50-950 Wrocław, Poland

(Received July 10th, 1998; revised manuscript November 12th, 1998)

Black-green dithallium(I) phthalocyanine complex with metallic conductivity has been obtained in crystalline form. The UV-VIS, IR, far IR and resonance Raman spectra of the Tl2Pc complex are presented. The absorption electronic spectra indicate the proximity of the HOMO and LUMO of the Pc ligand in energy. The additional band at 516 nm is attributed to CT transition. The vibrational spectroscopic data of dithallium(I) phthalocyanine complex are discussed in terms of specific chemical bonds and atomic group and compared with the other phthalocyanines. An empirical vibrational assignment of the observed fundamentals is given.

447-456

The Role of the Side Group in Reactions Involving
1-Propyl-2-methylimidazole and 1-Propyl-2-imidazolecarboxaldehyde and Co(II), Ni(II), Cu(II) and Zn(II) Ions

by B. Barszcz1, J. Kulig1, J. Jezierska2 and J. Lisowski2
1Institute of Chemistry, Pedagogical University, 25-020 Kielce, Poland
2Faculty of Chemistry, University of Wrocław, 50-383 Wrocław, Poland

(Received September 3rd, 1998; revised manuscript November 26th, 1998)

The complexing properties of 1-propyl-2-methylimidazole (1-Pr-2-CH3Im) and 1-propyl-2-imidazolecarboxaldehyde (1-Pr-2-CHOIm) with CoII, NiII, CuII and ZnII were investigated pH-metrically at 25°C and at the ionic strength of 0.5 mol dm-3 (KNO3<->). The stability constants calculated indicate the formation of complexes with metal:ligand ratio of 1:1, 1:2, 1:3 and 1:4. The stability of the metal complexes with both imidazoles depends mostly on the substituent situated between the nitrogen atoms of the imidazole ring. It was found that the carboxaldehyde oxygen atom participates in the formation of the coordination bond. The formation of the weak chelate copper(II)-1-propyl-2-imidazolecarboxaldehyde complexes was confirmed by EPR spectra. The electronic spectra reveal that the cobalt(II) forms both tetrahedral and octahedral species with 1-Pr-2-CH3Im, but 1-Pr-2-CHOIm forms only six-coordinated compounds. The NMR spectra of 1-Pr-2-CHOIm indicate that hydration of the CHO takes place when Zn(II) ions are introduced into the ligand solution at pH 5.03.

457-463

Spectral and Thermal Properties of Copper(II)
Complexes with Methyl-3-pyridyl Carbamate

by S.C. Mojumdar1, M. Melnik1 and M. Valko2
1Department of Inorganic Chemistry, Slovak Technical University,
Radlinskeho 9, 812 37 Bratislava, Slovakia, E-mail: mojumdar@cvt.stuba.sk
2Department of Physical Chemistry, Slovak Technical University,
Radlinskeho 9, 812 37 Bratislava, Slovakia

(Received June 16th, 1998; revised manuscript November 27th, 1998)

Thermogravimetry (TG), differential thermal analysis (DTA), infrared (IR), electronic, EPR spectra and other analytical methods have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(ac)2(mpc)]2.2CH3OH (I), Cu(Clac)2(mpc) (II), Cu(Cl2ac)2(mpc)2 (III) and Cu(Cl3ac)2(mpc)2 (IV) (where ac = CH3COO-, Clac = ClCH2COO-, Cl2ac = Cl2CHCOO-, Cl3ac = Cl3CCOO- and mpc = methyl-3-pyridyl carbamate). The solid phase intermediate and resultant products of thermolysis had been identified. The possible scheme of decomposition of the complexes is suggested with as a final product, CuO. IR data suggest a unidentate coordination of carboxylate to copper(II). Methyl-3-pyridyl carbamate was coordinated through nitrogen atom of its heterocyclic ring in complexes I-IV. EPR spectra suggest a dimeric structure of complex I and monomeric structure of complexes II-IV.

465-474

Cobalt(II), Nickel(II) and Copper(II) Complexes
with Adenosine 5'-Monophosphate and Cytidine
5'-Monophosphate in Aqueous Solutions and in Solids

by A. Gąsowska and L. Łomozik
Faculty of Chemistry, A. Mickiewicz University, ul. Grunwaldzka 6, 60-780 Poznań, Poland

(Received July 6th, 1998; revised manuscript December 11th, 1998)

Determination of stability constants and calculation of distribution of complexes formed by Co(II), Ni(II) and Cu(II) with adenosine monophosphate (AMP) and cytidine monophosphate (CMP) were performed by using computer-aided analysis of potentiometric titration data. On the basis of a comparison of the protonation constants of free ligands and MHL-type complexes the proton localization in the coordination compounds was established. The coordination mode in complexes in solution as well as in solids was determined from the results of spectral as well as equilibrium studies. Formation of macrochelate complexes and the occurrence of coordination dichotomy of the N(1)/N(7) type as well as N(1)/N(7)/O (phosphate group) was evidenced. Contrary to the similar complexes with Cu(II) and Co(II), the phosphate group of the nucleotide becomes essentially involved in the interactions with Ni(II) ions only at high pH values. The modes of coordination in aqueous solution and solid complexes are compared.

475-485

A Novel Type of Ring Closure of Amino-Substituted Thiocarbonyl Ylides

by J. Romański1, G. Mlostoń1, A. Linden2 and H. Heimgartner2
1Department of Organic and Applied Chemistry, University of ŁódŸ,
Narutowicza 68, PL-90-136 ŁódŸ, Poland
2Organisch-chemisches Institut der Universitaet Zuerich, Winterthurerstrasse 190,
CH-8057 Zuerich, Switzerland

(Received November 24th, 1998)

The reaction of 4,4-dimethyl-1,3-thiazole-5(4H)-thiones 7a-c with dimethyl 2-diazo-3-(phenylamino)butanoate (2), prepared from dimethyl fumarate and phenyl azide, in toluene at 80°C yielded mixtures of dimethyl 2-(4,5-dihydro-4,4-dimethyl-1,3-thiazol-5-ylidene)-3-(N-phenylamino)butanedioates of type 11 and four diastereoisomeric 4,4-dimethyl-9-phenyl-1,6-dithia-3,9-diazaspiro[4.4]non-2-ene-7,8-dicarboxylates of type 12. The formation of the products of type 12 is rationalized by a novel cyclization of intermediate thiocarbonyl ylides 9. The structures of cis-12a, cis-12c, and trans-12c were established by X-ray crystallography.

487-492

Synthesis and Crystal Structure of
2,3,4-Tri-O-acetyl--D-xylose 1-Phosphorothioselenoate

by W. Kudelska1, A. Olczak2, M.L. Główka2 and S. Jankowski3
1Institute of Chemistry, Faculty of Pharmacy, Medical University of ŁódŸ,
90-151 ŁódŸ, Muszyńskiego 1, Poland
2Institute of General and Ecological Chemistry, Technical University of ŁódŸ,
90-924 ŁódŸ, Żwirki 36, Poland
3Institute of Organic Chemistry, Technical University of ŁódŸ,
90-924 ŁódŸ, Żeromskiego 116, Poland

(Received October 26th, 1998; revised manuscript November 24th, 1998)

Ambident anion derived from phosphorothioselenoates was glycosylated with 1,2,3,4-tetra-O-acetyl--D-xylopyranose in the presence of boron trifluoride etherate to yield Se-xylosyl and S-xylosyl phosphorothioselenoates. Structures of the products were established on the basis of selective oxidation, 31P NMR, 1H NOE studies and unambiguously by X-ray diffraction.

493-500

Hydrogen Evolution on Cobalt Cathode in Molten Organic Salt

by B. Więcek
Faculty of Chemistry, University of Wrocław, 50 383 Wrocław, 14, F. Joliot-Curie St., Poland

(Received September 3rd, 1998; revised manuscript November 6th, 1998)

The cathodic hydrogen evolution reaction on cobalt electrode in pure molten triethylammonium tetrafluoroborate has been studied using ac impedance and polarization curves methods. The data consist of Tafel slopes, exchange current densities, the apparent heat of activation and the double layer capacitance.

501-508

The Inclusion Complex of Vitamin K3 Bisulfite
with -Cyclodextrin Studied by Means of OSWV
and UV-Visible Spectroscopy

by X. Gong and H.L. Li
Department of Chemistry, Lanzhou University, 730000, Lanzhou, P.R.China

(Received July 6th, 1998; revised manuscript November 9th, 1998)

The reduction of Vitamin K3 bisulfite (VK3B) in the presence of -cyclodextrin (-CD) has been investigated by Osteryoung square wave voltammetry (OSWV) in phosphate buffer (pH = 6.6). The results showed that -CD forms a 1:1 inclusion complex with VK3B. The dissociation constant was calculated from the plot of Ipc2 vs. (Ipc(VK3B)2- Ipc2)/[-CD] to be Kd = 3.5×10-3 M. The diffusion coefficients of VK3B and the inclusion complex were obtained by chronocoulometry (CC) to be Df = 1.5×10-6 cm2/s and Dc = 0.7×10-6 cm2/s, respectively. UV-visible spectra gave further evidence of the complex formation and the dissociation constant obtained by spectroscopy, Kdi = 5.0×10-3 M, is in good agreement with that determined by electrochemistry.

