CONTENTS OF VOL. 71 NO 3 (1997)

265 Self-Assembly of Sb(III) and Bi(III) Halo-Coordinated Octahedra in Salts of OrganicCations. Structure, Properties and Phase Transitions - Sobczyk L., Jakubas R. and Zaleski J.


301 Synthesis and Characterization of Novel Heterotrinuclear CoIICuIICoII Complexes - Miao M.M., Cheng P., Liang M., Liao D.Z., Jiang Z.H. and Wang G.L.

305 Interaction of Neodymium and Iron with Tin at 500<144>C and 800<144>C- Salamakha P., Demchenko P., Sologub O., Bodak O. and St<143>pie<167>-Damm J.

309 Interaction of Components in the La<196>Ni<196>Zn System - Pavlyuk V.V., Opainych I.M., Bodak O.I., Palasi<167>ska T., Ro<208>d<208>y<167>ska B. and Bala H.

314 Synthesis and Magnetism of Homo-Trinuclear NiII<196>NiII<196>NiII Complexes Bridged bya-Furildioximato Groups - Zhang S.W., Yan S.P., Liao D.Z., Jiang Z.H., Liu Y.J. and Wang G.L.

320 Copper(II) Complexes with Trimethyl Phosphite and Perfluorinated Carboxylates - Sz<150>yk E., Grodzicki A., Szyma<167>ska I., Wrzeszcz G. and Rozp<150>och F.

ORGANIC CHEMISTRY 328 Nucleophile-Induced Ring Opening in 4-Pyridylpyridinium Chloride Coordinated to Metal Ions - Baran W., Szymo<167>ska J. and Tomasik P.

338 Steric Hindrance of Anti-Tumor Anthracenediones: Molecular Dynamics Simulation - Mazerski J., Martelli S. and Borowski E.


346 The Mechanism and Kinetics of the Anodic Reaction on Pyrolytic Graphite in Cryolite--Alumina Melts - Kisza A., Thonstad J. and Eidet T.

353 Molecular Dipole Moment and Interaction Dipole Moment in 2-N-Substituted Amino-5--nitro-6-methylpyridines - Palasek B., Pawe<150>ka Z. and Puszko A.

357 Spectra, Structure and Stability of Nickel(II) Chloride Complexes in N, N-Dimethylacetamide Solutions - Pastewski R.

368 Ethene Adsorption on X-type Zeolites at Various Temperatures - Garbacz J.K., Karpi<167>ski K., D<131>browski M. and Zi<162><150>kowska D.

380 Low Temperature Adsorption of Nitrogen on Homogeneous and Heterogeneous Nonporous and Mesoporous Carbonaceous Adsorbents - Choma J. and Jaroniec M.

CRYSTAL AND MOLECULAR STRUCTURES 390 Crystal Structure of Stibnite Sb2S3 in Phase II at 320 K - <149>ukaszewicz K., Pietraszko A., St<143>pie<167>-Damm J., Grigas J. and Kajokas A.

COMMUNICATIONS 396 Individual Extraction Constants of Some Univalent Anions in the Water<196>NitrobenzeneSystem - Makrl<161>k E.

400 Stability of Chelate Complexes of Cobalt(II) and Nickel(II) with Hydroxy Acids - John E. and Czoik R. 403 Regioselective Transesterification of Dimethyl 3-Oxohexanedioate - Szychowski J.and Wojtasiewicz K.

pp. 265-300

Self-Assembly of Sb(III) and Bi(III) Halo-Coordinated Octahedra in Salts of Organic Cations.Structure, Properties and Phase Transitions

by L. Sobczyk1, R. Jakubas1 and J. Zaleski2

1Faculty of Chemistry, University of Wroc<150>aw, 50-383 Wroc<150>aw, Poland 2Institute of Chemistry, University of Opole, 45-052 Opole, Poland

(Received November 8th, 1996)

A review of studies on crystals of a general formula AxMyXz (A is an organic cation, M = Sb(III), Bi(III) and X = Cl, Br, I) is presented. A variety of polyanionic structures was reported depending on the stoichiometry, the size and symmetry of an organic cation and the ability to form the hydrogen bonding. A number of the order-disorder phase transitions was revealed related to the dynamics of cations. Numerous crystals show interesting properties (ferroelectric, ferrielectric, ferroelastic, nonlinear optical) rendering them promising materials from the point of view of applications. A complete setting-up is given of the X-ray diffraction, DSC, dielectric, NMR, IR and Raman, NQR, dilatometric, pyroelectric, Brillouin scattering, birefringence, ultrasonic, neutron scattering studies reported up-to-date.

pp. 320-327

Copper(II) Complexes with Trimethyl Phosphiteand Perfluorinated Carboxylates

by E. Sz<150>yk1, A. Grodzicki1, I . Szyma<167>ska1, G. Wrzeszcz1 and F. Rozp<150>och2

