Best viewed with Netscape Navigator (ver. 3.0 or higher)
and Internet Explorer (ver. 3.0 or higher).

   

PL ISSN 0137-5083

POLISH      
JOURNAL     
       OF CHEMISTRY     

Please, choose:


Volume 71 Number 6 June 1997
Pages 695-848

 
   


Polish Chemical Society 

  

CONTENTS


Page

INORGANIC CHEMISTRY
695 New Weakly Ferromagnetic Coupling Dicopper(II), Antiferromagnetic Dinickel(II) and Dicobalt(II) Complexes with 1,8-Naphthalato as Bridging Ligand: Synthesis Spectrum and Magnetism — Gao J., Ma S.L., Jin Ch.Y. and Liao D.Z.
701 The CdSe-Ga2Se3-GeSe2 System at 870 K — Olekseyuk I.D., Parasyuk O.V.,
Sysa L.V. and Yurchenko Yu.V.
705 Mixed Thiocyanato-Thione Rhenium(V) Complexes — Mashaly M.M. and El-Behairy M.
712 X-ray Investigation of the Li-Ag-{Si,Ge} System at 470 K — Kevorkov D.G.,
Pavlyuk V.V. and Bodak O.I.
716 Technology and Crystal Structure of the Tl3PbI5 Monocrystals and Some Their Physical Properties — Olekseyuk I.D., Davydyuk H.Ye., Fedonyuk A.A., Sysa L.V. and
Padalko A.M.
721 Phase Equilibria of Ag33.3Sn16.7Se50-CdSe Section of the Quasiternary Ag2Se-CdSe-SnSe2 System — Olekseyuk I.D., Piskach L.V. and Parasyuk O.V.
725 Phase Equilibria in the Section V2O5-Cr2(MoO4)3 — Filipek E. and Walczak J.
ORGANIC CHEMISTRY
731 Spectroscopic Study of the Complexation of Iodine with 2,4,6,8-Tetraphenyl-2,4,6,8-tetraazabicyclo[3.3.0]octane — Rouhollahi A., Kakanejadifard A., Farnia S.M.F. and Shamsipur M.
739 Reactions of 1-Acylmethylene-3,3-dimethyl-1,3-dihydroisobenzofurans with Nucleophiles. Part II. Synthesis of 1,3-Dihydroisobenzofuran Derivatives with a Functionalized Ethylidene or Allylidene Group — Wichert-Tur Z.
747 Isomerization of Di- and Multifunctional Allyl Compounds Catalyzed by Ruthenium and Rhodium Complexes — Krompiec S., Suwinski J., Grobelny J. and Wagner P.
754 Synthesis of New Phosphate and Phosphite Esters of C-lariat Crown Ethers
— Schroeder G. and Gierczyk B.
757 Structure of Cyclodextrins and Their Complexes. Part 6. The NMR Observation of Separate Signals of Host and Guest Pertaining to 1:1 and 1:2 Complexes of 1,8-Dimethylnaphthalene with ß-Cyclodextrin — Dodziuk H., Sitkowski J., Stefaniak L., Sybilska D., Jurczak J. and Chmurski K.
767 Synthesis and In vitro Anticancer Activity of Conjugates of MDP with Amino-Acridine/Acridone Derivatives — Gozdowska M., Dzierzbicka K., Wysocka-Skrzela B. and Kolodziejczyk A.M.
774 Synthesis of o-Aminonitriles of Indeno[2,1-b]pyrrole and Indeno[2,1-c]pyridine
— Geies A.A.
779 Structural Consequences of N...O Interactions in Organic Crystals — Wozniak K.
792 New Derivatives of 3-Amino-2(1H)-thioxo-4(3H)-quinazolinone. Part II. Reaction of 3-Amino-2(1H)-thioxo-4(3H)-quinazolinone with Cyanogen Bromide — Nawrocka W. and Stasko J.J.
PHYSICAL CHEMISTRY
797 Quenching of the Fluorescence of Naphthalene Derivatives by Nucleic Acid Components — Wenska G.
807 The Photoreactivity of p-Chloroaniline — Szczepanik B. and Latowski T.
816 Electrochemical and Spectral Properties of Phenylhydrazine in the Presence of ß-Cyclodextrin — Nie M.Y., Wang Y. and Li H.L.
823 Tristimulus Colorimetry of Bis(2,2'-bipyridyl)bis-Cyanoiron(II) Complex in Organic Solvents — Tlaczala T.
831 Kinetics and Mechanism of Acid Catalysis in the Mutarotation Reaction of N-(p-chlorophenyl)-ß-D-glucopyranosylamine in Methanolic Benzoate Buffer Solutions — Smiataczowa K., Maj K. and Korewa R.
COMMUNICATIONS
840 Thermodynamic Parameters Characterizing Tris(8-Hydroxyquinolinate) Chelate Complex of Iron(III) in the Two-Phase Water-Nitrobenzene Extraction System — Makrlik E. and Vanura P.
844 A Change of Crystallization Pathway from D2O Solution. The Structure of {[Co(en)3]I2 D2O}2(C2O4) (I) — Myrczek J.
ERRATA
848 Protonation and Sulfonation of 2,7-Dimethoxynaphthalene (2,7-DMON) — Cisak A. and Kusztal D.