509-518

Broensted and Lewis Solid Superacids of Carrier/Metal Halide Type

by M. Marczewski1, H. Marczewska1 and W. Juszczyk2
1Faculty of Chemistry of Warsaw University of Technology (Politechnika),
Koszykowa 75, 00-662 Warsaw, Poland
2Institute of Physical Chemistry of the Polish Academy of Sciences,
Kasprzaka 44/52, 01-224 Warsaw, Poland

(Received November 13th, 1998)

Superacid properties of alumina, silica-alumina and silica exposed to TiCl4 and HfCl4 vapour have been studied and compared with previously obtained results for catalysts containing BF3, SbF5, AlCl3 and ZrCl4. It was found that the reaction of the vapour of metal halides of Lewis nature (MeXn) with oxides like alumina, silica-aluminas and silica results in the formation of the Br<148>nsted superacid centres if acid strength of hypothetical acid MeXn.XH is higher than that of sulphuric one. The Lewis superacid centres are formed in the reaction of carrier containing alumina phase with metal halide of strong electron acceptor ability.

519-526

Experimental Investigations of Chaotic and Periodic
Oscillations During Anodic Dissolution of Copper on
Rotating Disc Electrode

by M. Dolata and A.L. Kawczyński
Institute of Physical Chemistry Polish Academy of Sciences,
01-224 Warsaw, Kasprzaka 44/52, Poland, E-mail: alk@ichf.edu.pl

(Received September 10th, 1998; revised manuscript November 26th, 1998)

Periodic (up to period 8) and chaotic oscillations observed during anodic dissolution of copper on rotating disc electrode (RDE) in a copper sulphate-sulphuric acid solution under potentiostatic conditions are described and analyzed. Limit cycles and strange attractors are reconstructed. The Poincarr sections and 1D return maps are presented and discussed.

527-539

Adsorption of L-histidine from Aqueous Solutions on the Mercury Electrode and Air/Solution Interface

by R. Słojkowska and M. Jurkiewicz-Herbich
Department of Chemistry, Warsaw University, ul. Pasteura 1, 02-093 Warsaw, Poland

(Received October 8th, 1998; revised manuscript December 11th, 1998)

The differential capacitance characteristics of Hg/0.1 mol dm-3 KF and Hg/0.1 mol dm-3 LiClO4 interfaces were studied in the presence of L-histidine (His). The strongest adsorption of His on the mercury electrode was observed in solutions at pH 8. Probably, it results from the strong interactions between mercury and His molecules possessing in these solutions one or two deprotonated nitrogen atoms in the imidazole ring. Quantitative analysis of the data was possible for the alkaline solutions only. The anomalies observed in the course of C-E curves in the neutral or acidic solutions are discussed. Adsorption of His on a free surface is very weak. Practically it results from the salting-out effect, because, in the case of the solution without the electrolyte, the His molecules do not adsorb at this interface.

541-546

Crystal Structure, Thermal Expansion, Dielectric
Permittivity and Phase Transitions of Bi2S3

by K. Łukaszewicz1, J. Stępień-Damm1, A. Pietraszko1,
A. Kajokas2 and J. Grigas2
1Institute of Low Temperature and Structure Research, Polish Academy of Sciences,
Okólna 2, 50-950 Wrocław, Poland
2Department of Physics, University of Vilnius, Sauletekio al. 9/3, 2040 Vilnius, Lithuania

(Received October 20th, 1998; revised manuscript November 12th, 1998)

The crystal structure of Bi2S3 both natural (bismuthinite) and synthetic, reported in the literature, was determined at ambient temperature in the non-polar space group Pbnm. Physical properties of Bi2S3 indicate, however, on the possible phase transitions both in the high and low temperature regions. Precise lattice parameters measured as a function of temperature have shown weak anomalies at 160 and 410 K. The phase transition above 400 K has been also confirmed by measurements of microwave dielectric permittivity along the c-axis. The crystal structure of Bi2S3 has been determined at 130, 295 and 460 K. At all three temperatures the crystal structure was successfully refined in the space group Pbnm. The weak phase transitions observed in Bi2S3 apparently do not change the symmetry, or these changes are too small to be detected at the present level of accuracy of the X-ray crystal structure determination.

