D. Czakis-Sulikowska

Thermal and Other Properties of New 4,4'-bipyridine-trichloroacetato Complexes of Mn(II), Ni(II) and Zn(II)

AbstractNew mixed-ligand complexes of general formulae Mn(4-bpy)(CCl3COO)2⋅H2O, Ni(4-bpy)2(CCl3COO)2⋅2H2O and Zn(4-bpy)2(CCl3COO)2⋅2H2O (where 4-bpy=4,4’-bipyridine) were obtained and characterized. The IR spectra, conductivity measurements and other physical properties of these compounds were discussed. The central atoms M(II) form coordinate bonds with title ligands. The thermal behaviour of the synthesized complexes was studied in air. During heating the complexes decompose via different intermediate products to Mn3O4, NiO and ZnO; partial volatilization of ZnCl2was observed. A coupled TG-MS system was used to the analysis of the principal volatile thermal decomposition products of Mn(II) and Ni(II) complexes. The principal volatile mass fragments correspond to: H2O+, OH+, CO+2, HCl+, Cl+2, CCl+ and other.

Synthesis, structural characterisation and thermal decomposition studies of some 2,4′-bipyridyl complexes with cobalt(II), nickel(II) and copper(II)

Abstract2,4′-Bipyridyl (2,4′-bipy orL) complexes with cobalt(II), nickel(II) and copper(II) of the formulae M(2,4′-bipy)2(CH3COO)2·2H2O (M(II) = Co, Ni, Cu), Co(2,4′-bipy)2SO4·3H2O or Ni(2,4′-bipy)2SO4·4H2O have been prepared and their IR and electronic (VIS) spectra are discussed. The thermal behaviour of the obtained compounds has also been studied. The intermediate products of decomposition at different temperatures have been characterized by chemical analysis and X-ray diffraction.

2,4′-Bipyridyl complexes with cobalt(II) and nickel(II)

SummaryComplexes of empirical formulae [ML2Cl2(OH2)2], [CoL2Br2(OH2)2]L·4H2O, [NiL2Br2(OH2)2]L2·2H2O, [ML2(OH2)4]L2(NO3)2 and [ML4(OH2)2](ClO4)2·2H2O (M = CoII, NiII, L = 2,4′-bipyridyl) were synthesized and characterized by elemental and spectral analyses. The thermal decomposition of the complexes was also investigated.

2,4′-Bipyridyl complexes with silver(I) and copper(II)

SummaryAgI and CuII complexes with 2,4′-bipyridyl (2,4′-bipy or L) with the general formulae AgL2X (where X = NOinf3sup−or ClO4-), CuL2X2·2H2O (X = Cl- or Br-), CuL4SO4·4H2O, CuL4(NO3)2·2H2O and CuL4(ClO4)2·H2O have been isolated pure and characterized by analytical, spectral and magnetic measurements. The thermal decomposition of these complexes was studied under non-isothermal conditions in air.

Solvent Extraction of Heavy Lanthanides(III) with 5,7‐Dibromo‐8‐hydroxyquinoline from Aqueous Perchlorate Solution

Abstract The extraction of Tb(III), Dy(III), Ho(III), Er(III), Tm(III), and Yb(III) with 5,7‐dibromo‐8‐hydroxyquinoline (Hdbq or HA) in chloroform from aqueous perchlorate solutions was investigated. The formation of the LnA3 species (where Ln = Tb, Dy, Ho, Er, Tm, and Yb) in the organic phase was supported by the data. The parameters of the extraction processes were determined, and the separation factors between two adjacent lanthanides(III) were calculated.

Solvent extraction of lanthanide ions with 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP)

AbstractThe solvent extraction of Er(III), Yb(III) and Lu(III) by 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP or HL) in carbon tetrachloride has been studied as a function of thepH of the aqueous phase and the concentration of the extractant in the organic phase. The equation for the extraction reaction has been suggested as:

Synthesis and properties of 2,2′-dipyridyl and 4,4′-dipyridyl complexes with thulium salts

Ln^{3 + } + 3HL_{(0)} \rightleftharpoons LnL_{3(0)} + 3H^ + \left( {Ln^{3 + } = Er,Yb, Lu} \right)

Solvent extraction of lanthanide ions with 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP), II. Extraction of erbium(III), ytterbium(III) and lutetium(III) by HPMBP from aqueous-methanol solutions

The extraction equilibrium constants (Kex) and two-phase stability constants (β3x) for theLnL3 complexes have been evaluated.ZusammenfassungDie Extraktion von Er(III), Yb(III) und Lu(III) mittels 1-Phenyl-3-methyl-4-benzoyl-pyrazolon-5 (HPMBP oder HL) in Kohlenstofftetrachlorid aus wäßriger Phase in Abhängigkeit vompH der wäßrigen Phase sowie von der Konzentration von HPMBP in der organischen Phase wurde untersucht. Die folgende Gleichung beschreibt die Extraktionsreaktion: