[en] Rare earth nitrate and chloride complexes with 18-crawn-6 in the medium of polar organic solvents have been synthesized. The physicochemical properties as well as the influence of rare earth character and lanthanide salt anion on the compostion and properties of the compounds prepared have been studied. It is established that complexes of metal:ligand=1:1 composition are formed independently on synthesis conditions. Anion has an affect on the degree of hydration of the complexes prepared as well as on their therm0l stability. Thermal investigations have been carried out and ways of complex thermodestruction have been determined

[en] Short note

[en] With 94-95% yield the adducts of Ln tris-pivaloyltriofluoroacetonates with crown-ethers of the composition Ln(PTA)₃x18-crown-6 (Ln=La, Nd, Tb, Er, Lu) and Ln(PTA)₃ x dibenzo-18-crown-6(Ln=Nd, Tb, Er) are synthesized. The compounds obtained are studied by the methods of element analysis, UV and IR spectroscopy, ESR and mass spectroscopy. On the basis of physico-chemical properties and studied spectra the conclusion has been drawn that the interaction of Ln tris-β-diketonates with crown-ethers proceeds along the way of substitution of crown ether in lanthanide coordination sphere for water

[en] Complexes of tetrakis - trifluoroacetylacetonates of rare earths of the general formular Na[Ln(TFA)₄] have been synthesized. The compounds prepared are studied using the methods of element analysis, UV, IR spectroscopy, mass-spectrometry. On the basis of physicochemical properties and thermogravimetric studies conclusions are made on thermal stability of the compounds prepared

[en] By the method of PMR spectroscopy the composition and stabilty of adducts of some RE tris-pivaloyltrifluoroacetonates (Ln(PTA)₃) with 18-crown-h(S) and dibenzo-18-crown 6(S₁), are studied and the shifting capacity of RE tris-β-diketonates n respect to investigated molecules - substrates. It is shown that in case of tris-β-diketonate concentration ratio to concentaration of polyether higher than unit in a solution present is the adduct of 1:1 composition. Stability constants of Nd(PTA)₃xS, Er(PTA)₃xS and Nd(PTA)₃xS₁ are equal respectively 5, 7 and 19. Directions of proton signal paramagnetic shifts in an adduct depends on RE character, the La and Nd compounds shift the signals into the fields with higher intensity of the magnetic field and the Lu(3) compounds - with lower intensity

[en] The generalized data about synthesis and some physicochemical properties of fluorinated β-diketonates of rare-earth elements and yttrium are presented. Chelate compounds of rare-earth elements such as thris-chelates, tetrakis-chelates and adducts with crown ethers are considered. Comparison-property correlation for some complexes are determined. From the data of complex thermal analysis discussion is carried on such characteristics as volatility and thermostability in the same conditions. We obtained P-T dependence on tetrakis-chelates of Na[M(PTA)₄], where PTA pivaloyltrifluoroacetonate-ion, M=Pr, Tb, Y

No abstract available

[en] It was established by ¹H and ¹⁹F NMR that different-ligand complexes in a stoichiometric ratio of 2:1, which exist as ion pairs, are formed in the reaction of the trispivaloyltrifluoroacetonates of the lightest lanthanides with the macrocyclic polyether 18-crown-6 in solution. Analysis of the paramagnetic lanthanide-induced shifts in the NMR spectra indicates similarity in the geometric structures of the complexes. From the data from relaxation NMR spectroscopy it is concluded that the molecule of the macrocyclic polyether enters the first coordination sphere of the lanthanide ion in the cations of the ion pairs

[en] Interaction of hydrated complexes of tris-β-diketonates of yttrium subgroup lanthanides with macrocyclic polyether 18-crown-6 was investigated according to the data of ¹H NMR and NMR relaxation spectroscopy (RS). Formation of complexes with different ligands of 1:1 stoichiometric relation with 17±4M^-1 complexing constants was established. Quantitative analysis of lanthanide-induced shift on ¹H nuclei of formed complexes was used to determine that the last ones were isostructural. Entering of 18-crown-6 molecule into the composition of coordination sphere of lanthanide ion was concluded according to RS NMR data

[en] Short note