ABSTRACTS

695-700

New Weakly Ferromagnetic Coupling Dicopper(II),
Antiferromagnetic Dinickel(II) and Dicobalt(II)
Complexes with 1,8-Naphthalato as Bridging Ligand:
Synthesis Spectrum and Magnetism

by J. Gao1, S.L. Ma1, Ch.Y. Jin1 and D.Z. Liao2
1Department of Food Engineering, Tianjin University of Commerce, Tianjin, 300400, P. R. of China 2Department of Chemistry, Nankai University, Tianjin, 300071, P.R. of China

(Received August 8th, 1996; revised manuscript October 25th, 1996)

New copper(II), nickel(II) and cobalt(II) binuclear complexes have been synthesized, namely [M2(NAPH)(L)4](ClO4)2, M = Cu, Ni and Co; L = phen (1,10-phenanthroline) and bpy (2,2'-bipyridyl), while NAPH denotes 1,8-naphthalate dianion. Magnetic susceptibility measurements in the temperature range 4.2-300 K demonstrated a ferromagnetic interaction between two copper(II) ions in Cu-Cu complex, and weak antiferromagnetic interaction between the two metal ions in Ni-Ni and Co-Co complexes. Based on spin Hamiltonian operator, H = -JS1S2 (S1 = S2 = 1/2, S1 = S2 = 1 or S1 = S2 = 3/2), the singlet-triplet energy gap, J was found to be equal to +0.56 cm-1, -0.48 cm-1, -0.90 cm-1 for the Cu-Cu, Ni-Ni and Co-Co complex, respectively.

701-704

The CdSe-Ga2Se3-GeSe2 System at 870 K

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

(Received August 6th, 1996; revised manuscript December 5th, 1996)

The quasiternary CdSe-Ga2Se3-GeSe2 system at 870 K was investigated using X-ray phase and microstructural methods of analysis. Wide regions of solid solutions of CdSe and Ga2Se3 and the isothermal intersection were established. Quaternary compounds were not found.

705-711

Mixed Thiocyanato-Thione Rhenium(V) Complexes

by M.M. Mashaly and M. El-Behairy
Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt

(Received October 9th, 1996; revised manuscript December 12th, 1996)

New rhenium(V) complexes were prepared by reaction of a 1:1 mixture of KSCN and 2-benzimidazolethione, (L), or 2-benzoxazolethione, (L'), with H2[ReOCl5]. Although the possible sites of coordination for the two ligands are different, identical mixed thiocyanato-thione complexes were obtained. In 6 N HCl, the complexes have the formula [ReOL(or L')(SCN)2Cl(OH2)]· H2O, but in 9 N HCl the complexes have the formula [ReOL(or L')(SCN)Cl2(OH2)]. The electronic absorption spectra and the magnetic moments prove octahedral configuration, IR and conductivity measurements combined with thermal analyses show that the organic ligands behave as neutral monodentate ligands and the thiocyanate anion as a monodentate monoanionic ligand in respect to the metal atom.