547-555

Crystal and Molecular Structure of 3ß-Acetoxy-21-
-(2-hydroxy-2-methylpropoxy)-cholest-5-en-25-ol,
the First "Double Side Chain" Cholesterol
Analogue Investigated by X-ray Diffraction

by E. Gałdecka1, Z. Gałdecki2, Z. Górkiewicz2, A. Kurek-Tyrlik3,
F.Z. Makaev3, J. Wicha3 and M.J. Calverley4
1Institute of Low Temperature and Structure Research,
Polish Academy of Sciences, ul. Okólna 2, 50-950 Wrocław, Poland
2Institute of General and Ecological Chemistry, Technical University of ŁódŸ, 90-924 ŁódŸ, Poland
3Institute of Organic Chemistry, Polish Academy of Sciences, POB58, 01-224 Warsaw 42, Poland
4Leo Pharmaceutical Products, 55, Industriparken, DK-2750 Ballerup, Denmark

(Received September 18th, 1998; revised manuscript December 10th, 1998)

The title steroid crystallizes in the monoclinic P21 space group with unit cell dimensions: a = 11.745(2) , b = 10.564(2) , c = 12.979(3) , ß= 95.73(3)°. Its crystal and molecular structure was determined by X-ray diffraction methods. The A ring has a symmetrical chair conformation. The B ring has a half-chair conformation, with asymmetry parameter C25 , 6 = 0.6°. The C ring has an intermediate sofa-half-chair conformation with asymmetry parameters: C296 = 2.3°, C211 = 5.8°, C29,11 = 4.8°, and C28,96 = 5.6°. The D ring adopts an envelope conformation with asymmetry parameter C213 = 10.7°. The cholesterol side chain adopts a fully extended conformation with torsion angles -170.6(6)°, 167.9(6)°, -171.9(6)° and 175.6(7)°, i.e. it belongs to the most populated conformer A, and with the terminal C26 and C27 methyl groups in gauche, trans conformations.

557-559

Synthesis and Magnetism of Binuclear Ni(II)-Ni(II) Complex with N,N-Bis(N-butyl-ethyleneamine)oxamido as Bridging Ligand

by M.G. Zhao1, M.X. Li1, C.Y. Shu2, J.J. Lu2, F.L. Liu2 and J. M. Shi2
1Department of Chemistry, Xinzhou Normal College, Xinzhou, 034000, P. R. China
2Department of Chemistry, Shandong Normal University, Jinan 250014, P. R. China

(Received October 15th, 1998)

561-563

Catalytic Hydrogen Transfer Over Magnesia. XI.
Reduction of Conjugated and Nonconjugated Aliphatic Enones by 2-Propanol

by M. Gliński and P. Radomski
Warsaw University of Technology (Politechnika), Faculty of Chemistry,
Laboratory of Catalytic Synthesis, Noakowskiego 3, 00-664 Warsaw, Poland
E-mail: marekg@ch.pw.edu.pl

(Received October 27th, 1998)

565-567

The Electrochemical Reduction of Dinuclear [Fe2III,IV(H2Pr)2O]BF4 × H2O Compound

by A. Szymaszek1, Yu.V. Yablokov2 and J. Mroziński1


1Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie str., 50-383 Wrocław, Poland
2Zavoisky Physical-Technical Institute, Sibirsky Trakt 10/7, 420029 Kazań, Tatarstan, Russian Federation

(Received July 27th, revised manuscript November 2nd, 1998)

569-571

Sesquiterpenoids and Phenolics from Roots of Crepis foetida

by W. Kisiel and B. Barszcz
Department of Phytochemistry, Institute of Pharmacology, Polish Academy of Sciences,
Smętna 12, 31-343 Kraków, Poland

(Received November 19th, 1998)

573-576

A Remark on the Escape Time in a Model of Bistable Chemical System

by J. Górecki
Institute of Physical Chemistry and College of Science, Polish Academy of Sciences,
Kasprzaka 44/52, PL-01-224 Warsaw, Poland

(Received July 7th, 1998; revised manuscript November 13th, 1998)

577

E. de Hoffmann, J. Charette and V. Stroobant: "Mass Spectrometry".
Polish edition ,,Spektrometria Mas",
Wydawnictwa Naukowo-Techniczne, Warszawa 1998, 324 pp.

reviewed by H. Wincel

578

P.W. Atkins: Chemia - Przewodnik po chemii fizycznej,
PWN, Warszawa, 1997, str. 378,
translated by K. Pigoń from "Concepts in Physical Chemistry",

reviewed by B. Baranowski


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