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.

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.

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.

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.

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.

The interaction between components of polythermal Ag_33.3Sn_16.7Se₅₀-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.

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 1000^oC. The results obtained led to a phase diagram for the title section.

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 E_a, deltaH^# and deltaS^# were also calculated.

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.

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.

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.

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.

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.

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.

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.

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.

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 k_q, 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 k_q(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 (K_s < 17 M^-1) in aqueous solution and the process was negligible in DMSO (K_s > 4 M^-1). The fluorescence study indicated a weak affinity of N,N-diethyl-2-(1-naphthoxy)propionamide pesticide to calf thymus DNA.

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.

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 K_f = 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.

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, E_T, Z).

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 25^oC. The measurements were repeated in solutions of the same composition at fixed ionic strength. Catalytic constants of the hydrogen ions, k_H, and of benzoic acid molecules, k_HA, 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.

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