712-715

X-ray Investigation of the
Li-Ag-{Si,Ge} Systems at 470 K

by D.G. Kevorkov, V.V. Pavlyuk and O.I. Bodak
Department of Inorganic Chemistry, Ivan Franko Lviv State University,
Kyryla i Mefodia str. 6, 290026, Lviv, Ukraine

(Received November 5th, 1996; revised manuscript January 11th, 1997)

Isothermal sections of the phase diagrams of the Li-Ag-{Si,Ge} systems at 470 K have been investigated by X-ray methods. Three ternary compounds Li3Ag2Si3, LiAg2Si and Li2AgSi2 were found in the Li-Ag-Si system and three ternary compounds Li3Ag2Ge3, Li3Ag3Ge2 and LiAg2Ge were found in the Li-Ag-Ge system.

716-720

Technology and Crystal Structure of the Tl3PbI5
Monocrystals and Some Their Physical Properties

by I.D. Olekseyuk, H.Ye. Davydyuk, A.A. Fedonyuk,
L.V. Sysa and A.M. Padalko
Laboratory of Chemistry and Physics of Solid State, Volyn' State University,
Voli av. 13, 263009 Lutsk, Ukraine

(Received June 12th, 1996; revised manuscript January 24th, 1997)

The growth technology of Tl3PbI5 consits of two parts. In the first, binary halogenides of lead and thallium are synthesized. In the second, Tl3PbI5 is synthesized with these halogenides and further the monocrystals Tl3PbI5 are grown by Bridgman-Stockbarger method. The sizes of these crystals are 16 x 50 mm. The structure of this compound is suggested to be a Tl3PbBr5-type (space group P212121). Irradiation of the Tl3PbI5 monocrystals by radiation corresponding to absorption maximum, leads to decreasing in time of the absorption in this spectral range. Thus, the process of whiting of the crystals, known for alkaline haloid crystals, is connected with haloid vacancies. Thermal e.m.f. measurements indicated, that photoconductivity is caused by electrons.

721-724

Phase Equilibria of Ag33.3Sn16.7Se50-CdSe Section of the
Quasiternary Ag2Se-CdSe-SnSe2 System

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

(Received August 6th, 1996; revised manuscript January 29th, 1997)

The interaction between components of polythermal Ag33.3Sn16.7Se50-CdSe section of quasiternary Ag2Se-CdSe-SnSe2 system was investigated and its T-x projection was established using differential thermal, X-ray phase, microstructural analysis and microhardness measurements. The Ag2CdSnSe4 compound was found melting incongruently at 908 K and exhibiting orthorhombic structure (space group Cmc21) with lattice constants a = 0.4263(3), b = 0.7372(2), c = 0.6811(2) nm.

725-730

Phase Equilibria in the Section V2O5-Cr2(MoO4)3

by E. Filipek and J. Walczak
Department of Inorganic Chemistry, Technical University of Szczecin,
Al. Piastow 42, 71-065 Szczecin, Poland

(Received January 14th, 1997; revised manuscript March 3rd, 1997)

Differential thermal analysis and X-ray phase analysis have been used to study phase equilibria, established in the section V2O5-Cr2(MoO4)3 over the whole component concentration range up to 1000oC. The results obtained led to a phase diagram for the title section.