1Department of Chemistry, Nicholas Copernicus University, 87-100 Toru<167>, Poland 2Department of Physics, Jab<150>o<167>ski Institute, 87-100 Toru<167>, Poland (Received July 29th, 1996; revised manuscript December 13th, 1996)
New Cu(II) complexes with trimethyl phosphite and aliphatic perfluorinated carboxylates of the type Cu(OH)(OOCR)[P(OCH3)3], where R = CF3, C2F5, C3F7, C6F13, C7F15, C9F19 were synthesized and their spectroscopic and thermal properties studied. EPR spectra and magnetic susceptibility results indicate the formation of polymeric complexes with five coordinated Cu(II). Examination of COO absorption bands suggests bridging carboxylates in the coordination sphere. Hydroxy group is also in bridging position whereas trimethyl phosphite is monodentately bonded. Thermal decomposition is a multistage process, which in nitrogen and air atmosphere yields a mixture of Cu2O and Cu2P2O7 .

pp. 328-337

Nucleophile-Induced Ring Opening in4-Pyridylpyridinium ChlorideCoordinated to Metal Ions
by W. Baran, J. Szymo<167>ska and P. Tomasik
Department of Chemistry, University of Agriculture, Mickiewicz Ave., 21, 31 120 Cracow, Poland (Received October 23th, 1996) An attack of the hydroxyl nucleophile on 4-pyridylpyridinium chloride (PPC) resulted in a sequence of reactions leading to glutaconic aldehyde (GA) and 4-aminopyridine (AP) via corresponding unstable 5-(amino-N-pyridyl)-2, 4-pentadienal i. e. glutaconic aldehyde 4-aminopyridine monoanil (GAMA). The Cu(II), Mn(II) and Co(II) ions in the corresponding PPC complexes did not affect the pyridine ring cleavage but protected GAMA from hydrolysis. The structure of PPC metal complexes depended on the metal ion. Key words: glutaconic aldehyde 4-aminopyridyl monoanil, 4-pyridylpyridinium chloride, 4-pyridylpyridinium chloride metal complexes, synthesis through coordination p. 338-345 Steric Hindrance of Anti-Tumor Anthracenediones: Molecular Dynamics Simulation by J. Mazerski1, S. Martelli2 and E. Borowski1 1Department of Pharmaceutical Technology and Biochemistry, Technical University of Gda<167>sk, 11/12 Narutowicza St., 80-952 Gda<167>sk, Poland 2Department of Chemical Sciences, University of Camerino, 62-032 Camerino (MC), Italy (Received July 29th, 1996; revised manuscript November 18th, 1996) It has been suggested that low efficiency in oxygen radicals formation observed for synthetic anti-tumor anthracenediones could result from their low affinity to NADH dehydrogenase. Conformational analysis of side chains of ametantrone as well as mitoxantrone and its metabolite in hydrophobic environment, expected for catalytic center of NADH dehydrogenase, were simulated by molecular dynamics. Non-charged forms of studied compounds were analyzed. Characteristic conformations of side chains resulting from intramolecular hydrogen bonds were observed. Stable interchain hydrogen bonds placed side chains under or over the plane of anthraquinone ring system. Existance of hydrogen bonds between quinone oxygen atoms and amino as well as hydroxyl groups of side chains were also evidenced. Consequences of that conformational characteristics for affinity of studied compounds to NADH dehydrogenase were discussed. Key words: anti-tumor anthracenedione, molecular dynamics simulation, side chain conformation p. 390-395 Crystal Structure of Stibnite Sb2S3in Phase II at 320 K by K. <149>ukaszewicz1, A. Pietraszko1, J. St<143>pie<167>-Damm1, J. Grigas2 and A. Kajokas2 1Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ok<162>lna 2, 50-950 Wroc<150>aw, Poland 2Department of Physics, University of Vilnius, Sauletekio al. 9/3, 2054 Vilnius, Lithuania (Received October 24th, 1996; revised manuscript December 16th, 1996) The crystal structure of Sb2S3 (stibnite) at room temperature has been reported in the literature in the non-polar space group Pnma. Numerous investigations of physical properties of Sb2S3 indicate, however, phase transitions at about 420 and 300 K, and on the absence of symmetry center at ambient temperature. Above 420 K, in phase I, Sb2S3 is non-polar with the space group Pnma. The crystal structure of Sb2S3 in the phase II stable in the region 300-420 K has been determined at T = 323 K, a = 11.233(2) <143>, b = 11.315(2) <143>, c = 3.838(1) <143>. The space group is polar P21nm (Pmn21 in standard setting) compatible with physical properties. Key words: crystal structure, ferroelectric semiconductor, phase transition, Sb2S3, stibnite