731-738

Spectroscopic Study of the Complexation of Iodine with 2,4,6,8-Tetraphenyl-2,4,6,8-tetraazabicyclo[3.3.0]octane

by A. Rouhollahi1, A. Kakanejadifard1, S.M.F. Farnia1 and M. Shamsipur2
1Department of Chemistry, Tehran University, Tehran, Iran
2Department of Chemistry, Razi University, Kermanshah, Iran

(Received December 6th, 1996)

The charge-transfer complex formation between iodine and 2,4,6,8-tetraphenyl-2,4,6,8- tetraazabicyclo[3.3.0]octane (TPTABO) has been studied spectrophotometrically in chloroform solution. The resulting 2:1 complex is formulated as (TPTABO.I+)I3- as it is also characterized by IR and NMR spectroscopy. The formation constant was evaluated from the non-linear least-squares fitting of the absorbance-mole ratio data. The enthalpy and entropy of the complex formation reaction were determined from the temperature dependence of the formation constant. The rate constant and activation parameters Ea, deltaH# and deltaS# were also calculated.

739-746

Reactions of 1-Acylmethylene-3,3-dimethyl-1,3-
-dihydroisobenzofurans with Nucleophiles. Part II [1].
Synthesis of 1,3-Dihydroisobenzofuran Derivatives
with a Functionalized Ethylidene or Allylidene Group

by Z. Wichert-Tur
Institute of Fundamental Chemistry, Technical University of Szczecin,
Al. Piastow 42, 71-065 Szczecin, Poland

(Received June 4th, 1996; revised manuscript January 28th, 1997)

Reaction of 1-formylmethylene-3,3-dimethyl-1,3-dihydroisobenzofuran 1 with primary aromatic or aliphatic amines (derivatives of aniline, cyclohexylamine) gave Schiff bases 2a-g. These compounds reacted with trichloroacetic acid in xylene or toluene to form 1-(2-trichloromethyl-2-arylaminoethylidene)-3,3-dimethyl-1,3-dihydroisobenzo-furans 3a-d. Condensation of 1-formylmethylene derivative 1 with CH-acids led to new, merocyanine dyes 4a-f.

747-753

Isomerization of Di- and Multifunctional
Allyl Compounds Catalyzed by Ruthenium
and Rhodium Complexes

by S. Krompiec1, J. Suwinski1, J. Grobelny2 and P. Wagner1
1Institute of Organic Chemistry and Technology, Silesian Technical University,
Krzywoustego 4, 44-101 Gliwice, Poland
2Institute of Polymer Chemistry, Polish Academy of Sciences,
M. Curie Sklodowskiej 34, 41-800 Zabrze, Poland

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

A method was developed for the isomerization of a series of di- and multifunctional allyl compounds (e.g. triallylamine, diallylamines, N,N-diallylamides, diallylsilanes, tetraallyloxysilane, triallyloxyboron, triallyl ortho-esters, 1,4-di- and 1,3,5-triallyloxybenzene) to the corresponding 1-propenyl derivatives. The catalysts of these reactions were the ruthenium complexes: Ru(CO)3L2, RuCl(H)(CO)L3, RuCl2L3, RuCl2L3 + NaBH4, RuH2L4 and RhH(CO)L3 (L = PPh3). The reactions were usually carried out under mild conditions in solvents or with no solvent. The products of the reactions were found to be (Z)-1-propenyl isomers mainly or almost exclusively, with high or quantitative yields. The ruthenium complexes were not observed to catalyze the isomerization reactions of allyl systems which contain strongly coorrdinating nitrogen atoms not shielded by large groups. The solvents with an active hydrogen atom were found to inhibit the isomerization catalyzed by hydride complexes.

754-756

Synthesis of New Phosphate and Phosphite Esters
of C-lariat Crown Ethers

by G. Schroeder and B. Gierczyk
Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland
E-mail: schroede@chem.amu.edu.pl

(Received January 14th, 1997; revised manuscript February 6th, 1997)

A series of phosphate and phosphite esters of C-lariat crown ethers (12C4, 15C5 and 18C6) and phosphoric esters with podand ether character have been obtained by the reaction of 2-hydroxymethyl crown ethers or diethyleneglycol monomethylether with phosphorous tribromide or phosphorous oxychloride in anhydrous THF.

757-766

Structure of Cyclodextrins and Their Complexes [1].
Part 6. The NMR Observation of Separate Signals
of Host and Guest Pertaining to 1:1 and 1:2 Complexes
of 1,8-Dimethylnaphthalene with ß-Cyclodextrin

by H. Dodziuk1, J. Sitkowski1, L. Stefaniak1,
D. Sybilska2, J. Jurczak1 and K. Chmurski1
1Institute of Organic Chemistry,
2Institute of Physical Chemistry, Polish Academy of Sciences,
01-224 Warsaw, Kasprzaka 44, Poland E-mail: dodziuk@ichf.edu.pl

(Received February 7th, 1997)

1H and 13C NMR spectra of the strong complex of 1,8-dimethylnaphthalene with ß-cyclodextrin, measured in DMF-d7 at low temperatures, exhibit a very unusual behaviour similar to that of the complex with acenaphthene. In addition to the average signals of 1:1 complexed species and those of free guest and host, they exhibit separate signals of 1:2 complex.

767-773

Synthesis and In vitro Anticancer Activity of Conjugates of MDP with Amino-Acridine/Acridone Derivatives

by M. Gozdowska1, K. Dzierzbicka1,
B. Wysocka-Skrzela2 and A.M. Kolodziejczyk1
1Department of Organic Chemistry, Technical University of Gdansk, PL-80-952 Gdansk, Poland
2Department of Drug Technology and Biochemistry, Technical University of Gdansk,
80-952 Gdansk, Poland

(Received November 8th, 1996; revised manuscript February 10th, 1997)

A series of MDP (muramyl dipeptide) analogues modified at the C-terminus of MDP molecule by the formation of an amide bond between the carboxylic group of isoglutamine and the amine function of the respective derivative of acridine or acridone were synthesized as potential anticancer agents.

774-778

Synthesis of o-Aminonitriles
of Indeno[2,1-b]pyrrole and Indeno[2,1-c]pyridine

by A. A. Geies
Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt

(Received November 6th, 1996; revised manuscript February 10th, 1997)

1-Dicyanomethylene-3-indanone (1) reacted with carbon disulfide to give the dithiocarboxylic acid derivative (2) which in turn alkylated with methyl iodide and ethyl chloroacetate to give 3 and 4. Indeno[2,1-c]pyridines 5a,b were prepared through the reaction of 1 with phenyl (benzoyl)isothiocyanate. Bromination of 1 with N-bromosuccinimide afforded 2-bromo derivative 8, which reacted with aniline, methyl thioglycolate, and ethyl glycinate to give indeno[2,1-b]pyrrole and indeno[2,1-b]thiopyrane respectively.

779-791

Structural Consequences of N···O Interactions
in Organic Crystals

by K. Wozniak
Department of Chemistry, The University of Warsaw, ul. Pasteura 1, 02-093 Warszawa, Poland

(Received June 24th, 1996; revised manuscript February 18th, 1997)

Structural consequences of weak inter- and intramolecular attractive N···O interactions in organic crystals are examined in terms of the interatomic distance. Average values of structural parameters in the sub-ranges of the N···O distance and correlation analysis on large data sets reveal correlation between the parameters of the >C-NO2 group and the N···O distance. Factor analysis shows that linear combinations of average values of structural parameters correlate well with the N···O distance. The intramolecular N···O interactions are significantly stronger than their intermolecular counterparts and have more regular structural consequences.

792-796

New Derivatives of 3-Amino-2(1H)-thioxo-4(3H)-
-quinazolinone. Part II.
Reaction of 3-Amino-2(1H)-thioxo-4(3H)-
-quinazolinone with Cyanogen Bromide

by W. Nawrocka and J.J. Stasko
Department of Technology of Drugs, Wroclaw University of Medicine,
50-140 Wroclaw, Pl. Nankiera 1, Poland

(Received November 18th, 1996; revised manuscript February 20th, 1997)

3-Amino-2(1H)-thioxo-4(3H)-quinazolinone was subjected to reactions with bromocyane under different experimental conditions and the following products were obtained:2,2'-thiodi-[3-amino-4(3H)-quinazolinone],2-amino-5-oxo-1,3,4-thiadiazol- -[2,3-b]quinazoline and 1,2-bis[3-thioxo-4(3H)-oxo-quinazoline]guanidine. 2-Amino׫-oxo-1,3,4-thiadiazol[2,3-b]quinazoline was condensed with selected alpha,ß-unsaturatedaldehydes:crotonicandcinnamictoyield3-methyl-3(5-oxo-1,3,4-thiadiazol-
-[2,3-b]-quinazolin-2-ylamino)-propanal-1and2-cinnamylidenoamino-5-oxo-1,3,4-
-thiadiazol-[2,3-b]-quinazoline.

797-806

Quenching of the Fluorescence of Naphthalene
Derivatives by Nucleic Acid Components

by G. Wenska
Faculty of Chemistry, A. Mickiewicz University, 60-780 Poznan, Poland

(Received December 13th, 1996)

Interactions of two fluorescent pesticides: N-methyl 1-naphthylcarbamate (carbaryl) and N,N-diethyl-2-(1-naphthoxy)propionamide (naproamide), as well as 1-methoxynaphthalene, with nucleic acids components were investigated in aqueous solution (phosphate buffer, pH 6.5) and in DMSO by UV absorption, steady-state and time-resolved fluorescence spectroscopy. As follows from the Stern-Volmer plots constructed on the basis of the intensity and lifetime measurements, nucleosides and nucleotides quench fluorescence of the naphthalene derivatives. Quenching was mainly a dynamic process. Bimolecular quenching rate constants kq, determined from lifetime measurements, were in the range of (1.3-6.0) x 109M-1s-1 in aqueous solution and approximately one order of magnitude lower in DMSO kq(less or equal to 0.02-0.9) x 109 M-1 s-1. The mechanism of the dynamic fluorescence quenching in both solvents was discussed in terms of an excited state electron transfer. The ground state complexation of the naphthalene derivatives and nucleic acid components, responsible for a static quenching, was characterized by rather low values of association constants (Ks < 17 M-1) in aqueous solution and the process was negligible in DMSO (Ks > 4 M-1). The fluorescence study indicated a weak affinity of N,N-diethyl-2-(1-naphthoxy)propionamide pesticide to calf thymus DNA.

807-815

The Photoreactivity of p-Chloroaniline

by B. Szczepanik and T. Latowski
Institute of Chemistry, Pedagogical University, Checinska 5, 25-020 Kielce, Poland

(Received November 4th, 1996; revised manuscript January 13th, 1997)

p-Chloroaniline (pCA) shows the highest photoreactivity among all isomers of haloanilines. For the elucidation of complex mechanism of pCA photolysis the identification of final products was performed, and the influence of the medium on absorption, fluorescence and products formation was studied. Benzidine was identified besides aniline among the secondary photoproducts. This fact suggests the formation of 4-imi-
nocyclohexa-2,5-dienylidene as transient species.

816-822

Electrochemical and Spectral Properties
of Phenylhydrazine in the Presence of ß-Cyclodextrin

by M.Y. Nie1, Y. Wang2 and H.L. Li1
1Chemistry Department of Lanzhou University, Lanzhou, 730000, China
2Modern Physics Department of Lanzhou University, Lanzhou, 730000, China

(Received September 2nd, 1996; revised manuscript January 20th, 1997)

Electrochemical and spectral properties of phenylhydrazine hydrochloride (PH) in aqueous solutions in the presence of ß-cyclodextrin (ß-CD) were investigated. Spectral results indicate, that phenylhydrazine hydrochloride can form a 1:1 inclusion complex with ß-CD in aqueous solutions. The formation constant of this complex Kf = 118 M-1 was evaluated by UV spectrometric method. It is observed, that light and oxygen sensitivity of the inclusion complex is much lower than that of the uncomplexed PH, which can be used to improve its storage and handling and will widen its applications in pharmaceutical industry. In addition, it is found that its electrochemical oxidability in aqueous solutions can be greatly suppressed in the presence of ß-CD, whose reasons are discussed. For strongly adsorbed PH on glassy carbon electrode, the formation constant cannot be determined by voltammetric methods.

823-830

Tristimulus Colorimetry of
Bis(2,2'-bipyridyl)bis-Cyanoiron(II)
Complex in Organic Solvents

by T. Tlaczala
Institute of Inorganic Chemistry and Metallurgy of Rare Elements,
Technical University of Wroclaw, 50-370 Wroclaw, Poland

(Received November 13th, 1996; revised manuscript February 3rd, 1997)

The tristimulus colorimetry has been applied to the study of color changes of Fe(bipy)2(CN)2 complex in organic solvents. Colors of solutions are reported in this study in CIE and CIELAB color space. The calculation of chromaticity coordinates has been carried out on the basis of absorption spectra. The color parameters of a solvato-chromic complex enable to connect the overall spectroscopic changes, which are observed in the absorption spectra, with the properties of the solvents, especially with some acidity parameters of solvents (AN, ET, Z).

831-839

Kinetics and Mechanism of Acid Catalysis
in the Mutarotation Reaction of
N-(p-chlorophenyl)-ß-D-glucopyranosylamine
in Methanolic Benzoate Buffer Solutions

by K. Smiataczowa, K. Maj and R. Korewa
Faculty of Chemistry, Uniwersity of Gdansk, 80-952 Gdansk, Poland

(Received January 21st, 1997; revised manuscript March 3rd, 1997)

Rate constants of the mutarotation reaction of N-(p-chlorophenyl)-ß-D-glucopyranosylamine have been determined in methanolic benzoate buffer solutions of various benzoic acid/sodium benzoate molar concentration ratios, at 25oC. The measurements were repeated in solutions of the same composition at fixed ionic strength. Catalytic constants of the hydrogen ions, kH, and of benzoic acid molecules, kHA, have been determined. In the pH range of approx. 7 to 10.5, the reaction has been found to obey the general acid catalysis scheme.

840-843

Thermodynamic Parameters Characterizing
Tris(8-Hydroxyquinolinate) Chelate Complex
of Iron(III) in the Two-Phase
Water-Nitrobenzene Extraction System

by E. Makrlik1 and P. Vanura2
1Department of Chemistry, Charles University, Faculty of Education,
M.D. Rettigove 4, 116 39 Prague 1, Czech Republic
2Department of Analytical Chemistry, Prague Institute of Chemical Technology,
Technicka 5, 166 28 Prague 6, Czech Republic

(Received December 10th, 1996)

844-847

A Change of Crystallization Pathway from D2O Solution.
The structure of {[Co(en)3]I2·D2O}2(C2O4) (I)

by J. Myrczek
Technical University of Lodz, Branch in Bielsko-Biala, Willowa 2, 43-309 Bielsko-Biala, Poland

(Received October 2nd, 1996; revised manuscript February 2nd, 1997)

848

ERRATA: Protonation and Sulfonation of 2,7-Dimethoxynaphthalene (2,7-DMON)

by A. Cisak and D. Kusztal
[Vol. 71, 40-47 (1997)]

page 40, line 7
2,7-DMON-1,3-disulfonic acid should be replaced by
2,7-DMON-3,6-disulfonic acid


Return to main page.


© 1997 Polish Journal of Chemistry
(prepared by aws)